ref: 8430c5c81ff15468b38a542b1e27ba19c2e72768
parent: 3529032f760e3778cc51a7c083c1463d92a19ade
parent: b8a5d88fa56fb7432298be19059a88fc2a4e7750
author: Christopher Snowhill <kode54@gmail.com>
date: Sun Oct 29 12:44:56 EDT 2017
Merge pull request #77 from Rondom/compile_option_test Check whether CFLAGS are supported before adding
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,7 @@
cmake_minimum_required(VERSION 3.1)
project(libdumb C)
include(GNUInstallDirs)
+include(CheckCCompilerFlag)
# Bump major (== soversion) on API breakages
set(DUMB_VERSION_MAJOR 2)
@@ -13,15 +14,42 @@
option(BUILD_ALLEGRO4 "Build Allegro4 support" ON)
option(USE_SSE "Use SSE instructions" ON)
-set(CMAKE_C_FLAGS "-Wall -Wno-unused-variable -Wno-unused-but-set-variable")
-add_definitions(-D_FILE_OFFSET_BITS=64)
-add_definitions(-DDUMB_DECLARE_DEPRECATED)
-set(CMAKE_C_FLAGS_DEBUG "-ggdb -DDEBUGMODE=1 -D_DEBUG")
+function(check_and_add_c_compiler_flag flag flag_variable_to_add_to)
+ string(TOUPPER "${flag}" check_name)+ string(MAKE_C_IDENTIFIER "CC_HAS${check_name}" check_name)+ check_c_compiler_flag("${flag}" "${check_name}")+ if(${check_name})+ set(${flag_variable_to_add_to} "${flag} ${${flag_variable_to_add_to}}" PARENT_SCOPE)+ endif()
+endfunction()
+
+check_and_add_c_compiler_flag("-Wno-unused-variable" CMAKE_C_FLAGS)+check_and_add_c_compiler_flag("-Wno-unused-but-set-variable" CMAKE_C_FLAGS)+check_and_add_c_compiler_flag("-Wall" CMAKE_C_FLAGS)+add_definitions("-D_FILE_OFFSET_BITS=64")+add_definitions("-DDUMB_DECLARE_DEPRECATED")+
+set(CMAKE_C_FLAGS_DEBUG "-DDEBUGMODE=1 -D_DEBUG")
+check_and_add_c_compiler_flag("-ggdb" CMAKE_C_FLAGS_DEBUG)+check_and_add_c_compiler_flag("-Zi" CMAKE_C_FLAGS_DEBUG)+
set(CMAKE_C_FLAGS_RELEASE "-ffast-math -O2 -DNDEBUG")
-set(CMAKE_C_FLAGS_RELWITHDEBINFO "-ffast-math -g -O2 -DNDEBUG")
+
+set(CMAKE_C_FLAGS_RELWITHDEBINFO "-ffast-math -O2 -DNDEBUG")
+check_and_add_c_compiler_flag("-g" CMAKE_C_FLAGS_RELWITHDEBINFO)+check_and_add_c_compiler_flag("-Zi" CMAKE_C_FLAGS_RELWITHDEBINFO)+
set(CMAKE_C_FLAGS_MINSIZEREL "-ffast-math -Os -DNDEBUG")
+
if(USE_SSE)
- set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D_USE_SSE -msse")+ check_c_compiler_flag("-msse" "CC_HAS_MSSE")+ if(CC_HAS_MSSE)
+ message(STATUS "Compiling with SSE support")
+ set(CMAKE_C_FLAGS "-msse ${CMAKE_C_FLAGS}")+ add_definitions("-D_USE_SSE")+ else()
+ message(STATUS "Compiling without SSE support")
+ endif()
endif()
link_directories(${CMAKE_CURRENT_BINARY_DIR})