Project: Split the compiler id detection into a separate function.

This can be extended with parameters to control the output and re-used
in other contexts.

1 files changed, 99 insertions, 0 deletions

diff --git a/Modules/CMakeCompilerIdDetection.cmake b/Modules/CMakeCompilerIdDetection.cmake
new file mode 100644
index 0000000..eee1337
--- /dev/null
+++ b/Modules/CMakeCompilerIdDetection.cmake
@@ -0,0 +1,99 @@
+
+#=============================================================================
+# Copyright 2014 Stephen Kelly <steveire@gmail.com>
+#
+# Distributed under the OSI-approved BSD License (the "License");
+# see accompanying file Copyright.txt for details.
+#
+# This software is distributed WITHOUT ANY WARRANTY; without even the
+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the License for more information.
+#=============================================================================
+# (To distribute this file outside of CMake, substitute the full
+#  License text for the above reference.)
+
+function(_readFile file)
+  include(${file})
+  get_filename_component(name ${file} NAME_WE)
+  string(REGEX REPLACE "-.*" "" CompilerId ${name})
+  set(_compiler_id_version_compute_${CompilerId} ${_compiler_id_version_compute} PARENT_SCOPE)
+  set(_compiler_id_pp_test_${CompilerId} ${_compiler_id_pp_test} PARENT_SCOPE)
+endfunction()
+
+function(compiler_id_detection outvar lang)
+
+  file(GLOB lang_files
+    "${CMAKE_ROOT}/Modules/Compiler/*-${lang}-DetermineCompiler.cmake")
+
+  if (NOT lang STREQUAL Fortran)
+    file(GLOB non_lang_files
+      "${CMAKE_ROOT}/Modules/Compiler/*-DetermineCompiler.cmake")
+  endif()
+
+  set(files ${lang_files} ${non_lang_files})
+  if (files)
+    foreach(file ${files})
+      _readFile(${file})
+    endforeach()
+
+    set(ordered_compilers
+      # Order is relevant here. For example, compilers which pretend to be
+      # GCC must appear before the actual GCC.
+      Comeau
+      Intel
+      PathScale
+      AppleClang
+      Clang
+      Embarcadero
+      Borland
+      Watcom
+      OpenWatcom
+      SunPro
+      HP
+      Compaq
+      zOS
+      XL
+      VisualAge
+      PGI
+      Cray
+      TI
+      SCO
+      GNU
+      MSVC
+      ADSP
+      IAR
+      MIPSpro)
+
+    set(pp_if "#if")
+    set(CMAKE_${lang}_COMPILER_ID_CONTENT "/* Version number components: V=Version, R=Revision, P=Patch
+   Version date components:   YYYY=Year, MM=Month,   DD=Day  */\n")
+
+    foreach(Id ${ordered_compilers})
+      if (NOT _compiler_id_pp_test_${Id})
+        message(FATAL_ERROR "No preprocessor test for \"${Id}\"")
+      endif()
+      set(id_content "${pp_if} ${_compiler_id_pp_test_${Id}}\n# define COMPILER_ID \"${Id}\"${_compiler_id_version_compute_${Id}}\n")
+      set(CMAKE_${lang}_COMPILER_ID_CONTENT "${CMAKE_${lang}_COMPILER_ID_CONTENT}\n${id_content}")
+      set(pp_if "#elif")
+    endforeach()
+
+    set(platform_compiler_detection "
+/* These compilers are either not known or too old to define an
+  identification macro.  Try to identify the platform and guess that
+  it is the native compiler.  */
+#elif defined(__sgi)
+# define COMPILER_ID \"MIPSpro\"
+
+#elif defined(__hpux) || defined(__hpua)
+# define COMPILER_ID \"HP\"
+
+#else /* unknown compiler */
+# define COMPILER_ID \"\"
+
+#endif")
+
+    set(CMAKE_${lang}_COMPILER_ID_CONTENT "${CMAKE_${lang}_COMPILER_ID_CONTENT}\n${platform_compiler_detection}")
+  endif()
+
+  set(${outvar} ${CMAKE_${lang}_COMPILER_ID_CONTENT} PARENT_SCOPE)
+endfunction()