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CMake/Modules/CMakeCXXInformation.cmake
Brad King 86578eccf2 Simplify CMake per-source license notices 
Per-source copyright/license notice headers that spell out copyright holder
names and years are hard to maintain and often out-of-date or plain wrong.
Precise contributor information is already maintained automatically by the
version control tool.  Ultimately it is the receiver of a file who is
responsible for determining its licensing status, and per-source notices are
merely a convenience.  Therefore it is simpler and more accurate for
each source to have a generic notice of the license name and references to
more detailed information on copyright holders and full license terms.

Our `Copyright.txt` file now contains a list of Contributors whose names
appeared source-level copyright notices.  It also references version control
history for more precise information.  Therefore we no longer need to spell
out the list of Contributors in each source file notice.

Replace CMake per-source copyright/license notice headers with a short
description of the license and links to `Copyright.txt` and online information
available from "https://cmake.org/licensing".  The online URL also handles
cases of modules being copied out of our source into other projects, so we
can drop our notices about replacing links with full license text.

Run the `Utilities/Scripts/filter-notices.bash` script to perform the majority
of the replacements mechanically.  Manually fix up shebang lines and trailing
newlines in a few files.  Manually update the notices in a few files that the
script does not handle.
2016-09-27 15:14:44 -04:00

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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.
# This file sets the basic flags for the C++ language in CMake.
# It also loads the available platform file for the system-compiler
# if it exists.
# It also loads a system - compiler - processor (or target hardware)
# specific file, which is mainly useful for crosscompiling and embedded systems.
include(CMakeLanguageInformation)
# some compilers use different extensions (e.g. sdcc uses .rel)
# so set the extension here first so it can be overridden by the compiler specific file
if(UNIX)
set(CMAKE_CXX_OUTPUT_EXTENSION .o)
else()
set(CMAKE_CXX_OUTPUT_EXTENSION .obj)
endif()
set(_INCLUDED_FILE 0)
# Load compiler-specific information.
if(CMAKE_CXX_COMPILER_ID)
include(Compiler/${CMAKE_CXX_COMPILER_ID}-CXX OPTIONAL)
endif()
set(CMAKE_BASE_NAME)
get_filename_component(CMAKE_BASE_NAME "${CMAKE_CXX_COMPILER}" NAME_WE)
# since the gnu compiler has several names force g++
if(CMAKE_COMPILER_IS_GNUCXX)
set(CMAKE_BASE_NAME g++)
endif()
# load a hardware specific file, mostly useful for embedded compilers
if(CMAKE_SYSTEM_PROCESSOR)
if(CMAKE_CXX_COMPILER_ID)
include(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_CXX_COMPILER_ID}-CXX-${CMAKE_SYSTEM_PROCESSOR} OPTIONAL RESULT_VARIABLE _INCLUDED_FILE)
endif()
if (NOT _INCLUDED_FILE)
include(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_BASE_NAME}-${CMAKE_SYSTEM_PROCESSOR} OPTIONAL)
endif ()
endif()
# load the system- and compiler specific files
if(CMAKE_CXX_COMPILER_ID)
include(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_CXX_COMPILER_ID}-CXX OPTIONAL RESULT_VARIABLE _INCLUDED_FILE)
endif()
if (NOT _INCLUDED_FILE)
include(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_BASE_NAME} OPTIONAL
RESULT_VARIABLE _INCLUDED_FILE)
endif ()
# load any compiler-wrapper specific information
if (CMAKE_CXX_COMPILER_WRAPPER)
__cmake_include_compiler_wrapper(CXX)
endif ()
# We specify the compiler information in the system file for some
# platforms, but this language may not have been enabled when the file
# was first included. Include it again to get the language info.
# Remove this when all compiler info is removed from system files.
if (NOT _INCLUDED_FILE)
include(Platform/${CMAKE_SYSTEM_NAME} OPTIONAL)
endif ()
if(CMAKE_CXX_SIZEOF_DATA_PTR)
foreach(f ${CMAKE_CXX_ABI_FILES})
include(${f})
endforeach()
unset(CMAKE_CXX_ABI_FILES)
endif()
