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cmake_minimum_required(VERSION 3.8)
project(CheckIPOSupported-C LANGUAGES C)
cmake_policy(SET CMP0069 NEW)
include(CheckIPOSupported)
check_ipo_supported(RESULT ipo_supported OUTPUT ipo_output)
if(ipo_supported)
set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)
elseif(CMake_TEST_IPO_WORKS_C)
string(REPLACE "\n" "\n " ipo_output "${ipo_output}")
message(FATAL_ERROR "IPO expected to work, but the check failed:\n ${ipo_output}")
endif()
add_library(foo foo.c)
if(NOT CYGWIN AND (NOT WIN32 OR "x${CMAKE_C_COMPILER_ID}" STREQUAL "xClang"))
add_library(bar SHARED bar.c)
if(WIN32)
# Bindexplib for clang supports LTO objects
set_target_properties(bar PROPERTIES WINDOWS_EXPORT_ALL_SYMBOLS ON)
endif()
else()
# TODO: bindexplib doesn't support exporting IPO symbols with other compilers on Windows
add_library(bar STATIC bar.c)
endif()
add_executable(CheckIPOSupported-C main.c)
target_link_libraries(CheckIPOSupported-C PUBLIC foo bar)
enable_testing()
add_test(NAME CheckIPOSupported-C COMMAND CheckIPOSupported-C)
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