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cmake: Added return/clear variable to function

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Made sure output_variable gets cleared for case where
target compiler is not supported.

Signed-off-by: Noel Eck <noel.eck@intel.com>
This commit is contained in:
Noel Eck 2016-10-26 11:42:20 -07:00
parent e21e05a039
commit 585f2eb331
1 changed files with 28 additions and 28 deletions
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56
CMakeLists.txt
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@ -30,35 +30,37 @@ set (CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules ${CMAKE_MODULE_
# The result of output_variable is set to the sanitized flag name if supported
# or cleared if the flag is not supported.
function (compiler_flag_supported compiler output_variable flag)
# Currently only C and CXX compile flags
# Currently only C and CXX compile flags, clear and return if not supported
if (NOT ${compiler} MATCHES "C|CXX")
message (WARNING "Unknown compiler: ${compiler}")
set ("${output_variable}" "" PARENT_SCOPE)
return ()
endif (NOT ${compiler} MATCHES "C|CXX")
string (REPLACE "-" "_" SANITIZED_FLAG_NAME "${flag}")
string (REPLACE "/" "_" SANITIZED_FLAG_NAME "${SANITIZED_FLAG_NAME}")
string (REPLACE "=" "_" SANITIZED_FLAG_NAME "${SANITIZED_FLAG_NAME}")
string (REPLACE " " "_" SANITIZED_FLAG_NAME "${SANITIZED_FLAG_NAME}")
# Disable messages from CHECK_C/XX_COMPILER_FLAGS macros
set (CMAKE_REQUIRED_QUIET_SAVED ${CMAKE_REQUIRED_QUIET})
set (CMAKE_REQUIRED_QUIET ON)
# C or CXX?
if (${compiler} STREQUAL C)
CHECK_C_COMPILER_FLAG("${flag}" HAS_${SANITIZED_FLAG_NAME})
elseif (${compiler} STREQUAL CXX)
CHECK_CXX_COMPILER_FLAG("${flag}" HAS_${SANITIZED_FLAG_NAME})
endif ()
# Restore previous CMAKE_REQUIRED_QUIET state
set (CMAKE_REQUIRED_QUIET ${CMAKE_REQUIRED_QUIET_SAVED})
# Does the compiler support this flag?
if (HAS_${SANITIZED_FLAG_NAME})
set ("${output_variable}" "${SANITIZED_FLAG_NAME}" PARENT_SCOPE)
else ()
string (REPLACE "-" "_" SANITIZED_FLAG_NAME "${flag}")
string (REPLACE "/" "_" SANITIZED_FLAG_NAME "${SANITIZED_FLAG_NAME}")
string (REPLACE "=" "_" SANITIZED_FLAG_NAME "${SANITIZED_FLAG_NAME}")
string (REPLACE " " "_" SANITIZED_FLAG_NAME "${SANITIZED_FLAG_NAME}")
# Disable messages from CHECK_C/XX_COMPILER_FLAGS macros
set (CMAKE_REQUIRED_QUIET_SAVED ${CMAKE_REQUIRED_QUIET})
set (CMAKE_REQUIRED_QUIET ON)
# C or CXX?
if (${compiler} STREQUAL C)
CHECK_C_COMPILER_FLAG("${flag}" HAS_${SANITIZED_FLAG_NAME})
elseif (${compiler} STREQUAL CXX)
CHECK_CXX_COMPILER_FLAG("${flag}" HAS_${SANITIZED_FLAG_NAME})
endif ()
# Restore previous CMAKE_REQUIRED_QUIET state
set (CMAKE_REQUIRED_QUIET ${CMAKE_REQUIRED_QUIET_SAVED})
# Does the compiler support this flag?
if (HAS_${SANITIZED_FLAG_NAME})
set ("${output_variable}" "${SANITIZED_FLAG_NAME}" PARENT_SCOPE)
else ()
set ("${output_variable}" "" PARENT_SCOPE)
endif()
set ("${output_variable}" "" PARENT_SCOPE)
endif()
endfunction ()
@ -85,8 +87,6 @@ function (upm_add_compile_flags compiler)
set (CMAKE_${compiler}_FLAGS ${_TMP_COMPILER_FLAGS} PARENT_SCOPE)
endfunction ()
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
# Compiler flags common to both C and CXX
set (C_CXX_WARNING_FLAGS -Wall)