# Distributed under the OSI-approved BSD 3-Clause License. See accompanying | |
# file Copyright.txt or https://cmake.org/licensing for details. | |
#.rst: | |
# CheckCSourceCompiles | |
# -------------------- | |
# | |
# Check if given C source compiles and links into an executable | |
# | |
# CHECK_C_SOURCE_COMPILES(<code> <var> [FAIL_REGEX <fail-regex>]) | |
# | |
# :: | |
# | |
# <code> - source code to try to compile, must define 'main' | |
# <var> - variable to store whether the source code compiled | |
# Will be created as an internal cache variable. | |
# <fail-regex> - fail if test output matches this regex | |
# | |
# The following variables may be set before calling this macro to modify | |
# the way the check is run: | |
# | |
# :: | |
# | |
# CMAKE_REQUIRED_FLAGS = string of compile command line flags | |
# CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar) | |
# CMAKE_REQUIRED_INCLUDES = list of include directories | |
# CMAKE_REQUIRED_LIBRARIES = list of libraries to link | |
# CMAKE_REQUIRED_QUIET = execute quietly without messages | |
macro(CHECK_C_SOURCE_COMPILES SOURCE VAR) | |
if(NOT DEFINED "${VAR}") | |
set(_FAIL_REGEX) | |
set(_key) | |
foreach(arg ${ARGN}) | |
if("${arg}" MATCHES "^(FAIL_REGEX)$") | |
set(_key "${arg}") | |
elseif(_key) | |
list(APPEND _${_key} "${arg}") | |
else() | |
message(FATAL_ERROR "Unknown argument:\n ${arg}\n") | |
endif() | |
endforeach() | |
set(MACRO_CHECK_FUNCTION_DEFINITIONS | |
"-D${VAR} ${CMAKE_REQUIRED_FLAGS}") | |
if(CMAKE_REQUIRED_LIBRARIES) | |
set(CHECK_C_SOURCE_COMPILES_ADD_LIBRARIES | |
LINK_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES}) | |
else() | |
set(CHECK_C_SOURCE_COMPILES_ADD_LIBRARIES) | |
endif() | |
if(CMAKE_REQUIRED_INCLUDES) | |
set(CHECK_C_SOURCE_COMPILES_ADD_INCLUDES | |
"-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}") | |
else() | |
set(CHECK_C_SOURCE_COMPILES_ADD_INCLUDES) | |
endif() | |
file(WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.c" | |
"${SOURCE}\n") | |
if(NOT CMAKE_REQUIRED_QUIET) | |
message(STATUS "Performing Test ${VAR}") | |
endif() | |
try_compile(${VAR} | |
${CMAKE_BINARY_DIR} | |
${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.c | |
COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} | |
${CHECK_C_SOURCE_COMPILES_ADD_LIBRARIES} | |
CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_FUNCTION_DEFINITIONS} | |
"${CHECK_C_SOURCE_COMPILES_ADD_INCLUDES}" | |
OUTPUT_VARIABLE OUTPUT) | |
foreach(_regex ${_FAIL_REGEX}) | |
if("${OUTPUT}" MATCHES "${_regex}") | |
set(${VAR} 0) | |
endif() | |
endforeach() | |
if(${VAR}) | |
set(${VAR} 1 CACHE INTERNAL "Test ${VAR}") | |
if(NOT CMAKE_REQUIRED_QUIET) | |
message(STATUS "Performing Test ${VAR} - Success") | |
endif() | |
file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log | |
"Performing C SOURCE FILE Test ${VAR} succeeded with the following output:\n" | |
"${OUTPUT}\n" | |
"Source file was:\n${SOURCE}\n") | |
else() | |
if(NOT CMAKE_REQUIRED_QUIET) | |
message(STATUS "Performing Test ${VAR} - Failed") | |
endif() | |
set(${VAR} "" CACHE INTERNAL "Test ${VAR}") | |
file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log | |
"Performing C SOURCE FILE Test ${VAR} failed with the following output:\n" | |
"${OUTPUT}\n" | |
"Source file was:\n${SOURCE}\n") | |
endif() | |
endif() | |
endmacro() | |