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# cmake/modules/language_support.cmake
#
# Temporary additional general language support is contained within this
# file.
# This additional function definition is needed to provide a workaround for
# CMake bug 9220.
# On debian testing (cmake 2.6.2), I get return code zero when calling
# cmake the first time, but cmake crashes when running a second time
# as follows:
#
# -- The Fortran compiler identification is unknown
# CMake Error at /usr/share/cmake-2.6/Modules/CMakeFortranInformation.cmake:7 (GET_FILENAME_COMPONENT):
# get_filename_component called with incorrect number of arguments
# Call Stack (most recent call first):
# CMakeLists.txt:3 (enable_language)
#
# My workaround is to invoke cmake twice. If both return codes are zero,
# it is safe to invoke ENABLE_LANGUAGE(Fortran OPTIONAL)
function(workaround_9220 language language_works)
#message("DEBUG: language = ${language}")
set(text
"project(test NONE)
cmake_minimum_required(VERSION 2.6.0)
enable_language(${language} OPTIONAL)
")
file(REMOVE_RECURSE ${CMAKE_BINARY_DIR}/language_tests/${language})
file(MAKE_DIRECTORY ${CMAKE_BINARY_DIR}/language_tests/${language})
file(WRITE ${CMAKE_BINARY_DIR}/language_tests/${language}/CMakeLists.txt
${text})
execute_process(
COMMAND ${CMAKE_COMMAND} .
WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/language_tests/${language}
RESULT_VARIABLE return_code
OUTPUT_QUIET
ERROR_QUIET
)
if(return_code EQUAL 0)
# Second run
execute_process (
COMMAND ${CMAKE_COMMAND} .
WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/language_tests/${language}
RESULT_VARIABLE return_code
OUTPUT_QUIET
ERROR_QUIET
)
if(return_code EQUAL 0)
set(${language_works} ON PARENT_SCOPE)
else(return_code EQUAL 0)
set(${language_works} OFF PARENT_SCOPE)
endif(return_code EQUAL 0)
else(return_code EQUAL 0)
set(${language_works} OFF PARENT_SCOPE)
endif(return_code EQUAL 0)
endfunction(workaround_9220)
# Temporary tests of the above function.
#workaround_9220(CXX CXX_language_works)
#message("CXX_language_works = ${CXX_language_works}")
#workaround_9220(CXXp CXXp_language_works)
#message("CXXp_language_works = ${CXXp_language_works}")
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