Commit a27bc0cc authored by Rolf Eike Beer's avatar Rolf Eike Beer Committed by Brad King

Check(Function|Library|Symbol)Exists: make it work if only C++ is enabled

parent 7279f293
Threads-CXX
------------
* The :module:`CheckFunctionExists`, :module:`CheckLibraryExists`, and
:module:`CheckSymbolExists` modules learned to work in environments where
only CXX is enabled.
#ifdef CHECK_FUNCTION_EXISTS
#ifdef __cplusplus
extern "C"
#endif
char CHECK_FUNCTION_EXISTS();
#ifdef __CLASSIC_C__
int main(){
......
......@@ -57,14 +57,26 @@ macro(CHECK_FUNCTION_EXISTS FUNCTION VARIABLE)
else()
set(CHECK_FUNCTION_EXISTS_ADD_INCLUDES)
endif()
if(CMAKE_C_COMPILER_LOADED)
set(_cfe_source ${CMAKE_ROOT}/Modules/CheckFunctionExists.c)
elseif(CMAKE_CXX_COMPILER_LOADED)
set(_cfe_source ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CheckFunctionExists/CheckFunctionExists.cxx)
configure_file(${CMAKE_ROOT}/Modules/CheckFunctionExists.c "${_cfe_source}" COPYONLY)
else()
message(FATAL_ERROR "CHECK_FUNCTION_EXISTS needs either C or CXX language enabled")
endif()
try_compile(${VARIABLE}
${CMAKE_BINARY_DIR}
${CMAKE_ROOT}/Modules/CheckFunctionExists.c
${_cfe_source}
COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
${CHECK_FUNCTION_EXISTS_ADD_LIBRARIES}
CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_FUNCTION_DEFINITIONS}
"${CHECK_FUNCTION_EXISTS_ADD_INCLUDES}"
OUTPUT_VARIABLE OUTPUT)
unset(_cfe_source)
if(${VARIABLE})
set(${VARIABLE} 1 CACHE INTERNAL "Have function ${FUNCTION}")
if(NOT CMAKE_REQUIRED_QUIET)
......
......@@ -53,15 +53,26 @@ macro(CHECK_LIBRARY_EXISTS LIBRARY FUNCTION LOCATION VARIABLE)
set(CHECK_LIBRARY_EXISTS_LIBRARIES
${CHECK_LIBRARY_EXISTS_LIBRARIES} ${CMAKE_REQUIRED_LIBRARIES})
endif()
if(CMAKE_C_COMPILER_LOADED)
set(_cle_source ${CMAKE_ROOT}/Modules/CheckFunctionExists.c)
elseif(CMAKE_CXX_COMPILER_LOADED)
set(_cle_source ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CheckLibraryExists/CheckFunctionExists.cxx)
configure_file(${CMAKE_ROOT}/Modules/CheckFunctionExists.c "${_cle_source}" COPYONLY)
else()
message(FATAL_ERROR "CHECK_FUNCTION_EXISTS needs either C or CXX language enabled")
endif()
try_compile(${VARIABLE}
${CMAKE_BINARY_DIR}
${CMAKE_ROOT}/Modules/CheckFunctionExists.c
${_cle_source}
COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
LINK_LIBRARIES ${CHECK_LIBRARY_EXISTS_LIBRARIES}
CMAKE_FLAGS
-DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_LIBRARY_EXISTS_DEFINITION}
-DLINK_DIRECTORIES:STRING=${LOCATION}
OUTPUT_VARIABLE OUTPUT)
unset(_cle_source)
if(${VARIABLE})
if(NOT CMAKE_REQUIRED_QUIET)
......
......@@ -44,10 +44,14 @@
# (To distribute this file outside of CMake, substitute the full
# License text for the above reference.)
macro(CHECK_SYMBOL_EXISTS SYMBOL FILES VARIABLE)
_CHECK_SYMBOL_EXISTS("${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.c" "${SYMBOL}" "${FILES}" "${VARIABLE}" )
if(CMAKE_C_COMPILER_LOADED)
_CHECK_SYMBOL_EXISTS("${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.c" "${SYMBOL}" "${FILES}" "${VARIABLE}" )
elseif(CMAKE_CXX_COMPILER_LOADED)
_CHECK_SYMBOL_EXISTS("${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.cxx" "${SYMBOL}" "${FILES}" "${VARIABLE}" )
else()
message(FATAL_ERROR "CHECK_SYMBOL_EXISTS needs either C or CXX language enabled")
endif()
endmacro()
macro(_CHECK_SYMBOL_EXISTS SOURCEFILE SYMBOL FILES VARIABLE)
......
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