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authorBrad King <brad.king@kitware.com>2009-08-24 12:49:35 (GMT)
committerBrad King <brad.king@kitware.com>2009-08-24 12:49:35 (GMT)
commita9be85da2ecd7677d3ba72dc2e279541a32907c2 (patch)
tree10608b982a38df84f665be5bbea49e5a56921c55 /Modules/FortranCInterface.cmake
parent14f7a043e3686a6a2b821e759e391c54f3239479 (diff)
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Create FortranCInterface_VERIFY function
This function builds a simple test project using a combination of Fortran and C (and optionally C++) to verify that the compilers are compatible. The idea is to help projects report very early to users that the compilers specified cannot mix languages.
Diffstat (limited to 'Modules/FortranCInterface.cmake')
-rw-r--r--Modules/FortranCInterface.cmake76
1 files changed, 76 insertions, 0 deletions
diff --git a/Modules/FortranCInterface.cmake b/Modules/FortranCInterface.cmake
index 126b117..3980c56 100644
--- a/Modules/FortranCInterface.cmake
+++ b/Modules/FortranCInterface.cmake
@@ -51,6 +51,18 @@
# macros as the previous example plus preprocessor symbols FC_mysub
# and FC_mymod_my_sub.
#
+# Another function is provided to verify that the Fortran and C/C++
+# compilers work together:
+# FortranCInterface_VERIFY([CXX] [QUIET])
+# It tests whether a simple test executable using Fortran and C (and
+# C++ when the CXX option is given) compiles and links successfully.
+# The result is stored in the cache entry FortranCInterface_VERIFIED_C
+# (or FortranCInterface_VERIFIED_CXX if CXX is given) as a boolean.
+# If the check fails and QUIET is not given the function terminates
+# with a FATAL_ERROR message describing the problem. The purpose of
+# this check is to stop a build early for incompatible compiler
+# combinations.
+#
# FortranCInterface is aware of possible GLOBAL and MODULE manglings
# for many Fortran compilers, but it also provides an interface to
# specify new possible manglings. Set the variables
@@ -183,3 +195,67 @@ ${_desc_${macro}}
# Store the content.
configure_file(${FortranCInterface_SOURCE_DIR}/Macro.h.in ${FILE} @ONLY)
endfunction()
+
+function(FortranCInterface_VERIFY)
+ # Check arguments.
+
+ set(lang C)
+ set(quiet 0)
+ set(verify_cxx 0)
+ foreach(arg ${ARGN})
+ if("${arg}" STREQUAL "QUIET")
+ set(quiet 1)
+ elseif("${arg}" STREQUAL "CXX")
+ set(lang CXX)
+ set(verify_cxx 1)
+ else()
+ message(FATAL_ERROR
+ "FortranCInterface_VERIFY - called with unknown argument:\n ${arg}")
+ endif()
+ endforeach()
+
+ if(NOT CMAKE_${lang}_COMPILER_LOADED)
+ message(FATAL_ERROR
+ "FortranCInterface_VERIFY(${lang}) requires ${lang} to be enabled.")
+ endif()
+
+ # Build the verification project if not yet built.
+ if(NOT DEFINED FortranCInterface_VERIFIED_${lang})
+ set(_desc "Verifying Fortran/${lang} Compiler Compatibility")
+ message(STATUS "${_desc}")
+
+ # Build a sample project which reports symbols.
+ try_compile(FortranCInterface_VERIFY_${lang}_COMPILED
+ ${FortranCInterface_BINARY_DIR}/Verify${lang}
+ ${FortranCInterface_SOURCE_DIR}/Verify
+ VerifyFortranC
+ CMAKE_FLAGS -DVERIFY_CXX=${verify_cxx}
+ OUTPUT_VARIABLE _output)
+ file(WRITE "${FortranCInterface_BINARY_DIR}/Verify${lang}/output.txt" "${_output}")
+
+ # Report results.
+ if(FortranCInterface_VERIFY_${lang}_COMPILED)
+ message(STATUS "${_desc} - Success")
+ file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
+ "${_desc} passed with the following output:\n${_output}\n\n")
+ set(FortranCInterface_VERIFIED_${lang} 1 CACHE INTERNAL "Fortran/${lang} compatibility")
+ else()
+ message(STATUS "${_desc} - Failed")
+ file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
+ "${_desc} failed with the following output:\n${_output}\n\n")
+ set(FortranCInterface_VERIFIED_${lang} 0 CACHE INTERNAL "Fortran/${lang} compatibility")
+ endif()
+ unset(FortranCInterface_VERIFY_${lang}_COMPILED CACHE)
+ endif()
+
+ # Error if compilers are incompatible.
+ if(NOT FortranCInterface_VERIFIED_${lang} AND NOT quiet)
+ file(READ "${FortranCInterface_BINARY_DIR}/Verify${lang}/output.txt" _output)
+ string(REGEX REPLACE "\n" "\n " _output "${_output}")
+ message(FATAL_ERROR
+ "The Fortran compiler:\n ${CMAKE_Fortran_COMPILER}\n"
+ "and the ${lang} compiler:\n ${CMAKE_${lang}_COMPILER}\n"
+ "failed to compile a simple test project using both languages. "
+ "The output was:\n ${_output}")
+ endif()
+endfunction()