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CMake/Modules/Compiler/GNU.cmake

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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copyright/license notice headers that spell out copyright holder names and years are hard to maintain and often out-of-date or plain wrong.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 22:01:08 +03:00
# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.
Split GNU compiler information files This moves GNU compiler flags into new-style modules Compiler/GNU-<lang>.cmake Platform/<os>-GNU-<lang>.cmake We use language-independent helper modules Compiler/GNU.cmake Platform/<os>-GNU.cmake to define macros consolidating the information.
2009-12-02 17:52:00 +03:00
# This module is shared by multiple languages; use include blocker.
if(__COMPILER_GNU)
return()
endif()
set(__COMPILER_GNU 1)
macro(__compiler_gnu lang)
# Feature flags.
set(CMAKE_${lang}_VERBOSE_FLAG "-v")
Add platform variables for position independent code flags Store in new platform variables CMAKE_${lang}_COMPILE_OPTIONS_PIC CMAKE_${lang}_COMPILE_OPTIONS_PIE flags for position independent code generation. In almost all cases, this means duplication of the CMAKE_SHARED_LIBRARY_${lang}_FLAGS for the _PIC case and using the assumed pie equivalent for the _PIE case. Note that the GNU compiler has supported -fPIE since 3.4 and that there is no -fPIC on GNU for Windows or Cygwin. There is a possibility that the _PIE variables are not correct. However, as there is no backwards compatibility to be concerned about (as the POSITION_INDEPENDENT_CODE property is not used anywhere yet), the current state suffices.
2012-05-05 23:11:35 +04:00
set(CMAKE_${lang}_COMPILE_OPTIONS_PIC "-fPIC")
if(NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 3.4)
set(CMAKE_${lang}_COMPILE_OPTIONS_PIE "-fPIE")
endif()
GNU: Use -fvisibility on GCC 4.0 and 4.1 too This flag is needed for the `<LANG>_VISIBILITY_PRESET` target property. It has been supported since GCC 4.0, not 4.2 as we previously recorded. Fixes #16222.
2016-08-02 16:24:54 +03:00
if(NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 4.0)
Introduce target property <LANG>_VISIBILITY_PRESET This is initialized by CMAKE_<LANG>_VISIBILITY_PRESET. The target property is used as the operand to the -fvisibility= compile option with GNU compilers and clang.
2013-05-18 14:12:18 +04:00
set(CMAKE_${lang}_COMPILE_OPTIONS_VISIBILITY "-fvisibility=")
endif()
Split GNU compiler information files This moves GNU compiler flags into new-style modules Compiler/GNU-<lang>.cmake Platform/<os>-GNU-<lang>.cmake We use language-independent helper modules Compiler/GNU.cmake Platform/<os>-GNU.cmake to define macros consolidating the information.
2009-12-02 17:52:00 +03:00
set(CMAKE_SHARED_LIBRARY_${lang}_FLAGS "-fPIC")
set(CMAKE_SHARED_LIBRARY_CREATE_${lang}_FLAGS "-shared")
Add CMAKE_SYSROOT variable to set --sysroot when cross compiling. As CMAKE_ROOT_FIND_PATH can be a list, a new CMAKE_SYSROOT is introduced, which is never a list. The contents of this variable is passed to supporting compilers as --sysroot. It is also accounted for when processing implicit link directories reported by the compiler, and when generating RPATH information.
2013-04-13 16:46:57 +04:00
set(CMAKE_${lang}_COMPILE_OPTIONS_SYSROOT "--sysroot=")
Split GNU compiler information files This moves GNU compiler flags into new-style modules Compiler/GNU-<lang>.cmake Platform/<os>-GNU-<lang>.cmake We use language-independent helper modules Compiler/GNU.cmake Platform/<os>-GNU.cmake to define macros consolidating the information.
2009-12-02 17:52:00 +03:00
Provide dependency file flags to generator Causes compiler modules (currently only GNU) to set a CMAKE_DEPFILE_FLAGS_${lang} variable, which communicates to the generator the flags required to cause the compiler to create dependency files.
2011-11-15 08:39:52 +04:00
# Older versions of gcc (< 4.5) contain a bug causing them to report a missing
# header file as a warning if depfiles are enabled, causing check_header_file
# tests to always succeed. Work around this by disabling dependency tracking
# in try_compile mode.
Convert CMake-language commands to lower case Ancient CMake versions required upper-case commands. Later command names became case-insensitive. Now the preferred style is lower-case. Run the following shell code: cmake --help-command-list | grep -v "cmake version" | while read c; do echo 's/\b'"$(echo $c | tr '[:lower:]' '[:upper:]')"'\(\s*\)(/'"$c"'\1(/g' done >convert.sed && git ls-files -z -- bootstrap '*.cmake' '*.cmake.in' '*CMakeLists.txt' | egrep -z -v '^(Utilities/cm|Source/kwsys/)' | xargs -0 sed -i -f convert.sed && rm convert.sed
2012-08-13 21:47:32 +04:00
get_property(_IN_TC GLOBAL PROPERTY IN_TRY_COMPILE)
Provide dependency file flags to generator Causes compiler modules (currently only GNU) to set a CMAKE_DEPFILE_FLAGS_${lang} variable, which communicates to the generator the flags required to cause the compiler to create dependency files.
2011-11-15 08:39:52 +04:00
if(NOT _IN_TC OR CMAKE_FORCE_DEPFILES)
Ninja: Substitute <OBJECT> and <CMAKE_C_COMPILER> in depfile flags Patch by Amine Khaldi! Also, start using the -MT flag to set a target name for depfiles. This works around a bug observed in distcc, as explained in the comment. Based on a patch by Alexander Usov.
