/Intel(R) C++ Compiler 10.1 for Linux* Release Notes/ Contents * Overview * What's New * System Requirements * Installation * Known Issues * Technical Support * Documentation * Additional Information * Disclaimer and Legal Information Overview This product provides tools for Linux* software developers to create C and C++ applications that run at top speeds on IA-32, Intel(R) 64 and IA-64 architecture processors. Optimizations include support for Intel(R) Streaming SIMD Extensions (SSE, SSE2, SSE3 and SSE4) for accelerated integer and floating-point performance. Inter-procedural optimization (IPO) and profile-guided optimization (PGO) can provide greater application performance. Intel(R) compilers support multi-threaded code development through autoparallelism and OpenMP* support. Additional information on the Intel(R) Software Development Products is available at http://www.intel.com/software/products/ . Product Contents This product is available in two editions. The *Standard Edition* contains the following components: * Intel(R) C++ Compiler for IA-32 architecture applications * Intel(R) C++ Compiler for IA-64 architecture applications * Intel(R) C++ Compiler for Intel(R) 64 architecture applications * Substitute headers for use with the Intel C++ Compiler * Intel(R) Assembler for IA-64 architecture applications * Intel(R) Debugger (See separate Release Notes) * Intel(R) C++ compiler integration into Eclipse* and the C/C++ Development Tools* (CDT) (IA-32 and IA-64 architectures only) * Utilities o Intel(R) Compilers code-coverage tool o Intel(R) Compilers test-prioritization tool * On-disk documentation o The documentation index is provided for easy access of all the documents. It is located at |/doc/Doc_Index.htm| The *Professional Edition* includes all of the Standard Edition and adds: * Intel(R) Integrated Performance Primitives - contains audio, video, imaging, cryptography, speech recognition, and signal processing functions and codec component functions for digital media and data-processing applications. * Intel(R) Math Kernel Library - contains highly optimized, extensively threaded, mathematical functions for engineering, scientific, and financial applications that require maximum performance. * Intel(R) Threading Building Blocks - a C++ template-based runtime library that simplifies threading for scalable, multi-core performance. These additional components of the Professional Edition are installed separately and have their own Release Notes. *Note:* The installation path for the Intel(R) C++ Compiler is |/opt/intel/cc/10.1.xxx| , where |xxx| represents a 3-digit update number. The term || is used in throughout this document to refer to the default installation path. To receive technical support and product updates for the tools provided in this product you need to register. For how to register, please see Technical Support section below. Eclipse* Integrated Development Environment (IA-32 and IA-64 Architecture Systems Only) The Intel(R) C++ Compiler for Linux includes compiler integrations for use with either Eclipse*, version 3.3.2, and the C/C++ Development Tools* (CDT), version 4.0.2 or Eclipse*, version 3.2.x, and the C/C++ Development Tools* (CDT), version 3.1.x. Eclipse is an open source software development project dedicated to providing a robust, full-featured, commercial-quality, industry platform for the development of highly integrated tools. It is an extensible, open source Integrated Development Environment (IDE). The CDT (C/C++ Development Tools) project is dedicated to providing a fully functional C/C++ IDE for the Eclipse platform. CDT is layered on Eclipse, and provides a C/C++ development environment perspective. The Intel C++ Compiler integration with the Eclipse/CDT IDE lets you develop, build, and run your Intel C/C++ projects in a visual, interactive environment. * See Also * * http://www.eclipse.org/ for further information about Eclipse * http://www.eclipse.org/cdt/ for further information about CDT What's New in Versions 10.0 and 10.1 The following section discusses new features and changes in the Intel C++ Compiler since version 10.0. Version numbers may not represent a released update - the indicated and later versions have these changes. Please see the separate release notes for the Intel Debugger. Change History 10.1.014 Support added for AES instruction intrinsics for use on a future Intel processor model Information added about future behavior changes || 10.1.013 |-[no-]opt-prefetch-excl-hint| added |-opt-malloc-options| now supported on IA-64 architecture Information about future deprecation of legacy OpenMP libraries added 10.1.012 Corrections to reported problems only 10.1.011 |-mia32| added |-opt-jump-tables| added |-[no-]opt-loadpair| added |-opt-malloc-options=4| value added |-[no-]opt-mod-versioning| added |-[no-]opt-prefetch-initial-values| added |-[no-]opt-prefetch-next-iteration| added |-[no-]unroll-aggressive| now available on IA-64 architecture 10.1.008 First release of 10.1 New and Changed Command Line Options The following is a listing of command line options that are new or have changed since the initial version 9.1 release. Please refer to the compiler documentation for more information on these options. |-alias-const[-]| Determines whether the input/output buffer rule is applied to functions with pointer-type arguments. (Default: off) |-axS| Specifies that the compiler is to generate SSE4 Vectorizing Compiler and Media Accelerators instructions for future Intel processors that support the instructions, as well as generic IA-32 architecture code. (IA-32 and Intel(R) 64 architectures only, default: off) |-[no-]check-uninit| Determines whether run-time checking occurs for uninitialized variables. (Default: off) |-cxxlib-nostd| Prevents the compiler from linking with the standard C++ library. (Default: off) |-diag- | Controls the display of diagnostic information (Default: off) |-diag-dump| Tells the compiler to print all enabled diagnostic messages and stop compilation (Default: off) |-diag-enable port-win | Enables warnings for GNU extensions that may cause errors when porting to Windows. (Default: off) |-diag-enable sv[1|2|3] | Enables the Static Verifier. (Default: off) |-diag-enable sv-include| Specifies that include files should also be considered by the Static Verifier |-diag-file[=file] | Causes the results of diagnostic analysis to be output to a file. (Default: off) |-diag-file-append[=file]| Causes the results of diagnostic analysis to be appended to a file. (Default: off) |-[no-]diag-id-numbers | Tells the compiler to display diagnostic messages by using their ID number values (Default: on) |-dumpmachine| Displays the target machine and operating system configuration and does not compile. (Default: off) |-f[no-]align-functions[=n]| Tells the compiler to align functions on an optimal byte boundary. (IA-32 and Intel(R) 64 architecture only, default: off) |-fargument-noalias-global| Specifies that arguments do not alias each other and do not alias global storage. (Default: