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CMake/Modules/Platform/CYGWIN-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copyright/license notice headers that spell out copyright holder names and years are hard to maintain and often out-of-date or plain wrong.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(__CYGWIN_COMPILER_GNU)
return()
endif()
set(__CYGWIN_COMPILER_GNU 1)
Do not export all symbols from DLLs on Cygwin In commit "use export all symbols on cygwin" (2003-01-21) we started passing -Wl,--export-all-symbols when linking shared libraries. Now cygwin exports all symbols automatically if no symbols are explicitly exported. When symbols are explicitly exported we want to honor that narrow interface. Therefore this flag should not be passed. Change based on patch from issue #10122.
2010-01-21 23:03:32 +03:00
# TODO: Is -Wl,--enable-auto-import now always default?
Honor CMAKE_*_LINKER_FLAGS[_<CONFIG>]_INIT set in toolchain files Document these variables. Change our convention for setting these variables from: set(CMAKE_EXE_LINKER_FLAGS_INIT "...") to string(APPEND CMAKE_EXE_LINKER_FLAGS_INIT " ...") so that any value previously set by a toolchain file will be used.
2016-07-13 22:06:23 +03:00
string(APPEND CMAKE_EXE_LINKER_FLAGS_INIT " -Wl,--enable-auto-import")
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_CREATE_WIN32_EXE "-mwindows")
set(CMAKE_GNULD_IMAGE_VERSION
"-Wl,--major-image-version,<TARGET_VERSION_MAJOR>,--minor-image-version,<TARGET_VERSION_MINOR>")
Add support for windres to cygwin.
2010-12-23 23:53:47 +03:00
set(CMAKE_GENERATOR_RC windres)
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
macro(__cygwin_compiler_gnu lang)
# Binary link rules.
set(CMAKE_${lang}_CREATE_SHARED_MODULE
"<CMAKE_${lang}_COMPILER> <LANGUAGE_COMPILE_FLAGS> <CMAKE_SHARED_MODULE_${lang}_FLAGS> <LINK_FLAGS> <CMAKE_SHARED_MODULE_CREATE_${lang}_FLAGS> -o <TARGET> ${CMAKE_GNULD_IMAGE_VERSION} <OBJECTS> <LINK_LIBRARIES>")
set(CMAKE_${lang}_CREATE_SHARED_LIBRARY
"<CMAKE_${lang}_COMPILER> <LANGUAGE_COMPILE_FLAGS> <CMAKE_SHARED_LIBRARY_${lang}_FLAGS> <LINK_FLAGS> <CMAKE_SHARED_LIBRARY_CREATE_${lang}_FLAGS> -o <TARGET> -Wl,--out-implib,<TARGET_IMPLIB> ${CMAKE_GNULD_IMAGE_VERSION} <OBJECTS> <LINK_LIBRARIES>")
set(CMAKE_${lang}_LINK_EXECUTABLE
"<CMAKE_${lang}_COMPILER> <FLAGS> <CMAKE_${lang}_LINK_FLAGS> <LINK_FLAGS> <OBJECTS> -o <TARGET> -Wl,--out-implib,<TARGET_IMPLIB> ${CMAKE_GNULD_IMAGE_VERSION} <LINK_LIBRARIES>")
Add platform variables for position independent code flags Store in new platform variables CMAKE_${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
# No -fPIC on cygwin
set(CMAKE_${lang}_COMPILE_OPTIONS_PIC "")
set(CMAKE_${lang}_COMPILE_OPTIONS_PIE "")
set(CMAKE_SHARED_LIBRARY_${lang}_FLAGS "")
Split GNU compiler information files This moves GNU compiler flags into new-style modules Compiler/GNU-<lang>.cmake Platform/<os>-GNU-<lang>.cmake We use language-independent helper modules Compiler/GNU.cmake Platform/<os>-GNU.cmake to define macros consolidating the information.
