| # 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() |
| |