off) |-fast| Enables a set of options for improved performance. The options have changed in this release. Please see note below. |-f[no-]exceptions| Enables exception handling table generation (Default: on for C++, off for C) |-f[no-]instrument-functions| Determines whether function entry and exit points are instrumented (Default: off) |-f[no-]jump-tables | Determines whether jump tables are generated for switch statements. (Default: off) |-f[no]-keep-static-consts| Tells the compiler to preserve allocation of variables that are not referenced in the source (Default: off) |-fmudflap| Tells the compiler to instrument risky pointer operations to prevent buffer overflows and invalid heap use (Default: off) |-[no-]fp-port| Tells the compiler to round floating point results to declared precision. This option was on by default in version 9.1 but is off by default in version 10.0 and later. Superseded by |-fp:precise|. (IA-32 and Intel(R) 64 architecture only, default: off) |-fp-speculation=| Tells the compiler the mode in which to speculate on floating-point operations (Default: fast) |-[no-]func-groups | Enables or disables function grouping if profiling information is enabled. (IA-32 and Intel(R) 64 architecture only, default: off) |-gcc-sys| Defines GNU macros only during compilation of system headers. (Default: off) |-help [category]| Displays all available compiler options or a category of compiler options (Default: off) |-[no-]inline-calloc | Tells the compiler to inline calls to |calloc()| as calls to |malloc()| and |memset()|. (Default: off) |-ipo-jobs| Specifies the number of commands (jobs) to be executed simultaneously during the link phase of Interprocedural Optimization (IPO) |-march=core2| Same as -xT. (IA-32 and Intel(R) 64 architecture only) |-mia32| Tells the compiler to generate generic IA-32 architecture code, overriding any different default that the compiler may set. (IA-32 architecture only, default: off) |-msse[n] | Tells the compiler to generate code for certain Intel(R) processors (IA-32 and Intel(R) 64 architecture only, default: off for IA-32, |-msse2 |for Intel(R) 64 architecture) |-mtune=core2| Tells the compiler to choose optimizations that benefit the Inte(R)l Core(TM)2 processor family (IA-32 and Intel(R) 64 architecture only, default: off) |-nostdinc++| Prevents the compiler from searching for header files in the standard directories for C++; causes it to search the other standard directories. (Default: off) |-openmp-lib type| Lets you specify an OpenMP* run-time library to use for linking. See note below <@omplegacy>. (Default: |legacy|) |-[no-]opt-class-analysis| Tells the compiler to use C++ class hierarchy information to analyze and resolve C++ virtual function calls at compile time (Default off) |-opt-jump-tables=default|never|large|| Controls the use of "jump tables" by the compiler. See below for more information. (Default: |default|) |-[no-]opt-loadpair| Enables or disables generation of loadpair code (IA-64 architecture only, default on) |-[no-]opt-mod-versioning| Enables or disables generation of alternate versions of code paths for modulo operations in cases where the modulo is a power of 2. (IA-64 architecture only, default: off) |-opt-malloc-options=n | Lets you specify an alternate algorithm for |malloc()|. (Default: |0|) |-[no-]opt-multi-version-aggressive| Tells the compiler to use aggressive multi-versioning to check for pointer aliasing and scalar replacement. (IA-32 and Intel(R) 64 architecture only, default: off) |-[no-]opt-prefetch-initial-values| Enables or disables prefetch optimization prior to a loop for values which may be used within the first few iterations of the loop. (IA-64 architecture only, default: on) |-[no-]opt-prefetch-issue-excl-hint| Enables or disables use of the "exclusive" hint when generating prefetch instructions. (IA-64 architecture only, default: off) || |-[no-]opt-prefetch-next-iteration| Enables or disables prefetch generation for memory accesses in the next iteration; typically used in a pointer-chasing loop. (IA-64 architecture only, default: on) |-opt-ra-region-strategy [=keyword]| Selects the method that the register allocator uses to partition each routine into regions. (IA-32 and Intel(R) 64 architecture only, default: |default|) |-opt-streaming-stores /keyword/| Enables generation of streaming stores for optimization. (IA-32 and Intel(R) 64 architecture only, default: |auto|) |-[no-]par-runtime-control| Generates code to perform run-time checks for loops that have symbolic loop bounds. (Default: off) |-par-schedule-[[]n]| Specifies a scheduling algorithm for DO loop iterations |-[no-]prefetch| Enables or disables the prefetch insertion optimization. This option is effective only when |-O3| is in effect. Use on IA-32 architecture requires specifying |-xT|. (IA-32 and IA-64 architectures only, default: off) |-save-temps[-]| Tells the compiler to save intermediate files created during compilation (Default: off) |-shared-intel| Causes Intel-provided libraries to be linked in dynamically (Default: all libraries linked statically except |libguide|) |-shared-libgcc| Links the GNU libgcc library dynamically. (Default: off) |-static-intel| Causes Intel-provided libraries to be linked in statically (Default: all libraries linked statically except |libguide|) |-static-libgcc| Links the GNU libgcc library statically. (Default: off) |-tcheck []| Indicates the method of analysis to be performed for OpenMP threaded applications (Default: off) |-tcollect| Inserts instrumentation probes calling the Intel(R) Trace Collector API (Default: off) |-trigraphs| Supports ISO C trigraphs; also enabled in ANSI and C99 modes. (Default: off) |-[no-]unroll-aggressive| Tells the compiler to use aggressive, complete unrolling for loops with small constant trip counts. (default: off) |-[no-]vec-guard-write| Tells the compiler to perform a conditional check in a vectorized loop. (IA-32 and Intel(R) 64 architecture only, default: off) |-Weffc++| Enables warnings based on certain C++ programming guidelines. (Default: off) |-W[no-]missing-declarations| Enables warnings for global functions and variables without prior declaration. (Default: off) |-Wnon-virtual-dtor| Issue a warning when a class appears to be polymorphic, yet it declares a non-virtual one. (Default: off) |-Wreorder | Issue a warning when the order of member initializers does not match the order in which they must be executed. (Default: off) |-W[no-]strict-prototypes| Enables warnings for functions declared or defined without specified argument types. (Default: off) |-Wunused-variable| Enables warnings for functions declared or defined without specified argument types. (Default: off) |-Wwrite-strings| Issues a diagnostic message if |const char *| is converted to (non-const) |char *|. (Default: off) |-xO| Specifies that the compiler is to generate SSE3, SSE2 and SSE instructions and to optimize for the Intel(R) Pentium(R) 4 processor and Intel(R) Xeon(R) processor with SSE3. Generated code should operate on processors not made by Intel that support SSE3, SSE2 and SSE instruction sets, such as some AMD* processors. This value does not enable some optimizations enabled in the S, T, and P processor values. (IA-32 and Intel(R) 64 architectures only, default: off) |-xS| Specifies that the compiler is to generate SSE4 Vectorizing Compiler and Media Accelerators instructions for future Intel processors that support the instructions. The compiler can also generate SSSE3, SSE3, SSE2, and SSE instructions and it can optimize for future Intel processors. (IA-32 and Intel(R) 64 architectures only, default: off) Deprecated and Removed Command Line Options For information on command line options that are either deprecated (still functional but to be removed in a future version) or removed (no longer supported), please refer to the section /Compiler Options/ > /Deprecated and Removed Compiler Options/ in the on-disk documentation. Alternate Command Line Options Many command line options have an older spelling where underscores (?