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cmake: Fix required flag check.

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It always passed after first test due to lack of CACHE in unset()
call. Also:

- Fix flag name in error message.
- Use actual flag instead of hard coded -std=c++11

Change-Id: I29c0dc4fd0f5ce97f658919a5739e15831a00281
This commit is contained in:
Tom Finegan 2017-01-23 10:58:45 -08:00
parent 4494ce468a
commit 2b2c196558
1 changed files with 3 additions and 3 deletions
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6
build/cxx_flags.cmake
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@ -42,14 +42,14 @@ function (require_cxx_flag cxx_flag)
string(FIND "${CMAKE_CXX_FLAGS}" "${cxx_flag}" CXX_FLAG_FOUND)
if (${CXX_FLAG_FOUND} EQUAL -1)
unset(LIBWEBM_HAVE_CXX_FLAG)
unset(LIBWEBM_HAVE_CXX_FLAG CACHE)
message("Checking CXX compiler flag support for: " ${cxx_flag})
check_cxx_compiler_flag("${cxx_flag}" LIBWEBM_HAVE_CXX_FLAG)
if (NOT LIBWEBM_HAVE_CXX_FLAG)
message(FATAL_ERROR
"${PROJECT_NAME} requires support for CXX flag: ${flag}.")
"${PROJECT_NAME} requires support for CXX flag: ${cxx_flag}.")
endif ()
set(CMAKE_CXX_FLAGS "-std=c++11 ${CMAKE_CXX_FLAGS}" CACHE STRING "" FORCE)
set(CMAKE_CXX_FLAGS "${cxx_flag} ${CMAKE_CXX_FLAGS}" CACHE STRING "" FORCE)
endif ()
endfunction ()