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cmake: Cache results of CXX flag tests.

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Avoid re-testing to improve cmake build and regen speed.

Change-Id: I8e2fe6601036cc7d176cdc3738616261a2da408b
This commit is contained in:
Tom Finegan 2016-11-14 19:42:47 -08:00
parent 81c73fc78e
commit 54f155986d
1 changed files with 23 additions and 7 deletions
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30
build/cxx_flags.cmake
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@ -9,16 +9,32 @@ cmake_minimum_required(VERSION 3.2)
include(CheckCXXCompilerFlag)
# String used to cache failed CXX flags.
set(LIBWEBM_FAILED_CXX_FLAGS)
# Checks C++ compiler for support of $cxx_flag. Adds $cxx_flag to
# $CMAKE_CXX_FLAGS when the compile test passes. Caches $c_flag in
# $LIBWEBM_FAILED_CXX_FLAGS when the test fails.
function (add_cxx_flag_if_supported cxx_flag)
unset(FLAG_SUPPORTED CACHE)
message("Checking compiler flag support for: " ${cxx_flag})
CHECK_CXX_COMPILER_FLAG("${cxx_flag}" FLAG_SUPPORTED)
if (FLAG_SUPPORTED)
set(CMAKE_CXX_FLAGS "${cxx_flag} ${CMAKE_CXX_FLAGS}" CACHE STRING "" FORCE)
unset(CXX_FLAG_FOUND CACHE)
string(FIND "${CMAKE_CXX_FLAGS}" "${cxx_flag}" CXX_FLAG_FOUND)
unset(CXX_FLAG_FAILED CACHE)
string(FIND "${LIBWEBM_FAILED_CXX_FLAGS}" "${cxx_flag}" CXX_FLAG_FAILED)
if (${CXX_FLAG_FOUND} EQUAL -1 AND ${CXX_FLAG_FAILED} EQUAL -1)
unset(CXX_FLAG_SUPPORTED CACHE)
message("Checking CXX compiler flag support for: " ${cxx_flag})
check_cxx_compiler_flag("${cxx_flag}" CXX_FLAG_SUPPORTED)
if (CXX_FLAG_SUPPORTED)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${cxx_flag}" CACHE STRING ""
FORCE)
else ()
set(LIBWEBM_FAILED_CXX_FLAGS "${LIBWEBM_FAILED_CXX_FLAGS} ${cxx_flag}"
CACHE STRING "" FORCE)
endif ()
endif ()
endfunction ()
# Set warning levels.
if (MSVC)
add_cxx_flag_if_supported("/W4")
# Disable MSVC warnings that suggest making code non-portable.
@ -29,9 +45,9 @@ if (MSVC)
else ()
add_cxx_flag_if_supported("-Wall")
add_cxx_flag_if_supported("-Wextra")
add_cxx_flag_if_supported("-Wnarrowing")
add_cxx_flag_if_supported("-Wno-deprecated")
add_cxx_flag_if_supported("-Wshorten-64-to-32")
add_cxx_flag_if_supported("-Wnarrowing")
if (ENABLE_WERROR)
add_cxx_flag_if_supported("-Werror")
endif ()