_?) instead of hyphens (?-?) connect the words in the option name. The older spelling is still a valid alternate option name. |-opt-malloc-options=4| In version 10.1.008 the |-opt-malloc-options| compiler option was added. This specifies options to be used for calls to |malloc()| by means of a call to |mallopt()|. In version 10.1.008 the values 0 through 3 were defined. Version 10.1.009 adds a new value 4. The meanings of these values are shown below. For more information, please refer to the documentation for the C library routine |mallopt()|. 0. Tells the compiler to use the default options for malloc(). This is the default. 1. Causes the following adjustments to the malloc() algorithm: M_MMAP_MAX=2 and M_TRIM_THRESHOLD=0x10000000. 2. Causes the following adjustments to the malloc() algorithm: M_MMAP_MAX=2 and M_TRIM_THRESHOLD=0x40000000. 3. Causes the following adjustments to the malloc() algorithm: M_MMAP_MAX=0 and M_TRIM_THRESHOLD=-1. 4. Causes the following adjustments to the malloc() algorithm: M_MMAP_MAX=0, M_TRIM_THRESHOLD=-1, M_TOP_PAD=4096. |-opt-jump-tables=default|never|large| | This option allows user control for the size of jump tables generated by the compiler. Jump tables are used for |switch| constructs, which are implemented either as jump tables or a series of if-then-else constructs. The method used typically has an impact on performance of the generated code, and on the size of the data area. Using jump tables will favor speed over size. The available values are: |default| Let the compiler decide. A jump table, a series of if-then-else constructs, or a combination is generated. The method used depends on factors such as number of cases in the construct and density of the cases. This is the default. |never| Never generate jump tables. Always use if-then-else constructs |large| Generate jump tables up to 65536 entries <|max-entries|> Generate jump tables up to in size Meaning of |-fast| Changed || The |-fast| option is a shorter way of specifying a set of options that generally improve run-time performance. As documented, the set of options may change over time. In version 10.0, |-fast| sets |-xT|, whereas in earlier versions it set |-xP|. If this change is not appropriate for you, you must specify the individual options you want instead of using |-fast|. Please see the Compiler Options section of the on-disk documentation for further information. |-xW| Enabled by Default on Intel(R) 64 Architecture Systems On Intel(R) 64 architecture systems, |-xW| is enabled by default; this has the effect of enabling vectorization and you may see vectorization report messages displayed where you did not when using previous releases. To disable the vectorization report messages, use |-diag-disable vec|. You may still specify alternate options such as |-xP| or| -axT|. Support for gcc* OpenMP* Libraries As of version 10.1 you can specify that OpenMP libraries compatible with gcc* 4.2 (or later) be used by specifying |-openmp-lib compat|. This may be desirable if your application contains some source modules built with gcc or g++ and your application uses OpenMP. The default is |-openmp-lib legacy| which uses the Intel-supplied OpenMP libraries that are not link-compatible with gcc OpenMP libraries. Applications using the |compat| libraries must be built with version 10.0 or later of the Intel C++ and/or Fortran compilers with |-openmp-lib compat| specified. In a future release, the default will change to |-openmp-lib compat|, and in a release after that, the legacy libraries will be removed. New Optimized Exception Handling Implementation This version features a complete new design of exception handling with simpler internal presentation to provide more opportunities for optimization. Improvements include: * Improved inlining in the presence of exception handling * Improved exception handling control flow * Improved optimization opportunities such as constant propagation * Smaller code size * More opportunity for parallelization "Mudflap" Pointer Use Checking "Mudflap" is a pointer user checking technology based on compile-time instrumentation. It adds protective code to a variety of potentially unsafe C/C++ constructs that detect actual erroneous uses at run time. The class of errors detected includes: * NULL pointer dereferencing * Running off the ends of buffers and strings * Leaking memory To enable "Mudflap" pointer use checking, specify the |-fmudflap| compiler option and specify |-lmudflap| in the command which links the application. C++ Class Hierarchy Analysis C++ Class Hierarchy Analysis uses C++ class hierarchy information to provide information to the compiler so that it can resolve more virtual function targets at compile time thus improving performance. New Manual CPU Dispatch /cpuid/ Codes The |cpu_dispatch| and |cpu_specific| keywords now accept the cpuid code |core_2_duo_ssse3| for Intel(R) Core(TM)2 processors and Intel(R) Xeon(R) processors with Supplemental Streaming SIMD Extensions 3 (SSSE3), and the code |core_2_duo_sse4_1| for Intel(R) Core(TM)2 processors and Intel(R) Xeon(R) processors with Streaming SIMD Extensions 4.1 (SSE4.1) Improved Parallelizer and Vectorizer This version features a complete redesign of the optimizer that integrates parallelization (all architectures) and vectorization (IA-32 and Intel(R) 64 architecture) at |O2| and |O3| optimization levels with memory and loop optimizations. Performance can be substantially improved by: * Generation of more efficient multi-threaded code * Generation of more efficient SIMD code * Enhanced loop transformations New and Enhanced Optimization Reports for Advanced Loop Transformations Loop Transformation (HLO) Optimization reports tell you why the compiler was unable to apply loop interchange transformations on a set of loops and suggests loop interchange if the reported bottlenecks can be removed by source changes. These reports have been enhanced to provide more detailed information and to be easier to understand. Behavior Change for |new| Expression with Parenthesized Type In a |new| expression, a