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# CheckLibClang.cmake - Helper function to test if libclang works
#
# This module provides a function to test if libclang can be compiled and linked
# with the given compiler flags and libraries.
#
# Usage:
# check_libclang_works(<result_var>
# CFLAGS <cflags>
# INCLUDES <includes>
# LINK_DIRS <link_dirs>
# LIBRARIES <libraries>)
#
# Arguments:
# result_var - Variable name to store the result (TRUE/FALSE)
# CFLAGS - Compiler flags to use (can be a list or string)
# INCLUDES - Include directories (list)
# LINK_DIRS - Link directories (list)
# LIBRARIES - Libraries to link (list or string)
#
# Example:
# check_libclang_works(LIBCLANG_WORKS
# CFLAGS "${LLVM_DEFINITIONS}"
# INCLUDES "${LLVM_INCLUDE_DIRS};${CLANG_INCLUDE_DIRS}"
# LINK_DIRS "${LLVM_LIBRARY_DIRS}"
# LIBRARIES "${LIBCLANG_LIBS}")
include(CheckCSourceCompiles)
function(check_libclang_works result_var)
# Parse arguments
set(options "")
set(oneValueArgs "")
set(multiValueArgs CFLAGS INCLUDES LINK_DIRS LIBRARIES)
cmake_parse_arguments(ARG "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
# Save current CMAKE_REQUIRED_* variables
set(_SAVED_CMAKE_REQUIRED_LIBRARIES "${CMAKE_REQUIRED_LIBRARIES}")
set(_SAVED_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
set(_SAVED_CMAKE_REQUIRED_INCLUDES "${CMAKE_REQUIRED_INCLUDES}")
set(_SAVED_CMAKE_REQUIRED_LINK_DIRECTORIES "${CMAKE_REQUIRED_LINK_DIRECTORIES}")
# Set up test environment
if(ARG_CFLAGS)
set(CMAKE_REQUIRED_FLAGS "${ARG_CFLAGS}")
endif()
if(ARG_INCLUDES)
set(CMAKE_REQUIRED_INCLUDES "${ARG_INCLUDES}")
endif()
if(ARG_LINK_DIRS)
set(CMAKE_REQUIRED_LINK_DIRECTORIES "${ARG_LINK_DIRS}")
endif()
if(ARG_LIBRARIES)
set(CMAKE_REQUIRED_LIBRARIES "${ARG_LIBRARIES}")
endif()
# Test if we can compile and link with libclang
check_c_source_compiles("
#include <clang-c/Index.h>
int main() {
CXIndex idx = clang_createIndex(0, 0);
clang_disposeIndex(idx);
return 0;
}
" _LIBCLANG_COMPILE_TEST)
# Restore CMAKE_REQUIRED_* variables
set(CMAKE_REQUIRED_LIBRARIES "${_SAVED_CMAKE_REQUIRED_LIBRARIES}" PARENT_SCOPE)
set(CMAKE_REQUIRED_FLAGS "${_SAVED_CMAKE_REQUIRED_FLAGS}" PARENT_SCOPE)
set(CMAKE_REQUIRED_INCLUDES "${_SAVED_CMAKE_REQUIRED_INCLUDES}" PARENT_SCOPE)
set(CMAKE_REQUIRED_LINK_DIRECTORIES "${_SAVED_CMAKE_REQUIRED_LINK_DIRECTORIES}" PARENT_SCOPE)
# Return result
set(${result_var} ${_LIBCLANG_COMPILE_TEST} PARENT_SCOPE)
endfunction()
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