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enable_language(C)
cmake_policy(SET CMP0054 NEW)
set (lib_name "${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_STATIC_LIBRARY_PREFIX}lib${CMAKE_STATIC_LIBRARY_SUFFIX}")
if (CMAKE_SYSTEM_NAME STREQUAL "Windows")
if (RunCMake_C_COMPILER_ID STREQUAL "MSVC")
if (CMAKE_SIZEOF_VOID_P EQUAL 4)
set (undef_flag /INCLUDE:_func)
else()
set (undef_flag /INCLUDE:func)
endif()
else()
if (CMAKE_SIZEOF_VOID_P EQUAL 4)
set (undef_flag -u _func)
else()
set (undef_flag -u func)
endif()
endif()
elseif (CMAKE_SYSTEM_NAME STREQUAL "Darwin")
set (undef_flag -u _func)
else()
set (undef_flag -u func)
endif()
set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
try_compile(result ${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/lib.c
COPY_FILE "${lib_name}")
set(CMAKE_TRY_COMPILE_TARGET_TYPE EXECUTABLE)
try_compile(result ${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/main.c
OUTPUT_VARIABLE out
LINK_OPTIONS ${undef_flag} "${lib_name}")
if(NOT result)
message(FATAL_ERROR "try_compile(... LINK_OPTIONS ...) failed:\n${out}")
endif()
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