parenthesized type followed immediately by an array index is not valid C++. For example: |int main() { char *p1 = new (char *)[20]; // array index is not allowed after ")" return 0; } | In previous versions, the Intel C++ compiler would accept this code and either interpret it as if the array index was part of the type being created: |new ((char*)[20])| or not: |(new (char *))[20] | depending upon the reference compiler and compatibility version target. The compiler has now been changed to always give an error if the compatibility version is gcc 3.4 or later. In gcc 3.3 and earlier compatibility modes the compiler assumes that the array index is part of the type (matching the gcc 3.3 behavior). Behavior Change for |-std=c99| and |-std=c89| When the |-std=c99| or |-std=c89| options are used, the 10.1 compiler's behavior is now compatible with gcc and the |__STRICT_ANSI__| macro is predefined. If your application compiles with errors and you wish to use the previous version's behavior, add |-U__STRICT_ANSI__| to the command line. Intrinsics for Advanced Encryption Standard (AES) Instructions The following functions are used in the algorithmic descriptions of the Advanced Encryption Standard (AES) instruction extensions supported by a future Intel processor. Applications using these intrinsics must ensure that they are running on a processor supporting the AES instructions. * AESDEC * AESDECLAST * AESENC * AESENCLAST * AESIMC, * AESKEYGENASSIST Instruction: |AESDEC xmm1, xmm2/m128| Corresponding Intel(R) C/C++ Compiler Intrinsic: |__m128i _mm_aesdec_si128(__m128i v, __m128i rkey);| Description: Perform one round of an AES decryption flow using the Equivalent Inverse Cipher operating on a 128-bit data (state) from xmm1 with a 128-bit round key from xmm2/m128. Instruction: |AESDECLAST xmm1, xmm2/m128| Corresponding Intel(R) C/C++ Compiler Intrinsic: |__m128i _mm_aesdeclast_si128(__m128i v, __m128i rkey);| Description: Perform the last round of an AES decryption flow using the Equivalent Inverse Cipher operating on a 128-bit data (state) from xmm1 with a 128-bit round key from xmm2/m128. Instruction: |AESENC xmm1, xmm2/m128| Corresponding Intel(R) C/C++ Compiler Intrinsic: |__m128i _mm_aesenc_si128(__m128i v, __m128i rkey);| Description: Perform one round of an AES encryption flow operating on a 128-bit data (state) from xmm1 with a 128-bit round key from xmm2/m128. Instruction: |AESENCLAST xmm1, xmm2/m128| Corresponding Intel(R) C/C++ Compiler Intrinsic: |__m128i _mm_aesenclast_si128(__m128i v, __m128i rkey);| Description: Perform the last round of an AES encryption flow operating on a 128-bit data (state) from xmm1 with a 128-bit round key from xmm2/m128. Instruction: |AESIMC xmm1, xmm2/m128| Corresponding Intel(R) C/C++ Compiler Intrinsic: |__m128i _mm_aesimc_si128(__m128i v);| Description: Perform the InvMixColumn transformation on a 128-bit round key from xmm2/m128 and store the result in xmm1. Instruction: |AESKEYGENASSIST xmm1, xmm2/m128, imm8| Corresponding Intel(R) C/C++ Compiler Intrinsic: |__m128i _mm_aeskeygenassist_si128(__m128i ckey, const int rcon);| Description: Assist in AES round key generation using an 8 bits Round Constant (RCON) specified in the immediate byte operating on 128 bits of data specified in xmm2/m128 and stores the result in xmm1. Instruction: |PCLMULQDQ xmm1, xmm2/m128, imm8| Corresponding Intel(R) C/C++ Compiler Intrinsic: |__m128i _mm_clmulepi64_si128(__m128i v1, __m128i v2, const int imm8);| Description: Carry-less multiplication of one quadword of xmm1 by one quadword of xmm2/m128, stores the 128-bit result in xmm1. The immediate is used to determine which quadwords of xmm1 and xmm2/m128 should be used. Static Verifier Static Verifier is a new compiler feature which performs static analysis of a program across multiple source files. It can detect different kinds of defects and doubtful or inconsistent uses of language features in user code and report them according to their severity level. Static Verifier understands C/C++ and Fortran code and can also perform analysis of OpenMP directives. In this release, when Static Verifier is enabled the linker is not invoked so an executable or static/dynamic link library is not produced, object files that were produced as a result of invocation of Static Verifier are not valid and should not be used for generating of real executable or static/dynamic link libraries. The current usage model is that Static Verifier is added as an alternate build option to produce a diagnostic report. Static Verifier cannot be used in conjunction with cross-file interprocedural optimization (/Qipo). For more information, please refer to the section on Building Applications > Error Handling > Handling Compile Time Errors > using Static Verification Diagnostic Options in the on-disk documentation. Using Static Verifier in the Eclipse* IDE When Static Verifier support is enabled within the IDE, the customary final build target (e.g. an executable image) is not created. As such, we recommend that a separate "Static Verification" configuration be created, by cloning the existing Debug (development) configuration, for use when static verification is desired. * Open the property pages for the project and select "C/C++ Build". * Click the "Manage?" button * In the "Manage" dialog, click the "New?" button to open the "Create configuration" dialog. * Supply a name for the new configuration in the "Name" box. * Supply a "Description" for the configuration if you want (optional). * You can choose to "Copy settings from" a "Default configuration" or an "Existing configuration" by clicking the appropriate radio button and then selecting a configuration from the corresponding drop down menu. * Click "O.K." to close the "Create configuration" dialog. * Click "O.K." to close the "Manage" dialog (with your new configuration name selected). * The property pages will now be displaying the settings for your new configuration and it is now the active build configuration. * Navigate to the Intel compiler's Compilation Diagnostics properties. Use the "Level of Static Analysis" and "Analyze Included Files" properties to control Static Verification. Provisions for Eclipse* Support The compiler and debugger integrations into Eclipse* and the C/C++ Development Tools* (CDT) are provided for the 10.1 Intel C++ compiler and idb debugger. However, the common Eclipse* base components (the Eclipse* Platform Binary, Eclipse* C/C++ Development Tools* (CDT), and a JRE), which are required by the compiler and debugger integrations, are no longer provided on the compiler kit. Detailed instructions for freely obtaining these common components are provided in the Installation Guide. We have verified the 10.1 Intel integration support with: * Eclipse* version 3.3.2 * C/C++ Development Tools* (CDT) version 4.0.2 * JRockit* 5.0 JRE from BEA Systems Inc and: * Eclipse* version 3.2.1 * C/C++ Development Tools* (CDT) version 3.1.1 * JRockit* 5.0 JRE from BEA Systems Inc For additional information on Eclipse* versions 3.2.1, see: