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CMake function for adding compiler flags

This commit is contained in:
Matt Clarkson 2014-08-01 14:24:56 +01:00
parent 6945096ba1
commit 6b1a6958c4
2 changed files with 48 additions and 25 deletions
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34
CMakeLists.txt
View File

@ -20,10 +20,8 @@ include_directories(${source_dir}/include)
ExternalProject_Get_Property(googletest binary_dir)
link_directories(${binary_dir})
# Set up the compiler flags
include(CheckCXXCompilerFlag)
# Enable the latest C++ standard possible
include(CheckCXXCompilerFlag)
check_cxx_compiler_flag(--std=c++14 HAVE_FLAG_CXX_14)
check_cxx_compiler_flag(--std=c++11 HAVE_FLAG_CXX_11)
check_cxx_compiler_flag(--std=c++0x HAVE_FLAG_CXX_0X)
@ -36,32 +34,18 @@ elseif (HAVE_FLAG_CXX_0X)
endif()
# Turn compiler warnings up to 11
check_cxx_compiler_flag(-Wall HAVE_FLAG_WALL)
if (HAVE_FLAG_WALL)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall")
endif()
check_cxx_compiler_flag(-Wshadow HAVE_FLAG_WSHADOW)
if (HAVE_FLAG_WSHADOW)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wshadow")
endif()
check_cxx_compiler_flag(-Werror HAVE_FLAG_WERROR)
if (HAVE_FLAG_WERROR)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror")
endif()
check_cxx_compiler_flag(-pedantic-errors HAVE_FLAG_PEDANTIC_ERRORS)
if (HAVE_FLAG_PEDANTIC_ERRORS)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pedantic-errors")
endif()
include(AddCXXCompilerFlag)
add_cxx_compiler_flag(-Wall)
add_cxx_compiler_flag(-Wshadow)
add_cxx_compiler_flag(-Werror)
add_cxx_compiler_flag(-pedantic-errors)
# Release flags
add_cxx_compiler_flag(-fno-strict-aliasing RELEASE)
# Add a debug definition so we can make decisions in the compilation
set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -DDEBUG")
# We relax the aliasing in release
check_cxx_compiler_flag(-fno-strict-aliasing HAVE_FLAG_NO_STRICT_ALIASING)
if (HAVE_FLAG_NO_STRICT_ALIASING)
set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -fno-strict-aliasing")
endif()
# Set OS
if(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
add_definitions(-DOS_MACOSX)

39
cmake/AddCXXCompilerFlag.cmake Normal file
View File

@ -0,0 +1,39 @@
# - Adds a compiler FLAG if it is supported by the compiler
#
# This function checks that the supplied compiler FLAG is supported and then
# adds it to the corresponding compiler FLAGs
#
# add_cxx_compiler_FLAG(<FLAG> [<VARIANT>])
#
# - Example
#
# include(AddCXXCompilerFlag)
# add_cxx_compiler_FLAG(-Wall)
# add_cxx_compiler_FLAG(-no-strict-aliasing RELEASE)
# Requires CMake 2.6+
if(__add_cxx_compiler_FLAG)
return()
endif()
set(__add_cxx_compiler_FLAG INCLUDED)
include(CheckCXXCompilerFlag)
function(add_cxx_compiler_flag FLAG)
if(ARGV1)
set(VARIANT ${ARGV1})
string(TOLOWER ${VARIANT} VARIANT)
set(VARIANT " ${VARIANT}")
endif()
message("-- Check compiler${VARIANT} flag ${FLAG}")
string(TOUPPER ${FLAG} SANITIZED_FLAG)
string(REGEX REPLACE "[^A-Za-z_0-9]" "_" ${SANITIZED_FLAG} SANITIZED_FLAG)
check_cxx_compiler_flag(${FLAG} ${SANITIZED_FLAG})
if(${SANITIZED_FLAG})
message("-- Check compiler${VARIANT} flag ${FLAG} -- works")
string(REGEX REPLACE "[^A-Za-z_0-9]" "_" "${VARIANT}" VARIANT)
string(TOUPPER "${VARIANT}" VARIANT)
set(CMAKE_CXX_FLAGS${VARIANT} "${CMAKE_CXX_FLAGS}${VARIANT} ${FLAG}" PARENT_SCOPE)
endif()
endfunction()