ENH: Improvied compiler identification robustness

  - Write a single source file into the compiler id directory
  - This avoid requiring the compiler to behave correctly with
    respect to include rules and the current working directory
  - Helps to identify cross-compiling toolchains with unusual
    default behavior

1 files changed, 68 insertions, 0 deletions

diff --git a/Modules/CMakeCXXCompilerId.cpp.in b/Modules/CMakeCXXCompilerId.cpp.in
new file mode 100644
index 0000000..7bdb5e0
--- /dev/null
+++ b/Modules/CMakeCXXCompilerId.cpp.in
@@ -0,0 +1,68 @@
+/* This source file must have a .cpp extension so that all C++ compilers
+   recognize the extension without flags.  Borland does not know .cxx for
+   example.  */
+#ifndef __cplusplus
+# error "A C compiler has been selected for C++."
+#endif
+
+/* Provide main() so the program can link.  */
+int main() { return 0; }
+
+#if defined(__COMO__)
+# define COMPILER_ID "Comeau"
+
+#elif 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_CC)
+# define COMPILER_ID "SunPro"
+
+#elif defined(__HP_aCC)
+# define COMPILER_ID "HP"
+
+#elif defined(__DECCXX)
+# define COMPILER_ID "Compaq"
+
+#elif defined(__IBMCPP__)
+# define COMPILER_ID "VisualAge"
+
+#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"
+
+#elif 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
+
+char info_compiler[] = "INFO:compiler[" COMPILER_ID "]";
+
+@CMAKE_CXX_COMPILER_ID_PLATFORM_CONTENT@