http://archive.eclipse.org/eclipse/downloads/ Eclipse 3.3.2 and CDT 4.0.2 IA-64 Architecture Support: There is no CDT 4.0 support for the IA-64 architecture currently available, due to the fact that there is no Eclipse 3.3 platform support available on the IA-64 architecture, on which CDT 4.0 depends. The Eclipse 3.3 platform support on IA-64 architecture is not available due to the lack of availability of a version 1.6 JVM on IA-64 architecture, which is required to build Eclipse 3.3. The 1.6 JVM support for IA-64 architecture is not expected this calendar year, and without it, Intel will not be able to provide an Intel(R) compiler integration for CDT 4.0 on IA-64 architecture. Intel is monitoring the situation and awaiting the availability of a 1.6 JVM on IA-64 architecture. Documentation for the Eclipse CDT 4.0.2 Intel Compiler Integration: The Intel(R) C/C++ Compiler Getting Started and User?s Guide that accompany the Intel Compiler kit have not been updated with information about the new CDT 4.0.2 integration. Please refer to the Eclipse CDT Users Guide for general help. Toolchain Editing Support in the Eclipse CDT 4.0.2 Intel Compiler Integration: The specification of multiple versions of the Intel C/C++ compiler to build source components in an Intel(R) compiler Eclipse/CDT C/C++ project within a single project configuration is not supported. In addition, replacing a particular version of the Intel C/C++ compiler "toolchain" with another version within a project configuration within Eclipse/CDT is not supported. |libimf| Linking Change on Intel(R) 64 Architecture In some earlier versions of Intel C++ Compiler, applications built for Intel(R) 64 linked by default to the dynamic (shared object) version of |libimf|, even though other libraries were linked statically. In the current version, |libimf| is linked statically unless |-shared-intel| is used. This matches the behavior on IA-32 architecture systems. You should use |-shared-intel| to specify the dynamic Intel libraries if you are linking against shared objects built by Intel compilers. A side effect of this change is that users may see the following message from the linker: |warning: feupdateenv is not implemented and will always fail| This warning is due to a mismatch of library types and can be ignored. The warning will not appear if |-shared-intel| is used. New |-early-template-check| Switch Even though recent versions of g++ (3.4 and newer) parse template definitions, they do very little semantic checking of such definitions. Most of the semantic checking is delayed until an actual instantiation is done. As a result, g++ accepts certain unusable templates provided they are not actually used in the program. A new option is available (|-early-template-check|) to allow Intel C++ users to check the semantics of function template prototypes before instantiation. Example: |class A {}; template struct B { B () {}; // error with -early-template-check): no initializer for // reference member "B::a" A& a; };| Note that this switch will work in gcc 3.4 and later compatibility modes only (i.e. |-gcc-version=340| and later). |-ansi| no longer implies |-fp-port| In previous versions of the compiler, the |-ansi| switch implied -fp-port. In version 10.1, |-ansi |no longer implies |-fp-port|. As a result, the compiler generates more efficient floating-point code under |-ansi|, especially when using x87 instructions to implement FP calculations. Use |-fp-port| in addition to |-ansi| if it is important to round FP data to source precision at assignments and casts. |-cxxlib-icc| no longer supported for C++ This release requires using the GNU g++* C++ libraries when linking C++ applications, rather than those from Dinkumware* supported in previous releases. As a result of this change, this release requires systems with gcc 3.2 or higher installed. Initializing Variables of Type |__m64| in Intel(R) 64 Architecture Applications The |__m64| data type used to be treated as a scalar, at least to the extent of being able to statically initialize |__m64| data with an integer literal. But for compatibility with directions being taken by other compilers supporting MMX(TM), we are dropping support for that feature. As a result, an initializer for a variable of |__m64| type must be enclosed in braces. If your application uses a scalar to initialize such variables, the compiler will give an error message such as: |error: a value of type "unsigned long long" cannot be used to initialize an entity of type "const __m64"| Behavior Changes Planned for Future Compiler Versions This section lists planned behavior changes in a future major release of the Intel(R) C++ Compiler * In a future version, the |-mtune itanium| option will be deprecated. This option specified optimization tuning to favor the original Intel(R) Itanium(R) processor. In the future, this option will cause a diagnostic to be issued and it will be ignored - the default tuning will favor the Intel(R) Itanium(R) 2 processor. * In a future version, the default code generation for the IA-32 architecture will be |-xW|. Intel recommends, if you wish to ensure continued generated code compatibility with earlier processors, that you add the |-mia32| option to your build scripts now. * In a future version, the default OpenMP libraries will be the compat version and not legacy. See Support for gcc OpenMP Libraries above, for more details. System Requirements Processor Terminology Intel(R) compilers support three platforms: general combinations of processor and operating system type. This section explains the terms that Intel uses to describe the platforms in its documentation, installation procedures and support site. *IA-32* IA-32 Architecture refers to systems based on 32-bit processors generally compatible with the Intel Pentium(R) II processor, (for example, Intel(R) Pentium(R) 4 processor or Intel(R) Xeon(R) processor), or processors from other manufacturers supporting the same instruction set, running a 32-bit operating system ("Linux x86"). *Intel(R) 64 * Intel(R) 64 Architecture refers to systems based on IA-32 architecture processors which have 64-bit architectural extensions, (for example, Intel(R) Core(TM)2 processor family), running a 64-bit operating system ("Linux x86_64"). If the system is running a 32-bit version of the Linux operating system, then IA-32 architecture applies instead. Systems based on AMD* processors running a "Linux x86_64" operating system are also supported by Intel compilers for Intel(R) 64 architecture applications. *IA-64* Refers to systems based on the Intel(R) Itanium(R) processor running a 64-bit operating system. Native and Cross-Platform Development The term "native" refers to building an application that will run on the same platform that it was built on, for example, building on IA-32 architecture to run on IA-32 architecture. The term "cross-platform" or "cross-compilation" refers to building an application on a platform type different from the one on which it will be run, for example, building on IA-32 architecture to run on