# This should be included before the _INIT variables are
# used to initialize the cache. Since the rule variables
# have if blocks on them, users can still define them here.
# But, it should still be after the platform file so changes can
# be made to those values.
if(CMAKE_USER_MAKE_RULES_OVERRIDE)
# Save the full path of the file so try_compile can use it.
include(${CMAKE_USER_MAKE_RULES_OVERRIDE} RESULT_VARIABLE _override)
set(CMAKE_USER_MAKE_RULES_OVERRIDE "${_override}")
endif()
if(CMAKE_USER_MAKE_RULES_OVERRIDE_CXX)
# Save the full path of the file so try_compile can use it.
include(${CMAKE_USER_MAKE_RULES_OVERRIDE_CXX} RESULT_VARIABLE _override)
set(CMAKE_USER_MAKE_RULES_OVERRIDE_CXX "${_override}")
endif()
# Create a set of shared library variable specific to C++
# For 90% of the systems, these are the same flags as the C versions
# so if these are not set just copy the flags from the c version
if(NOT CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS)
set(CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS ${CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS})
endif()
if(NOT CMAKE_CXX_COMPILE_OPTIONS_PIC)
set(CMAKE_CXX_COMPILE_OPTIONS_PIC ${CMAKE_C_COMPILE_OPTIONS_PIC})
endif()
if(NOT CMAKE_CXX_COMPILE_OPTIONS_PIE)
set(CMAKE_CXX_COMPILE_OPTIONS_PIE ${CMAKE_C_COMPILE_OPTIONS_PIE})
endif()
if(NOT CMAKE_CXX_COMPILE_OPTIONS_DLL)
set(CMAKE_CXX_COMPILE_OPTIONS_DLL ${CMAKE_C_COMPILE_OPTIONS_DLL})
endif()
if(NOT CMAKE_SHARED_LIBRARY_CXX_FLAGS)
set(CMAKE_SHARED_LIBRARY_CXX_FLAGS ${CMAKE_SHARED_LIBRARY_C_FLAGS})
endif()
if(NOT DEFINED CMAKE_SHARED_LIBRARY_LINK_CXX_FLAGS)
set(CMAKE_SHARED_LIBRARY_LINK_CXX_FLAGS ${CMAKE_SHARED_LIBRARY_LINK_C_FLAGS})
endif()
if(NOT CMAKE_SHARED_LIBRARY_RUNTIME_CXX_FLAG)
set(CMAKE_SHARED_LIBRARY_RUNTIME_CXX_FLAG ${CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG})
endif()
if(NOT CMAKE_SHARED_LIBRARY_RUNTIME_CXX_FLAG_SEP)
set(CMAKE_SHARED_LIBRARY_RUNTIME_CXX_FLAG_SEP ${CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG_SEP})
endif()
if(NOT CMAKE_SHARED_LIBRARY_RPATH_LINK_CXX_FLAG)
set(CMAKE_SHARED_LIBRARY_RPATH_LINK_CXX_FLAG ${CMAKE_SHARED_LIBRARY_RPATH_LINK_C_FLAG})
endif()
if(NOT DEFINED CMAKE_EXE_EXPORTS_CXX_FLAG)
set(CMAKE_EXE_EXPORTS_CXX_FLAG ${CMAKE_EXE_EXPORTS_C_FLAG})
endif()
if(NOT DEFINED CMAKE_SHARED_LIBRARY_SONAME_CXX_FLAG)
set(CMAKE_SHARED_LIBRARY_SONAME_CXX_FLAG ${CMAKE_SHARED_LIBRARY_SONAME_C_FLAG})
endif()
if(NOT CMAKE_EXECUTABLE_RUNTIME_CXX_FLAG)
set(CMAKE_EXECUTABLE_RUNTIME_CXX_FLAG ${CMAKE_SHARED_LIBRARY_RUNTIME_CXX_FLAG})
endif()
if(NOT CMAKE_EXECUTABLE_RUNTIME_CXX_FLAG_SEP)
set(CMAKE_EXECUTABLE_RUNTIME_CXX_FLAG_SEP ${CMAKE_SHARED_LIBRARY_RUNTIME_CXX_FLAG_SEP})
