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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:
CMakeBackwardCompatibilityCXX
-----------------------------
define a bunch of backwards compatibility variables
::
CMAKE_ANSI_CXXFLAGS - flag for ansi c++
CMAKE_HAS_ANSI_STRING_STREAM - has <strstream>
include(TestForANSIStreamHeaders)
include(CheckIncludeFileCXX)
include(TestForSTDNamespace)
include(TestForANSIForScope)
#]=======================================================================]
if(NOT CMAKE_SKIP_COMPATIBILITY_TESTS)
# check for some ANSI flags in the CXX compiler if it is not gnu
if(NOT CMAKE_COMPILER_IS_GNUCXX)
include(TestCXXAcceptsFlag)
set(CMAKE_TRY_ANSI_CXX_FLAGS "")
if(CMAKE_SYSTEM_NAME MATCHES "OSF")
set(CMAKE_TRY_ANSI_CXX_FLAGS "-std strict_ansi -nopure_cname")
endif()
# if CMAKE_TRY_ANSI_CXX_FLAGS has something in it, see
# if the compiler accepts it
if(NOT CMAKE_TRY_ANSI_CXX_FLAGS STREQUAL "")
CHECK_CXX_ACCEPTS_FLAG(${CMAKE_TRY_ANSI_CXX_FLAGS} CMAKE_CXX_ACCEPTS_FLAGS)
# if the compiler liked the flag then set CMAKE_ANSI_CXXFLAGS
# to the flag
if(CMAKE_CXX_ACCEPTS_FLAGS)
set(CMAKE_ANSI_CXXFLAGS ${CMAKE_TRY_ANSI_CXX_FLAGS} CACHE INTERNAL
"What flags are required by the c++ compiler to make it ansi." )
endif()
endif()
endif()
set(CMAKE_CXX_FLAGS_SAVE ${CMAKE_CXX_FLAGS})
string(APPEND CMAKE_CXX_FLAGS " ${CMAKE_ANSI_CXXFLAGS}")
include(TestForANSIStreamHeaders)
include(CheckIncludeFileCXX)
include(TestForSTDNamespace)
include(TestForANSIForScope)
include(TestForSSTREAM)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS_SAVE}")
endif()
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