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cmake: probe gcc flags capability

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old gcc doesn't have some of the extended warning flags we want to apply...
use cmake to confirm the gcc has them before trying to use them.
This commit is contained in:
Andy Green 2019-05-15 07:27:18 +01:00
parent d0b63a8df1
commit 8a0ab2de48
1 changed files with 13 additions and 2 deletions
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15
CMakeLists.txt
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@ -1369,10 +1369,21 @@ if (CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUCXX OR (CMAKE_C_COMPILER_ID
message("Enabling ASAN")
endif()
check_c_compiler_flag("-Wignored-qualifiers" LWS_GCC_HAS_IGNORED_QUALIFIERS)
check_c_compiler_flag("-Wtype-limits" LWS_GCC_HAS_TYPE_LIMITS)
if (LWS_GCC_HAS_IGNORED_QUALIFIERS)
set(CMAKE_C_FLAGS "-Wignored-qualifiers ${CMAKE_C_FLAGS}" )
endif()
if (LWS_GCC_HAS_TYPE_LIMITS)
set(CMAKE_C_FLAGS "-Wtype-limits ${CMAKE_C_FLAGS}" )
endif()
if (UNIX AND NOT LWS_WITH_ESP32)
set(CMAKE_C_FLAGS "-Wall -Wsign-compare -Wignored-qualifiers -Wtype-limits -Wuninitialized -Werror ${VISIBILITY_FLAG} -Wundef ${GCOV_FLAGS} ${CMAKE_C_FLAGS} ${ASAN_FLAGS}" )
set(CMAKE_C_FLAGS "-Wall -Wsign-compare -Wuninitialized -Werror ${VISIBILITY_FLAG} -Wundef ${GCOV_FLAGS} ${CMAKE_C_FLAGS} ${ASAN_FLAGS}" )
else()
set(CMAKE_C_FLAGS "-Wall -Wsign-compare -Wignored-qualifiers -Wtype-limits -Wuninitialized -Werror ${VISIBILITY_FLAG} ${GCOV_FLAGS} ${CMAKE_C_FLAGS}" )
set(CMAKE_C_FLAGS "-Wall -Wsign-compare -Wuninitialized -Werror ${VISIBILITY_FLAG} ${GCOV_FLAGS} ${CMAKE_C_FLAGS}" )
endif()
endif ()