endif()
if(NOT CMAKE_EXECUTABLE_RPATH_LINK_CXX_FLAG)
set(CMAKE_EXECUTABLE_RPATH_LINK_CXX_FLAG ${CMAKE_SHARED_LIBRARY_RPATH_LINK_CXX_FLAG})
endif()
if(NOT DEFINED CMAKE_SHARED_LIBRARY_LINK_CXX_WITH_RUNTIME_PATH)
set(CMAKE_SHARED_LIBRARY_LINK_CXX_WITH_RUNTIME_PATH ${CMAKE_SHARED_LIBRARY_LINK_C_WITH_RUNTIME_PATH})
endif()
if(NOT CMAKE_INCLUDE_FLAG_CXX)
set(CMAKE_INCLUDE_FLAG_CXX ${CMAKE_INCLUDE_FLAG_C})
endif()
if(NOT CMAKE_INCLUDE_FLAG_SEP_CXX)
set(CMAKE_INCLUDE_FLAG_SEP_CXX ${CMAKE_INCLUDE_FLAG_SEP_C})
endif()
# for most systems a module is the same as a shared library
# so unless the variable CMAKE_MODULE_EXISTS is set just
# copy the values from the LIBRARY variables
if(NOT CMAKE_MODULE_EXISTS)
set(CMAKE_SHARED_MODULE_CXX_FLAGS ${CMAKE_SHARED_LIBRARY_CXX_FLAGS})
set(CMAKE_SHARED_MODULE_CREATE_CXX_FLAGS ${CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS})
endif()
# repeat for modules
if(NOT CMAKE_SHARED_MODULE_CREATE_CXX_FLAGS)
set(CMAKE_SHARED_MODULE_CREATE_CXX_FLAGS ${CMAKE_SHARED_MODULE_CREATE_C_FLAGS})
endif()
if(NOT CMAKE_SHARED_MODULE_CXX_FLAGS)
set(CMAKE_SHARED_MODULE_CXX_FLAGS ${CMAKE_SHARED_MODULE_C_FLAGS})
endif()
# Initialize CXX link type selection flags from C versions.
foreach(type SHARED_LIBRARY SHARED_MODULE EXE)
if(NOT CMAKE_${type}_LINK_STATIC_CXX_FLAGS)
set(CMAKE_${type}_LINK_STATIC_CXX_FLAGS
${CMAKE_${type}_LINK_STATIC_C_FLAGS})
endif()
if(NOT CMAKE_${type}_LINK_DYNAMIC_CXX_FLAGS)
set(CMAKE_${type}_LINK_DYNAMIC_CXX_FLAGS
${CMAKE_${type}_LINK_DYNAMIC_C_FLAGS})
endif()
endforeach()
# add the flags to the cache based
# on the initial values computed in the platform/*.cmake files
# use _INIT variables so that this only happens the first time
# and you can set these flags in the cmake cache
set(CMAKE_CXX_FLAGS_INIT "$ENV{CXXFLAGS} ${CMAKE_CXX_FLAGS_INIT}")
foreach(c "" _DEBUG _RELEASE _MINSIZEREL _RELWITHDEBINFO)
string(STRIP "${CMAKE_CXX_FLAGS${c}_INIT}" CMAKE_CXX_FLAGS${c}_INIT)
endforeach()
set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS_INIT}" CACHE STRING
"Flags used by the compiler during all build types.")
if(NOT CMAKE_NOT_USING_CONFIG_FLAGS)
set (CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG_INIT}" CACHE STRING
"Flags used by the compiler during debug builds.")
set (CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL_INIT}" CACHE STRING
"Flags used by the compiler during release builds for minimum size.")
set (CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE_INIT}" CACHE STRING
"Flags used by the compiler during release builds.")
set (CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO_INIT}" CACHE STRING
"Flags used by the compiler during release builds with debug info.")
