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https://github.com/reactos/CMake.git
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b8fc8b324d
Compiler INFO strings built at preprocessing time encode information that must appear as a string literal in the resulting binary. We must make sure the strings appear in the final binary no matter what compiler and flags are used. The previous implementation worked in most places but failed with the GNU linker's --gc-sections option which managed to discard the string. Instead we make the program return value depend on an element of the string indexed by a runtime program parameter, which absolutely requires the string to be present.
81 lines
2.0 KiB
C++
81 lines
2.0 KiB
C++
/* This source file must have a .cpp extension so that all C++ compilers
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recognize the extension without flags. Borland does not know .cxx for
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example. */
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#ifndef __cplusplus
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# error "A C compiler has been selected for C++."
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#endif
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#if defined(__COMO__)
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# define COMPILER_ID "Comeau"
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#elif defined(__INTEL_COMPILER) || defined(__ICC)
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# define COMPILER_ID "Intel"
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#elif defined(__BORLANDC__)
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# define COMPILER_ID "Borland"
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#elif defined(__WATCOMC__)
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# define COMPILER_ID "Watcom"
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#elif defined(__SUNPRO_CC)
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# define COMPILER_ID "SunPro"
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#elif defined(__HP_aCC)
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# define COMPILER_ID "HP"
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#elif defined(__DECCXX)
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# define COMPILER_ID "Compaq"
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#elif defined(__IBMCPP__)
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# define COMPILER_ID "VisualAge"
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#elif defined(__PGI)
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# define COMPILER_ID "PGI"
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#elif defined(__GNUC__)
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# define COMPILER_ID "GNU"
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#elif defined(_MSC_VER)
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# define COMPILER_ID "MSVC"
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#elif defined(__ADSPBLACKFIN__) || defined(__ADSPTS__) || defined(__ADSP21000__)
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/* Analog Devices C++ compiler for Blackfin, TigerSHARC and
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SHARC (21000) DSPs */
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# define COMPILER_ID "ADSP"
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#elif defined(_COMPILER_VERSION)
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# define COMPILER_ID "MIPSpro"
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/* This compiler is either not known or is too old to define an
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identification macro. Try to identify the platform and guess that
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it is the native compiler. */
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#elif defined(__sgi)
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# define COMPILER_ID "MIPSpro"
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#elif defined(__hpux) || defined(__hpua)
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# define COMPILER_ID "HP"
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#else /* unknown compiler */
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# define COMPILER_ID ""
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#endif
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/* Construct the string literal in pieces to prevent the source from
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getting matched. Store it in a pointer rather than an array
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because some compilers will just produce instructions to fill the
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array rather than assigning a pointer to a static array. */
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char* info_compiler = "INFO" ":" "compiler[" COMPILER_ID "]";
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@CMAKE_CXX_COMPILER_ID_PLATFORM_CONTENT@
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/*--------------------------------------------------------------------------*/
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int main(int argc, char* argv[])
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{
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int require = 0;
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require += info_compiler[argc];
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require += info_platform[argc];
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(void)argv;
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return require;
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}
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