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50 lines
1.8 KiB
50 lines
1.8 KiB
# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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# file Copyright.txt or https://cmake.org/licensing for details.
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#[=======================================================================[.rst:
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CMakeBackwardCompatibilityCXX
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-----------------------------
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define a bunch of backwards compatibility variables
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::
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CMAKE_ANSI_CXXFLAGS - flag for ansi c++
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CMAKE_HAS_ANSI_STRING_STREAM - has <strstream>
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include(TestForANSIStreamHeaders)
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include(CheckIncludeFileCXX)
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include(TestForSTDNamespace)
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include(TestForANSIForScope)
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#]=======================================================================]
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if(NOT CMAKE_SKIP_COMPATIBILITY_TESTS)
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# check for some ANSI flags in the CXX compiler if it is not gnu
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if(NOT CMAKE_COMPILER_IS_GNUCXX)
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include(TestCXXAcceptsFlag)
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set(CMAKE_TRY_ANSI_CXX_FLAGS "")
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if(CMAKE_SYSTEM_NAME MATCHES "OSF")
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set(CMAKE_TRY_ANSI_CXX_FLAGS "-std strict_ansi -nopure_cname")
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endif()
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# if CMAKE_TRY_ANSI_CXX_FLAGS has something in it, see
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# if the compiler accepts it
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if(NOT CMAKE_TRY_ANSI_CXX_FLAGS STREQUAL "")
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CHECK_CXX_ACCEPTS_FLAG(${CMAKE_TRY_ANSI_CXX_FLAGS} CMAKE_CXX_ACCEPTS_FLAGS)
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# if the compiler liked the flag then set CMAKE_ANSI_CXXFLAGS
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# to the flag
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if(CMAKE_CXX_ACCEPTS_FLAGS)
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set(CMAKE_ANSI_CXXFLAGS ${CMAKE_TRY_ANSI_CXX_FLAGS} CACHE INTERNAL
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"What flags are required by the c++ compiler to make it ansi." )
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endif()
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endif()
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endif()
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set(CMAKE_CXX_FLAGS_SAVE ${CMAKE_CXX_FLAGS})
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string(APPEND CMAKE_CXX_FLAGS " ${CMAKE_ANSI_CXXFLAGS}")
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include(TestForANSIStreamHeaders)
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include(CheckIncludeFileCXX)
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include(TestForSTDNamespace)
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include(TestForANSIForScope)
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include(TestForSSTREAM)
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS_SAVE}")
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endif()
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