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Fortran: Fix platform id detection on mingw-w64 

On mingw-w64 the GNU Fortran compiler does not define `__MINGW32__` or
any similar indicator.  Fix `CMAKE_Fortran_PLATFORM_ID` detection in
this case by falling back to preprocessing a `.c` source file even
when the compiler id is already detected.
This commit is contained in:
Melven Roehrig-Zoellner 2016-04-03 23:01:22 +02:00 committed by Brad King
parent 66fa61439d
commit 8c4f100a56
1 changed files with 15 additions and 0 deletions
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15
Modules/CMakeDetermineFortranCompiler.cmake
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@ -209,6 +209,21 @@ if(NOT CMAKE_Fortran_COMPILER_ID_RUN)
endif()
endif()
# Fall back for GNU MINGW, which is not always detected correctly
# (__MINGW32__ is defined for the C language, but perhaps not for Fortran!)
if(CMAKE_Fortran_COMPILER_ID MATCHES "GNU" AND NOT CMAKE_Fortran_PLATFORM_ID)
execute_process(COMMAND ${CMAKE_Fortran_COMPILER} ${CMAKE_Fortran_COMPILER_ID_FLAGS_LIST} -E "${CMAKE_ROOT}/Modules/CMakeTestGNU.c"
OUTPUT_VARIABLE CMAKE_COMPILER_OUTPUT RESULT_VARIABLE CMAKE_COMPILER_RETURN)
if(NOT CMAKE_COMPILER_RETURN)
if(CMAKE_COMPILER_OUTPUT MATCHES "THIS_IS_MINGW")
set(CMAKE_Fortran_PLATFORM_ID "MinGW")
endif()
if(CMAKE_COMPILER_OUTPUT MATCHES "THIS_IS_CYGWIN")
set(CMAKE_Fortran_PLATFORM_ID "Cygwin")
endif()
endif()
endif()
# Set old compiler and platform id variables.
if(CMAKE_Fortran_COMPILER_ID MATCHES "GNU")
set(CMAKE_COMPILER_IS_GNUG77 1)