2012-03-26 07:16:15 +04:00
# distcc does not transform -o to -MT when invoking the preprocessor
# internally, as it ought to. Work around this bug by setting -MT here
# even though it isn't strictly necessary.
Ninja: Add dependencies on system-provided header files (#14914) When system-provided packages are upgraded we must re-compile sources depending on their headers. Use `-MD` instead of `-MMD` so that the generated depfiles do not exclude system headers. Suggested-by: Jussi Judin
2016-03-15 17:15:53 +03:00
set(CMAKE_DEPFILE_FLAGS_${lang} "-MD -MT <OBJECT> -MF <DEPFILE>")
Provide dependency file flags to generator Causes compiler modules (currently only GNU) to set a CMAKE_DEPFILE_FLAGS_${lang} variable, which communicates to the generator the flags required to cause the compiler to create dependency files.
2011-11-15 08:39:52 +04:00
endif()
Split GNU compiler information files This moves GNU compiler flags into new-style modules Compiler/GNU-<lang>.cmake Platform/<os>-GNU-<lang>.cmake We use language-independent helper modules Compiler/GNU.cmake Platform/<os>-GNU.cmake to define macros consolidating the information.
2009-12-02 17:52:00 +03:00
# Initial configuration flags.
Honor CMAKE_<LANG>_FLAGS[_<CONFIG>]_INIT set in toolchain files Document these variables. Change our convention for setting these variables from: set(CMAKE_C_FLAGS_INIT "...") to string(APPEND CMAKE_C_FLAGS_INIT " ...") so that any value previously set by a toolchain file will be used. Automate the conversion with: sed -i 's/set *(\(CMAKE_\(C\|CXX\|Fortran\|RC\|ASM\|${[^}]\+}\)_FLAGS\(_[^_]\+\)\?_INIT \+"\)/string(APPEND \1 /' \ Modules/Compiler/*.cmake Modules/Platform/*.cmake and follow up with some manual fixes (e.g. to cases that already meant to append). Also revert the automated changes to contexts that are not protected from running multiple times.
2016-07-05 20:35:13 +03:00
string(APPEND CMAKE_${lang}_FLAGS_INIT " ")
string(APPEND CMAKE_${lang}_FLAGS_DEBUG_INIT " -g")
string(APPEND CMAKE_${lang}_FLAGS_MINSIZEREL_INIT " -Os -DNDEBUG")
string(APPEND CMAKE_${lang}_FLAGS_RELEASE_INIT " -O3 -DNDEBUG")
string(APPEND CMAKE_${lang}_FLAGS_RELWITHDEBINFO_INIT " -O2 -g -DNDEBUG")
Factor an <INCLUDES> placeholder out of <FLAGS> in rule variables Teach the Makefile and Ninja generators to substitute for an <INCLUDES> placeholder instead of putting -I in <FLAGS>. Update our values for CMAKE_<LANG>_COMPILE_OBJECT, CMAKE_<LANG>_CREATE_ASSEMBLY_SOURCE, and CMAKE_<LANG>_CREATE_PREPROCESSED_SOURCE to place <INCLUDES> just before <FLAGS>.
2015-07-13 17:35:04 +03:00
set(CMAKE_${lang}_CREATE_PREPROCESSED_SOURCE "<CMAKE_${lang}_COMPILER> <DEFINES> <INCLUDES> <FLAGS> -E <SOURCE> > <PREPROCESSED_SOURCE>")
set(CMAKE_${lang}_CREATE_ASSEMBLY_SOURCE "<CMAKE_${lang}_COMPILER> <DEFINES> <INCLUDES> <FLAGS> -S <SOURCE> -o <ASSEMBLY_SOURCE>")
Apple: Enable -isystem for GNU Compiler >= 4 (#15953) Due to #4662 -isystem support was disabled for all GNU Compilers on Apple platforms. But the change was probably a just work around for a broken compiler on Tiger (see 10837#c27206). So we tighten the condition to only kick in for GCC versions earlier than 4. That should ensure sane behavior for Xcode 3.2 and later.
2016-02-07 22:20:02 +03:00
if(NOT APPLE OR NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 4) # work around #4462
GNU: Fix CMAKE_INCLUDE_SYSTEM_FLAG_<lang> value (#12258) Fix typo introduced by commit e28c16b4 (Split GNU compiler information files, 2009-12-02). Reported-by: Campbell Barton <ideasman42@gmail.com> Suggested-by: Michael Hertling <mhertling@online.de>
2011-06-14 01:48:20 +04:00
set(CMAKE_INCLUDE_SYSTEM_FLAG_${lang} "-isystem ")
Remove CMake-language block-end command arguments Ancient versions of CMake required else(), endif(), and similar block termination commands to have arguments matching the command starting the block. This is no longer the preferred style. Run the following shell code: for c in else endif endforeach endfunction endmacro endwhile; do echo 's/\b'"$c"'\(\s*\)(.\+)/'"$c"'\1()/' done >convert.sed && git ls-files -z -- bootstrap '*.cmake' '*.cmake.in' '*CMakeLists.txt' | egrep -z -v '^(Utilities/cm|Source/kwsys/)' | egrep -z -v 'Tests/CMakeTests/While-Endwhile-' | xargs -0 sed -i -f convert.sed && rm convert.sed
2012-08-13 21:50:14 +04:00
endif()
Split GNU compiler information files This moves GNU compiler flags into new-style modules Compiler/GNU-<lang>.cmake Platform/<os>-GNU-<lang>.cmake We use language-independent helper modules Compiler/GNU.cmake Platform/<os>-GNU.cmake to define macros consolidating the information.
2009-12-02 17:52:00 +03:00
endmacro()