1d72b4da10
- Also CheckCompilerFlag module suggested in the deprecation notice - Lowercase style used for macro - Descriptions extended - Added examples
69 lines
2.3 KiB
CMake
69 lines
2.3 KiB
CMake
# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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# file LICENSE.rst 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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This module defines several backward compatibility cache variables for the
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``CXX`` language to support early C++ (pre-C++98, ANSI C++).
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The following modules are included by this module:
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* :module:`TestForANSIForScope`
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* :module:`TestForANSIStreamHeaders`
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* :module:`TestForSSTREAM`
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* :module:`TestForSTDNamespace`
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Additionally, the following cache variable may be defined:
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``CMAKE_ANSI_CXXFLAGS``
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A space-separated string of compiler options for enabling ANSI C++ mode, if
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available.
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.. note::
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This module is intended for C++ code written before ``C++ 98``. As of the
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``C++ 98`` standard, these issues have been formally addressed, making such
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checks obsolete.
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Examples
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^^^^^^^^
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Including this module provides backward compatibility cache variables:
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.. code-block:: cmake
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include(CMakeBackwardCompatibilityCXX)
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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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