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10 April 2024, 19:27:19 UTC
Revision 441dba80322ec1579b34dd64e13bcfcf004f7005 authored by Brad King on 19 November 2015, 15:12:58 UTC, committed by Brad King on 19 November 2015, 15:22:35 UTC 
Project: Guess default standard dialect if compiler was forced (#15852)
 
Prior to commit v3.4.0-rc1~71^2 (Project: Determine default language
dialect for the compiler, 2015-09-15) we always guessed the default
language standard dialect based on the compiler version.  This was not
reliable so that commit switched to computing the default language
standard dialect while detecting the compiler id.

When a toolchain file uses CMakeForceCompiler to set the compiler id
then the detection does not occur.  Therefore commit v3.4.0-rc1~54^2
(Project: Don't require computed default dialect if compiler was forced,
2015-09-22) made the lack of detection an error only if the compiler was
not forced.  However, this means that projects using CMakeForceCompiler
no longer even get the guess that we had before so <LANG>_COMPILER does
not work.

Due to the sophistication of CMake's compiler detection logic projects
should be ported away from using CMakeForceCompiler.  In the meantime,
restore a guess of the default language standard dialect when the
compiler is forced.
1 parent d137585
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Tip revision: 441dba80322ec1579b34dd64e13bcfcf004f7005 authored by Brad King on 19 November 2015, 15:12:58 UTC
Project: Guess default standard dialect if compiler was forced (#15852)
Tip revision: 441dba8
CompileFlags.cmake 
#=============================================================================
# CMake - Cross Platform Makefile Generator
# Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================

#-----------------------------------------------------------------------------
# set some special flags for different compilers
#
if(CMAKE_GENERATOR MATCHES "Visual Studio 7")
  set(CMAKE_SKIP_COMPATIBILITY_TESTS 1)
endif()

if(WIN32 AND CMAKE_C_COMPILER_ID STREQUAL "Intel")
  set(_INTEL_WINDOWS 1)
endif()

# Disable deprecation warnings for standard C functions.
# really only needed for newer versions of VS, but should
# not hurt other versions, and this will work into the
# future
if(MSVC OR _INTEL_WINDOWS)
  add_definitions(-D_CRT_SECURE_NO_DEPRECATE -D_CRT_NONSTDC_NO_DEPRECATE)
else()
endif()

#silence duplicate symbol warnings on AIX
if(CMAKE_SYSTEM_NAME MATCHES "AIX")
  if(NOT CMAKE_COMPILER_IS_GNUCXX)
    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -bhalt:5 ")
  endif()
endif()

if(CMAKE_SYSTEM_NAME MATCHES "IRIX")
  if(NOT CMAKE_COMPILER_IS_GNUCXX)
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wl,-woff84 -no_auto_include")
    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,-woff15")
  endif()
endif()

if(CMAKE_SYSTEM MATCHES "OSF1-V")
  if(NOT CMAKE_COMPILER_IS_GNUCXX)
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -timplicit_local -no_implicit_include ")
  endif()
endif()

if(CMAKE_SYSTEM_NAME MATCHES "HP-UX" AND CMAKE_CXX_COMPILER_ID MATCHES "HP")
  # HP aCC since version 3.80 supports the flag +hpxstd98 to get ANSI C++98
  # template support. It is known that version 6.25 doesn't need that flag.
  # Versions prior to 3.80 will not be able to build CMake. Current assumption:
  # it is needed for every version from 3.80 to 4 to get it working.
  if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4 AND
         NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.80)
    # use new C++ library and improved template support
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -AA +hpxstd98")
  endif()
endif()

# Workaround for short jump tables on PA-RISC
if(CMAKE_SYSTEM_PROCESSOR MATCHES "^parisc")
  if(CMAKE_COMPILER_IS_GNUC)
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mlong-calls")
  endif()
  if(CMAKE_COMPILER_IS_GNUCXX)
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mlong-calls")
  endif()
endif()

if (CMAKE_CXX_COMPILER_ID STREQUAL SunPro)
  if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.13)
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++03")
  else()
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -library=stlport4")
  endif()
endif()

# use the ansi CXX compile flag for building cmake
if (CMAKE_ANSI_CXXFLAGS)
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CMAKE_ANSI_CXXFLAGS}")
endif ()

if (CMAKE_ANSI_CFLAGS)
  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${CMAKE_ANSI_CFLAGS}")
endif ()
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