CMake/Modules/CMakeCCompilerId.c.in

#ifdef __cplusplus
# error "A C++ compiler has been selected for C."
#endif

#if defined(__18CXX)
# define ID_VOID_MAIN
#endif

#if defined(__INTEL_COMPILER) || defined(__ICC)
# define COMPILER_ID "Intel"

#elif defined(__BORLANDC__)
# define COMPILER_ID "Borland"

#elif defined(__WATCOMC__)
# define COMPILER_ID "Watcom"

#elif defined(__SUNPRO_C)
# define COMPILER_ID "SunPro"

#elif defined(__HP_cc)
# define COMPILER_ID "HP"

#elif defined(__DECC)
# define COMPILER_ID "Compaq"

#elif defined(__IBMC__)
# if defined(__COMPILER_VER__)
#  define COMPILER_ID "zOS"
# elif __IBMC__ >= 800
#  define COMPILER_ID "XL"
# else
#  define COMPILER_ID "VisualAge"
# endif

#elif defined(__PGI)
# define COMPILER_ID "PGI"

#elif defined(__GNUC__)
# define COMPILER_ID "GNU"

#elif defined(_MSC_VER)
# define COMPILER_ID "MSVC"

#elif defined(__ADSPBLACKFIN__) || defined(__ADSPTS__) || defined(__ADSP21000__)
/* Analog Devices C++ compiler for Blackfin, TigerSHARC and
   SHARC (21000) DSPs */
# define COMPILER_ID "ADSP"

/* IAR Systems compiler for embedded systems.
   http://www.iar.com
   Not supported yet by CMake
#elif defined(__IAR_SYSTEMS_ICC__)
# define COMPILER_ID "IAR" */

/* sdcc, the small devices C compiler for embedded systems,
   http://sdcc.sourceforge.net  */
#elif defined(SDCC)
# define COMPILER_ID "SDCC"

#elif defined(_SGI_COMPILER_VERSION) || defined(_COMPILER_VERSION)
# define COMPILER_ID "MIPSpro"

/* This compiler is either not known or is too old to define an
   identification macro.  Try to identify the platform and guess that
   it is the native compiler.  */
#elif defined(__sgi)
# define COMPILER_ID "MIPSpro"

#elif defined(__hpux) || defined(__hpua)
# define COMPILER_ID "HP"

#else /* unknown compiler */
# define COMPILER_ID ""

#endif

/* Construct the string literal in pieces to prevent the source from
   getting matched.  Store it in a pointer rather than an array
   because some compilers will just produce instructions to fill the
   array rather than assigning a pointer to a static array.  */
char* info_compiler = "INFO" ":" "compiler[" COMPILER_ID "]";

@CMAKE_C_COMPILER_ID_PLATFORM_CONTENT@

/*--------------------------------------------------------------------------*/

#ifdef ID_VOID_MAIN
void main() {}
#else
int main(int argc, char* argv[])
{
  int require = 0;
  require += info_compiler[argc];
  require += info_platform[argc];
  (void)argv;
  return require;
}
#endif