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# SoX Resampler Library Copyright (c) 2007-16 robs@users.sourceforge.net
# Licence for this file: LGPL v2.1 See LICENCE for details.
# - Function to find C compiler feature flags
include (CheckCSourceCompiles)
include (FindPackageHandleStandardArgs)
function (FindCFlags PKG_NAME PKG_DESC TRIAL_C_FLAGS TEST_C_SOURCE)
foreach (TRIAL_C_FLAG ${TRIAL_C_FLAGS})
message (STATUS "Trying ${PKG_NAME} C flags: ${TRIAL_C_FLAG}")
unset (DETECT_${PKG_NAME}_C_FLAGS CACHE) #displayed by check_c_source_compiles
set (TMP "${CMAKE_REQUIRED_FLAGS}")
set (CMAKE_REQUIRED_FLAGS "${TRIAL_C_FLAG}")
check_c_source_compiles ("${TEST_C_SOURCE}" DETECT_${PKG_NAME}_C_FLAGS)
set (CMAKE_REQUIRED_FLAGS "${TMP}")
if (DETECT_${PKG_NAME}_C_FLAGS)
set (DETECTED_C_FLAGS "${TRIAL_C_FLAG}")
break ()
endif ()
endforeach ()
# N.B. Will not overwrite existing cache variable:
set (${PKG_NAME}_C_FLAGS "${DETECTED_C_FLAGS}"
CACHE STRING "C compiler flags for ${PKG_DESC}")
find_package_handle_standard_args (
${PKG_NAME} DEFAULT_MSG ${PKG_NAME}_C_FLAGS ${PKG_NAME}_C_FLAGS)
mark_as_advanced (${PKG_NAME}_C_FLAGS)
set (${PKG_NAME}_FOUND ${${PKG_NAME}_FOUND} PARENT_SCOPE)
endfunction ()
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