endif()
if(CMAKE_CXX_STANDARD_LIBRARIES_INIT)
set(CMAKE_CXX_STANDARD_LIBRARIES "${CMAKE_CXX_STANDARD_LIBRARIES_INIT}"
CACHE STRING "Libraries linked by default with all C++ applications.")
mark_as_advanced(CMAKE_CXX_STANDARD_LIBRARIES)
endif()
include(CMakeCommonLanguageInclude)
# now define the following rules:
# CMAKE_CXX_CREATE_SHARED_LIBRARY
# CMAKE_CXX_CREATE_SHARED_MODULE
# CMAKE_CXX_COMPILE_OBJECT
# CMAKE_CXX_LINK_EXECUTABLE
# variables supplied by the generator at use time
# <TARGET>
# <TARGET_BASE> the target without the suffix
# <OBJECTS>
# <OBJECT>
# <LINK_LIBRARIES>
# <FLAGS>
# <LINK_FLAGS>
# CXX compiler information
# <CMAKE_CXX_COMPILER>
# <CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS>
# <CMAKE_CXX_SHARED_MODULE_CREATE_FLAGS>
# <CMAKE_CXX_LINK_FLAGS>
# Static library tools
# <CMAKE_AR>
# <CMAKE_RANLIB>
# create a shared C++ library
if(NOT CMAKE_CXX_CREATE_SHARED_LIBRARY)
set(CMAKE_CXX_CREATE_SHARED_LIBRARY
"<CMAKE_CXX_COMPILER> <CMAKE_SHARED_LIBRARY_CXX_FLAGS> <LANGUAGE_COMPILE_FLAGS> <LINK_FLAGS> <CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS> <SONAME_FLAG><TARGET_SONAME> -o <TARGET> <OBJECTS> <LINK_LIBRARIES>")
endif()
# create a c++ shared module copy the shared library rule by default
if(NOT CMAKE_CXX_CREATE_SHARED_MODULE)
set(CMAKE_CXX_CREATE_SHARED_MODULE ${CMAKE_CXX_CREATE_SHARED_LIBRARY})
endif()
# Create a static archive incrementally for large object file counts.
# If CMAKE_CXX_CREATE_STATIC_LIBRARY is set it will override these.
if(NOT DEFINED CMAKE_CXX_ARCHIVE_CREATE)
set(CMAKE_CXX_ARCHIVE_CREATE "<CMAKE_AR> qc <TARGET> <LINK_FLAGS> <OBJECTS>")
endif()
if(NOT DEFINED CMAKE_CXX_ARCHIVE_APPEND)
set(CMAKE_CXX_ARCHIVE_APPEND "<CMAKE_AR> q <TARGET> <LINK_FLAGS> <OBJECTS>")
endif()
if(NOT DEFINED CMAKE_CXX_ARCHIVE_FINISH)
set(CMAKE_CXX_ARCHIVE_FINISH "<CMAKE_RANLIB> <TARGET>")
endif()
# compile a C++ file into an object file
if(NOT CMAKE_CXX_COMPILE_OBJECT)
set(CMAKE_CXX_COMPILE_OBJECT
"<CMAKE_CXX_COMPILER> <DEFINES> <INCLUDES> <FLAGS> -o <OBJECT> -c <SOURCE>")
endif()
if(NOT CMAKE_CXX_LINK_EXECUTABLE)
set(CMAKE_CXX_LINK_EXECUTABLE
"<CMAKE_CXX_COMPILER> <FLAGS> <CMAKE_CXX_LINK_FLAGS> <LINK_FLAGS> <OBJECTS> -o <TARGET> <LINK_LIBRARIES>")
endif()
mark_as_advanced(
CMAKE_VERBOSE_MAKEFILE
CMAKE_CXX_FLAGS
CMAKE_CXX_FLAGS_RELEASE
CMAKE_CXX_FLAGS_RELWITHDEBINFO
CMAKE_CXX_FLAGS_MINSIZEREL
CMAKE_CXX_FLAGS_DEBUG)
set(CMAKE_CXX_INFORMATION_LOADED 1)
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