IA-64 architecture. Not all combinations of cross-platform development are supported and some combinations may require installation of optional tools and libraries. The following list describes the supported combinations of compilation host (system on which you build the application) and application target (system on which the application runs). IA-32 Architecture Host Supported target: IA-32 Intel(R) 64 Architecture Host Supported targets: IA-32 and Intel(R) 64 IA-64 Architecture Host Supported target: IA-64 *Note:* Development for a target different from the host may require optional library components to be installed from your Linux Distribution. *Note:* Intel(R) Cluster OpenMP* has different system requirements from that of the compilers. Please refer to the Intel Cluster OpenMP documentation for further details. Requirements to develop IA-32 architecture applications * A system based on an IA-32 architecture processor (minimum 450 MHz Intel Pentium(R) II processor or greater - Intel(R) Core(TM)2 processor family recommended), Intel(R) 64 architecture processor, or a system based on a compatible AMD* processor * 512 MB of RAM (1GB recommended). * 100 MB of disk space, plus an additional 200 MB during installation for the download and temporary files. * One of the following Linux distributions (this is the list of distributions tested by Intel; other distributions may or may not work and are not recommended - please contact Intel(R) Premier Support if you have questions): o Asianux* 3.0 o Debian* 4.0 o Fedora* 7, 8 o Red Hat Enterprise Linux* 3, 4, 5 o SUSE LINUX Enterprise Server* 9, 10 o TurboLinux* 11 o Ubuntu* 7.04, 7.10 * Linux Developer tools component installed, including gcc, g++ and related tools * Linux component |compat-libstdc++| providing |libstdc++.so.5 | Requirements to Develop Applications for Intel(R) 64 Architecture Systems or for AMD* 64-bit Processors * A system based on an IA-32 or Intel(R) 64 architecture processor (Intel(R) Core(TM)2 processor family or Intel(R) Xeon(R) processor recommended), or based on an AMD 64-bit processor * 512 MB of RAM (1GB recommended) * 300 MB free hard disk space, plus an additional 300 MB during installation for download and temporary files. * 100 MB of hard disk space for the virtual memory paging file. Be sure to use at least the minimum amount of virtual memory recommended for the installed distribution of Linux * One of the following Linux distributions (this is the list of distributions tested by Intel; other distributions may or may not work and are not recommended - please contact Intel(R) Premier Support if you have questions): o Asianux* 3.0 o Debian* 4.0 o Fedora* 7, 8 o Red Hat Enterprise Linux* 3, 4, 5 o SGI ProPack* 5 o SUSE LINUX Enterprise Server* 9, 10 o TurboLinux* 11 o Ubuntu* 7.04, 7.10 * Linux Developer tools component installed, including gcc, g++ and related tools * Linux component |compat-libstdc++| providing |libstdc++.so.5| * Linux component containing 32-bit libraries (may be called |ia32-libs|) Requirements to Develop IA-64 Architecture Applications * A system based on an Intel(R) Itanium(R) processor. * 512 MB of RAM (1 GB recommended). * 150 MB of disk space, plus an additional 200 MB during installation for the download and temporary files. * One of the following Linux distributions (this is the list of distributions tested by Intel; other distributions may or may not work and are not recommended - please contact Intel(R) Premier Support if you have questions): o Asianux* 3.0 o Debian* 4.0 o Red Hat Enterprise Linux* 3, 4, 5 o SUSE LINUX Enterprise Server* 9, 10 o TurboLinux* 11 * Linux Developer tools component installed, including gcc, g++ and related tools * Linux component |compat-libstdc++| providing |libstdc++.so.5 | Note on gcc Versions The Intel compilers are tested with a number of different Linux distributions, with different versions of gcc. Some Linux distributions may contain header files different from those we have tested, which may cause problems. The version of glibc you use must be consistent with the version of gcc in use. For best results, use only the gcc versions as supplied with distributions listed above. *Notes:* * Compiling very large source files (several thousands of lines) using advanced optimizations such as |-O3, -ipo| and |-openmp|, may require substantially larger amounts of RAM. * The above lists of processor model names are not exhaustive - other processor models correctly supporting the same instruction set as those listed are expected to work. Please contact Intel(R) Premier Support if you have questions regarding a specific processor model * Some optimization options have restrictions regarding the processor type on which the application is run. Please see the documentation of these options for more information. Use of the Eclipse* Integrated Development Environment on Red Hat Enterprise Linux AS 2.1 has the following additional requirements: * Red Hat AS 2.1 Update 6 * Mozilla* 1.4 Xft or higher (up to 1.7) * For users of the GTK* window system: version 2.2.1 of the GTK+ widget toolkit and associated libraries (GLib, Pango) should be installed. Installation Please see the separate Installation Guide for information on installing the compiler and setting up the compiler environment. The default installation directories, referred to elsewhere in this document as || and ||, are: * |/opt/intel/cc/10.1.xxx| (for IA-32 and IA-64) * |/opt/intel/cce/10.1.xxx| (for Intel(R) 64) * |/opt/intel/idb/10.1.xxx | (for IA-32 and IA-64) * |/opt/intel/idbe/10.1.xxx| (for Intel(R) 64) Known Issues Binary Incompatibility for OpenMP Applications Programs compiled with the Intel Compiler version 9.0 using the |-openmp| switch may not run after installing the Intel Compiler version 10.1. For such programs, the loader may exit at run time with an error message about undefined symbols beginning with the string |_intel| (for example, |_intel_fast_memset|). If this occurs, please recompile the executable using the Intel Compiler version 10.1 and the loader error message should disappear. Header Incompatibility with Red Hat* Enterprise Linux* 3, Update 4 (also SGI* ProPack* 3 Service Pack 5) In Update 4 to Red Hat Enterprise Linux 3, inline assembly code was added to the file |/usr/include/c++/3.2.3/ia64_Red Hat-linux/bits/os_defines.h|. This causes the Intel C++ Compiler to fail to compile sources referencing this header. Note that this problem is not known to exist for any other version of Linux, including earlier versions of EL3 and EL4 or later. This issue also affects SGI ProPack 3 Service Pack 5. A modified header file which corrects this problem is available from http://www.intel.com/software/products/compilers/downloads/os_defines.h.90 A good place to put the modified file is in the substitute headers directory of your installed compiler. For example, |/substitute_headers/c++/bits/os_defines.h|. The path must end with |bits/os_defines.h|. If you place it there the compiler will find it automatically. You should find an existing installer-created