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CheckTypeSize: Add support for C++ 

Previously if headers required to check the size of a type can be
compiled with C++ compiler only, the check would fail because the C
compiler fails.  As a consequence, HAVE_${VARIABLE} would be set to
false, and ${VARIABLE} will be empty.

Teach CHECK_TYPE_SIZE to accept a new optional argument LANGUAGE
that allows one to explicitly set the compiler to use.  The new
signature is therefore:

   CHECK_TYPE_SIZE(TYPE VARIABLE [BUILTIN_TYPES_ONLY]
                                 [LANGUAGE <language>])
This commit is contained in:
Daniele E. Domenichelli 2013-10-18 11:55:18 +02:00
parent bf02e75079
commit 07a2342fbc
1 changed files with 43 additions and 6 deletions
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49
Modules/CheckTypeSize.cmake
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@ -6,7 +6,8 @@
#
# ::
#
# CHECK_TYPE_SIZE(TYPE VARIABLE [BUILTIN_TYPES_ONLY])
# CHECK_TYPE_SIZE(TYPE VARIABLE [BUILTIN_TYPES_ONLY]
# [LANGUAGE <language>])
#
# Check if the type exists and determine its size. On return,
# "HAVE_${VARIABLE}" holds the existence of the type, and "${VARIABLE}"
@ -36,6 +37,9 @@
# check automatically includes the available headers, thus supporting
# checks of types defined in the headers.
#
# If LANGUAGE is set, the specified compiler will be used to perform the
# check. Acceptable values are C and CXX
#
# Despite the name of the macro you may use it to check the size of more
# complex expressions, too. To check e.g. for the size of a struct
# member you can do something like this:
@ -79,7 +83,7 @@ get_filename_component(__check_type_size_dir "${CMAKE_CURRENT_LIST_FILE}" PATH)
#-----------------------------------------------------------------------------
# Helper function. DO NOT CALL DIRECTLY.
function(__check_type_size_impl type var map builtin)
function(__check_type_size_impl type var map builtin language)
message(STATUS "Check size of ${type}")
# Include header files.
@ -101,8 +105,13 @@ function(__check_type_size_impl type var map builtin)
# Perform the check.
set(src ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CheckTypeSize/${var}.c)
if("${language}" STREQUAL "C")
set(src ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CheckTypeSize/${var}.c)
elseif("${language}" STREQUAL "CXX")
set(src ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CheckTypeSize/${var}.cpp)
else()
message(FATAL_ERROR "Unknown language:\n ${language}\nSupported languages: C, CXX.\n")
endif()
set(bin ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CheckTypeSize/${var}.bin)
configure_file(${__check_type_size_dir}/CheckTypeSize.c.in ${src} @ONLY)
try_compile(HAVE_${var} ${CMAKE_BINARY_DIR} ${src}
@ -176,8 +185,36 @@ endfunction()
#-----------------------------------------------------------------------------
macro(CHECK_TYPE_SIZE TYPE VARIABLE)
# parse arguments
unset(doing)
foreach(arg ${ARGN})
if("x${arg}" STREQUAL "xBUILTIN_TYPES_ONLY")
set(_CHECK_TYPE_SIZE_${arg} 1)
unset(doing)
elseif("x${arg}" STREQUAL "xLANGUAGE") # change to MATCHES for more keys
set(doing "${arg}")
set(_CHECK_TYPE_SIZE_${doing} "")
elseif("x${doing}" STREQUAL "xLANGUAGE")
set(_CHECK_TYPE_SIZE_${doing} "${arg}")
unset(doing)
else()
message(FATAL_ERROR "Unknown argument:\n ${arg}\n")
endif()
endforeach()
if("x${doing}" MATCHES "^x(LANGUAGE)$")
message(FATAL_ERROR "Missing argument:\n ${doing} arguments requires a value\n")
endif()
if(DEFINED _CHECK_TYPE_SIZE_LANGUAGE)
if(NOT "x${_CHECK_TYPE_SIZE_LANGUAGE}" MATCHES "^x(C|CXX)$")
message(FATAL_ERROR "Unknown language:\n ${_CHECK_TYPE_SIZE_LANGUAGE}.\nSupported languages: C, CXX.\n")
endif()
set(_language ${_CHECK_TYPE_SIZE_LANGUAGE})
else()
set(_language C)
endif()
# Optionally check for standard headers.
if("${ARGV2}" STREQUAL "BUILTIN_TYPES_ONLY")
if(_CHECK_TYPE_SIZE_BUILTIN_TYPES_ONLY)
set(_builtin 0)
else()
set(_builtin 1)
@ -190,7 +227,7 @@ macro(CHECK_TYPE_SIZE TYPE VARIABLE)
set(${VARIABLE}_KEYS)
set(_map_file ${CMAKE_BINARY_DIR}/${CMAKE_FILES_DIRECTORY}/CheckTypeSize/${VARIABLE}.cmake)
if(NOT DEFINED HAVE_${VARIABLE})
__check_type_size_impl(${TYPE} ${VARIABLE} ${_map_file} ${_builtin})
__check_type_size_impl(${TYPE} ${VARIABLE} ${_map_file} ${_builtin} ${_language})
endif()
include(${_map_file} OPTIONAL)
set(_map_file)