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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.
#.rst:
# CheckIncludeFileCXX
# -------------------
#
# Provides a macro to check if a header file can be included in ``CXX``.
#
# .. command:: CHECK_INCLUDE_FILE_CXX
#
# ::
#
# CHECK_INCLUDE_FILE_CXX(<include> <variable> [<flags>])
#
# Check if the given ``<include>`` file may be included in a ``CXX``
# source file and store the result in an internal cache entry named
# ``<variable>``. The optional third argument may be used to add
# compilation flags to the check (or use ``CMAKE_REQUIRED_FLAGS`` below).
#
# The following variables may be set before calling this macro to modify
# the way the check is run:
#
# ``CMAKE_REQUIRED_FLAGS``
# string of compile command line flags
# ``CMAKE_REQUIRED_DEFINITIONS``
# list of macros to define (-DFOO=bar)
# ``CMAKE_REQUIRED_INCLUDES``
# list of include directories
# ``CMAKE_REQUIRED_QUIET``
# execute quietly without messages
#
# See modules :module:`CheckIncludeFile` and :module:`CheckIncludeFiles`
# to check for one or more ``C`` headers.
macro(CHECK_INCLUDE_FILE_CXX INCLUDE VARIABLE)
if(NOT DEFINED "${VARIABLE}" OR "x${${VARIABLE}}" STREQUAL "x${VARIABLE}")
if(CMAKE_REQUIRED_INCLUDES)
set(CHECK_INCLUDE_FILE_CXX_INCLUDE_DIRS "-DINCLUDE_DIRECTORIES=${CMAKE_REQUIRED_INCLUDES}")
else()
set(CHECK_INCLUDE_FILE_CXX_INCLUDE_DIRS)
endif()
set(MACRO_CHECK_INCLUDE_FILE_FLAGS ${CMAKE_REQUIRED_FLAGS})
set(CHECK_INCLUDE_FILE_VAR ${INCLUDE})
configure_file(${CMAKE_ROOT}/Modules/CheckIncludeFile.cxx.in
${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckIncludeFile.cxx)
if(NOT CMAKE_REQUIRED_QUIET)
message(STATUS "Looking for C++ include ${INCLUDE}")
endif()
if(${ARGC} EQUAL 3)
set(CMAKE_CXX_FLAGS_SAVE ${CMAKE_CXX_FLAGS})
string(APPEND CMAKE_CXX_FLAGS " ${ARGV2}")
endif()
try_compile(${VARIABLE}
${CMAKE_BINARY_DIR}
${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckIncludeFile.cxx
COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
CMAKE_FLAGS
-DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_INCLUDE_FILE_FLAGS}
"${CHECK_INCLUDE_FILE_CXX_INCLUDE_DIRS}"
OUTPUT_VARIABLE OUTPUT)
if(${ARGC} EQUAL 3)
set(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS_SAVE})
endif()
if(${VARIABLE})
if(NOT CMAKE_REQUIRED_QUIET)
message(STATUS "Looking for C++ include ${INCLUDE} - found")
endif()
set(${VARIABLE} 1 CACHE INTERNAL "Have include ${INCLUDE}")
file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
"Determining if the include file ${INCLUDE} "
"exists passed with the following output:\n"
"${OUTPUT}\n\n")
else()
if(NOT CMAKE_REQUIRED_QUIET)
message(STATUS "Looking for C++ include ${INCLUDE} - not found")
endif()
set(${VARIABLE} "" CACHE INTERNAL "Have include ${INCLUDE}")
file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
"Determining if the include file ${INCLUDE} "
"exists failed with the following output:\n"
"${OUTPUT}\n\n")
endif()
endif()
endmacro()
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