2009-12-02 17:52:00 +03:00
# Initialize C link type selection flags. These flags are used when
# building a shared library, shared module, or executable that links
# to other libraries to select whether to use the static or shared
# versions of the libraries.
Convert CMake-language commands to lower case Ancient CMake versions required upper-case commands. Later command names became case-insensitive. Now the preferred style is lower-case. Run the following shell code: cmake --help-command-list | grep -v "cmake version" | while read c; do echo 's/\b'"$(echo $c | tr '[:lower:]' '[:upper:]')"'\(\s*\)(/'"$c"'\1(/g' done >convert.sed && git ls-files -z -- bootstrap '*.cmake' '*.cmake.in' '*CMakeLists.txt' | egrep -z -v '^(Utilities/cm|Source/kwsys/)' | xargs -0 sed -i -f convert.sed && rm convert.sed
2012-08-13 21:47:32 +04:00
foreach(type SHARED_LIBRARY SHARED_MODULE EXE)
set(CMAKE_${type}_LINK_STATIC_${lang}_FLAGS "-Wl,-Bstatic")
set(CMAKE_${type}_LINK_DYNAMIC_${lang}_FLAGS "-Wl,-Bdynamic")
Remove CMake-language block-end command arguments Ancient versions of CMake required else(), endif(), and similar block termination commands to have arguments matching the command starting the block. This is no longer the preferred style. Run the following shell code: for c in else endif endforeach endfunction endmacro endwhile; do echo 's/\b'"$c"'\(\s*\)(.\+)/'"$c"'\1()/' done >convert.sed && git ls-files -z -- bootstrap '*.cmake' '*.cmake.in' '*CMakeLists.txt' | egrep -z -v '^(Utilities/cm|Source/kwsys/)' | egrep -z -v 'Tests/CMakeTests/While-Endwhile-' | xargs -0 sed -i -f convert.sed && rm convert.sed
2012-08-13 21:50:14 +04:00
endforeach()
Split GNU compiler information files This moves GNU compiler flags into new-style modules Compiler/GNU-<lang>.cmake Platform/<os>-GNU-<lang>.cmake We use language-independent helper modules Compiler/GNU.cmake Platform/<os>-GNU.cmake to define macros consolidating the information.
2009-12-02 17:52:00 +03:00
Cygwin: Export all symbols with ENABLE_EXPORTS The ENABLE_EXPORTS property exports all symbols from executables on UNIX-like platforms, typically for use by plugins. Honor this behavior on Cygwin. See issue #10122.
2010-05-27 22:41:28 +04:00
set(CMAKE_EXE_EXPORTS_${lang}_FLAG "-Wl,--export-all-symbols")
Do not export all symbols from DLLs on Cygwin In commit "use export all symbols on cygwin" (2003-01-21) we started passing -Wl,--export-all-symbols when linking shared libraries. Now cygwin exports all symbols automatically if no symbols are explicitly exported. When symbols are explicitly exported we want to honor that narrow interface. Therefore this flag should not be passed. Change based on patch from issue #10122.
2010-01-21 23:03:32 +03:00
# TODO: Is -Wl,--enable-auto-import now always default?
set(CMAKE_SHARED_LIBRARY_CREATE_${lang}_FLAGS "${CMAKE_SHARED_LIBRARY_CREATE_${lang}_FLAGS} -Wl,--enable-auto-import")
Split GNU compiler information files This moves GNU compiler flags into new-style modules Compiler/GNU-<lang>.cmake Platform/<os>-GNU-<lang>.cmake We use language-independent helper modules Compiler/GNU.cmake Platform/<os>-GNU.cmake to define macros consolidating the information.
2009-12-02 17:52:00 +03:00
set(CMAKE_SHARED_MODULE_CREATE_${lang}_FLAGS "${CMAKE_SHARED_LIBRARY_CREATE_${lang}_FLAGS}")
RC: Enable language after C, CXX, or Fortran is enabled (#15404) The RC language is special in that it is automatically enabled on Windows-based platforms when another primary language is enabled. Move enablement of RC from early in the enablement of the other language to late. This will allow it to use information detected as part of enabling C, CXX, or Fortran.
2015-02-25 19:15:51 +03:00
RC: Simplify selection of resource compiler based on C/C++ toolchain Revert the refactoring by commit v2.8.11~105^2~1 (Ninja: use MinGW generator code in EnableLanguage, 2013-03-09) and move the MinGW- specific logic back to the "MinGW Makefiles" generator. Instead teach the platform information modules for GNU and MSVC on Windows to set the preferred RC compiler just before enabling the RC language. This way we choose the RC compiler based on the C/C++ toolchain that is actually enabled.
2015-05-07 18:43:02 +03:00
if(NOT CMAKE_RC_COMPILER_INIT)
set(CMAKE_RC_COMPILER_INIT windres)
endif()
RC: Enable language after C, CXX, or Fortran is enabled (#15404) The RC language is special in that it is automatically enabled on Windows-based platforms when another primary language is enabled. Move enablement of RC from early in the enablement of the other language to late. This will allow it to use information detected as part of enabling C, CXX, or Fortran.
2015-02-25 19:15:51 +03:00
enable_language(RC)
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()