Squashed 'third_party/eigen/' content from commit 61d72f6
Change-Id: Iccc90fa0b55ab44037f018046d2fcffd90d9d025
git-subtree-dir: third_party/eigen
git-subtree-split: 61d72f6383cfa842868c53e30e087b0258177257
diff --git a/cmake/language_support.cmake b/cmake/language_support.cmake
new file mode 100644
index 0000000..231f7ff
--- /dev/null
+++ b/cmake/language_support.cmake
@@ -0,0 +1,66 @@
+# 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 = ${language}")
+ set(text
+ "project(test NONE)
+ cmake_minimum_required(VERSION 2.8.0)
+ set (CMAKE_Fortran_FLAGS \"${CMAKE_Fortran_FLAGS}\")
+ set (CMAKE_EXE_LINKER_FLAGS \"${CMAKE_EXE_LINKER_FLAGS}\")
+ enable_language(${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 ${CMAKE_COMMAND} . -G "${CMAKE_GENERATOR}"
+ 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}")