directory |/substitute_headers| and should create the sub-directory path |c++/bits| underneath it. |-ipo_obj| option Is no longer supported The |-ipo_obj| option, which forced generation of direct object code, is no longer supported. If the option is specified, a warning is given and the effect is as if |-ip| was specified instead. OpenMP limitations * POSIX* threaded programs that require a large stack size may not run correctly on some versions of Linux because of hard-coded stack size limits in some versions of the Linux POSIX threads libraries. These limits also apply to OpenMP programs (-openmp) and automatically generated parallel programs (|-parallel| ) with the Intel compilers, because the Intel compilers use the POSIX threads library to implement OpenMP based and automatically generated parallelism. Threaded programs that exceed the stack space limit usually experience segmentation violations or addressing errors. To avoid these limitations, use a version of glibc built with the |FLOATING_STACKS| parameter defined. For some distributions, this implies using the shared rather than the static version of the pthreads library. Then use the |ulimit -s| or |limit stacksize| command to set the maximum shell stack size to an explicit large value, in units of KBytes, (not |unlimited|), and also set the |KMP_STACKSIZE| environment variable to the needed thread stacksize in bytes. Note, in the bash shell, |ulimit -s| can be used to set a large maximum stack size only once. In the C shell (csh), |limit stacksize| , with no dash before the argument, can be used to reset the maximum stacksize repeatedly. * It is noted that Linux thread local storage (TLS) is not fully supported by the default installations of |/usr/lib/libpthread.a| and |/usr/lib/libc.a| on certain versions of Linux (Red Hat Enterprise Linux 4 and earlier are known examples). When using the Linux TLS mechanism and linking with |-static|, the inclusion of |-openmp| or calls to |libpthread| may trigger a runtime failure when trying to access thread local storage. To fix this problem, install the |nptl-devel.rpm| package (included on the Linux installation CD) and compile with |-L/usr/lib/nptl|. Compile time slow down when using both |-g| and inlining There will be an increase in compile time when |-g| is used together with inlining. Inlining can happen if the user specifies |-ipo, -ip| or compiles a |C++/C99| program at option levels |-O1| or above. This is due to the generation of debug information. For many applications, this combination of compiler options will not increase compile time or compile-time memory use. Compiler hang on version query on glibc 2.2.4-26 We have identified a problem with glibc version 2.2.4-26 that shipped with the original version of Red Hat AS2.1. This version causes a compiler hang on the command "icc -v or icc -V (with no files to compile). Upgrading to glibc 2.2.4-31.7 fixes the problem. If you have taken any updates to your AS2.1 you will not see this problem. There was also a respin of the original AS2.1 that fixed this problem so only if you have a very early installation of AS2.1 that has never been updated will you see this issue. Incorrect output or miscompare on SPEC* CPU2006* 471.omnetpp on x86_64 systems We have identified a problem with the gcc binutils linker in some Linux distributions for x86_64 (Intel(R) 64 architecture and similar) systems. This problem manifests itself when running the SPEC* CPU2006* benchmark test 471.omnetpp, resulting in incorrect output, and has been reproduced using varying versions of the Intel C++ compiler as well as with gcc. Not all Linux distributions have the affected linker. The Bugzilla reports for this problem are http://sourceware.org/bugzilla/show_bug.cgi?id=2655 and http://sourceware.org/bugzilla/show_bug.cgi?id=2657 Please contact your Linux distributor to find out if your distribution has the affected linker. |-relax| no longer passed to linker on IA-64 architecture systems As of version 10.1, the compiler driver no longer passes the |-relax| switch to the linker on IA-64 architecture systems, as this conflicts with the |-r| option. The -relax option is not needed as it is the default when using binutils 2.11.90.0.27 or later - 2.14 is recommended. If you must use an older binutils and wish to specify the |-relax| option, use |-Xlinker -relax| on the compile command which invokes the linker. |ld| warning about |libunwind.so.7| on SLES 10 When applications are built using the Intel compiler on SUSE LINUX Enterprise Server 10, you may see a warning similar to the following: |ld: warning: libunwind.so.7, needed by /usr/lib/gcc/ia64-suse-linux/4.1.0/../../..//libgcc_s.so, may conflict with libunwind.so.6 | A workaround is to add the following line to |icc.cfg|: |-L /usr/lib | This issue is expected to be resolved in a future release of the Intel compiler. Limited debug information with automatic CPU dispatching |(-ax*|) Compilation using |-ax[code]| results in two copies of generated code for each function. One for IA-32 architecture generic code and one for CPU specific code. The symbol for each function then refers to an Auto CPU Dispatch routine that decides at run-time which one of the generated code sections to execute. Debugger breakpoints that are set on these functions by name cause the application to stop in the dispatch routine. This may cause unexpected behavior when debugging. This issue may be addressed in a future version of the Intel Debugger and Compilers. Cannot debug or view traceback for IA-32 architecture programs built without |-fp | Compilation using |-fp| specifies that the IA-32 architecture EBP register be used as a frame pointer rather than a general purpose register. Debuggers and traceback handlers may not be able to properly unwind through a stack that contains a call to a function that is compiled without |-fp| in effect. If you compile with |-g| or |-O0|, |-fp| is implicitly enabled, but not if you specify a higher optimization level explicitly (such as |-O2|). If you intend to use the debugger or traceback on an application, and are using some level of optimization higher than |-O0|, you should also specify |-fp| to ensure that the debugger and traceback handler can use frame pointers. GNU assembler may not recognize generated code Older versions of the GNU Assembler may not be able to process assembly code generated by compiling with the |-[a]xP|, |T| or |S| options. Use binutils version 2.17.50.0.15 or later if this is an issue for you. Using older |gdb| versions with Intel Compilers Intel compilers for Linux generate Dwarf2-format debugging information, including several advanced features in Dwarf2 such as declarations nested within classes. Older |gdb| debuggers, such as version 5.3.90-*, are sometimes unable to correctly handle these Dwarf features. For best success on source code which uses the full expressiveness of the C++ language, please consider using |gdb| version 6.1 or newer. Use |idb| with Extended Debug Information If you use the |-debug |keywords |inline_debug_info|, |semantic_stepping|, |variable_locations| or |extended|, you should use the Intel Debugger (idb), as other debuggers may not understand the extended information and may behave unpredictably. We are working with the developers of other debuggers towards their adding support for the extended debug information. Technical Support If you did not register your compiler during installation, please do so at the Intel(R) Software Development Products Registration Center . Registration entitles you to free technical support, product updates and upgrades for the duration of the support term. For information about how to find Technical Support, Product Updates, Users Forums, FAQs, tips and tricks, and other support information, please visit: http://www.intel.com/software/products/support/clin . *Note:* If your distributor provides technical support for this product, please contact them for support rather than Intel. Submitting Issues Steps to submit an issue: 1. Go to http://www.intel.com/software/products/support and click on the link for Intel(R) Premier Support. 2. Log in to the site. Note that your username and password are case-sensitive. 3. Click on the "|Go|" button next to the "|Product|" drop-down list. 4. Click on the "|Submit Issue|" link in the left navigation bar. 5. Choose "|Development Environment (tools,SDV,EAP)|" from the "|Product Type|" drop-down list. 6. If this is a software or license-related issue, choose "|Intel(R) C++ Compiler, Linux*|" from the "|Product Name|" drop-down list. 7. Enter your question and complete the fields in the windows that follow to successfully submit the issue. *Note:* Please notify your support representative prior to submitting source code where access needs to be restricted to certain countries to determine if this request can be accommodated. Guidelines for problem report or product suggestion: 1. Describe your difficulty or suggestion. For problem reports please be as specific as possible, so that we may reproduce the problem. For compiler problem reports, please include the compiler options and a small test case if possible. 2. Describe your system configuration information. Get the version of glibc and kernel with following commands: | > uname -a| | > rpm -qa | grep glibc| If you don't have |rpm| installed, use the command below: | > ls /lib/libc*| and copy the information into the corresponding Intel(R) Premier Support fields. Get the Intel C++ Compiler's Package ID with the following commands: | > icc -V | and copy the "Package ID" (e.g. |*l_cc_x_10.1.xxx*|) from the output into the corresponding Intel(R) Premier Support field. Please include any other specific information that may be relevant to helping us to reproduce and address your concern. 3. If you were not able to install the compiler or cannot get the Package ID, enter the filename you downloaded as the package ID. Resolved Issues Please review |_README| (e.g. |l_cc_x_10.1.xxx_README|), available for download from Intel(R) Software Development Products Registration Center Product Downloads, to see which issues have been resolved in the latest version of the compiler. Compiler Error Source Reducer (CESR) Compiler Error Source Reducer (CESR) is a set of utilities which are useful individually or collectively in gathering, reducing, pinpointing, protecting, documenting, and bundling test cases comprised of C/C++ or Fortran source code. It can be helpful if you have a large application for which you want to extract a small test case for submission to Intel(R) Premier Support. CESR can be downloaded from Intel(R) Software Development Products Registration Center Product Downloads. Select your product and in the version dropdown, select CESR. CESR is unsupported and should be considered experimental, but we welcome your feedback on it through Intel(R) Premier Support. CESR requires prior installation of Python * 2.2 or newer. Documentation You can view the Intel compiler and related HTML-based documentation with your Web browser. You should use a Web browser that supports JavaScript (such as Firefox*), so it can which provide full navigation, search, index look-up, and hyperlink capabilities amongst the online help files PDF versions of most manuals are available online at http://developer.intel.com/software/products/compilers/clin/docs/manuals.htm . The documentation is installed in the |/doc| directory. An HTML index document can be found at |/doc/Doc_Index.htm| . /The Intel(R) Debugger Manual/ is provided in HTML form in the Intel(R) Debugger doc directory. For information on the GNU glibc C language library, documentation can be obtained from the Linux OS vendor or from the GNU web site, www.gnu.org . Viewing Manpages The |icc|(1) manpage provides a list of command-line options and related information for the |icc| and |icpc| compiler commands. To display the |icc|(1) manpage, type the following command after you set up your environment by using a source command to execute the |/bin/iccvars.*sh| file: |$ man icc| The |man| command provides single keys or key combinations that let you scroll through the displayed content, search for a string, jump to a location, and perform other functions. For example, type the | *z*| to view the next screen or |*w*| to view the previous screen. To obtain help about the man command, type the |*h*| key; when you are done viewing help, type the |*q*| key to return to the displayed manpage. To search, type |*/*| character followed by the search string (|*/string*|) and press Enter. After viewing the man command text, type |*q*| to return to the shell command prompt. Viewing Documentation The HTML documentation format has been tested to work with web browsers shipped on supported Linux* distributions. PDF versions of the compiler documentation are available at: http://developer.intel.com/software/products/compilers/clin/docs/manuals.htm Additional Information Related Products and Services Information on Intel software development products is available at http://www.intel.com/software/products . Some of the related products include: * The Intel(R) Software College provides training for developers on leading-edge software development technologies. Training consists of online and instructor-led courses covering all Intel architectures, platforms, tools, and technologies. * The Intel(R) VTune(TM) Performance Analyzer enables you to evaluate how your application is utilizing the CPU and helps you determine if there are modifications you can make to improve your application's performance. * The Intel(R) C++ and Fortran Compilers are an important part of making software run at top speeds with full support for the latest Intel processors. * The Intel(R) Performance Library Suite provides a set of routines optimized for various Intel processors. The Intel(R) Math Kernel Library , which provides developers of scientific and engineering software with a set of linear algebra, fast Fourier transforms and vector math functions optimized for the latest Intel processors. 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