CMakeDetermineCompilerId: Add notion of "simulated" id/version

Some compilers try to simulate other compilers as a drop-in replacement
supporting all the same command-line options and predefined preprocessor
macros.  In such cases it will be useful to have CMake load the compiler
information files for the simulated compiler instead of duplicating the
information.  Teach CMakeDetermineCompilerId to extract the simulated
compiler id and version when the compiler id detection provides it.

1 files changed, 9 insertions, 0 deletions

diff --git a/Modules/CMakeCXXCompilerId.cpp.in b/Modules/CMakeCXXCompilerId.cpp.in
index 5e87715..f4a4176 100644
--- a/Modules/CMakeCXXCompilerId.cpp.in
+++ b/Modules/CMakeCXXCompilerId.cpp.in
@@ -199,6 +199,9 @@
    because some compilers will just produce instructions to fill the
    array rather than assigning a pointer to a static array.  */
 char const* info_compiler = "INFO" ":" "compiler[" COMPILER_ID "]";
+#ifdef SIMULATE_ID
+char const* info_simulate = "INFO" ":" "simulate[" SIMULATE_ID "]";
+#endif
 
 @CMAKE_CXX_COMPILER_ID_PLATFORM_CONTENT@
 
@@ -212,6 +215,12 @@ int main(int argc, char* argv[])
 #ifdef COMPILER_VERSION_MAJOR
   require += info_version[argc];
 #endif
+#ifdef SIMULATE_ID
+  require += info_simulate[argc];
+#endif
+#ifdef SIMULATE_VERSION_MAJOR
+  require += info_simulate_version[argc];
+#endif
   (void)argv;
   return require;
 }