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CMake/Modules/Compiler/Clang.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copyright/license notice headers that spell out copyright holder names and years are hard to maintain and often out-of-date or plain wrong.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.
Clang: Split Compiler/Clang* modules out from GNU (#13550) While Clang presents an almost identical interface to GNU there will be some differences. Split the compiler information modules to allow separate rules for Clang. Start by loading the GNU rules but leave a place to add Clang-specific information.
2012-09-19 22:04:13 +04:00
# This module is shared by multiple languages; use include blocker.
if(__COMPILER_CLANG)
return()
endif()
set(__COMPILER_CLANG 1)
Avoid if() quoted auto-dereference when checking for "MSVC" When testing CMAKE_<LANG>_COMPILER_ID values against "MSVC", do not allow the definition of the "MSVC" variable to be expanded.
2014-11-19 12:21:27 +03:00
if("x${CMAKE_C_SIMULATE_ID}" STREQUAL "xMSVC"
OR "x${CMAKE_CXX_SIMULATE_ID}" STREQUAL "xMSVC")
Clang: Support Windows variants for GNU and MSVC (#13035, #14458) Teach the compiler identification preprocessor tests to report when Clang simulates MSVC, and what version. If not MSVC, assume GNU. Teach compiler information modules Clang-(C|CXX) to recognize when Clang simulates MSVC and skip loading the GNU information. Teach the Windows-MSVC platform information to recognize when it is loaded as the simulated compiler and use that version information instead of the real compiler's (different) version scheme. Add platform modules Windows-Clang-(C|CXX) and support module Windows-Clang to load either Windows-MSVC or Windows-GNU and wrap the corresponding information macros.
2013-10-04 18:13:08 +04:00
macro(__compiler_clang lang)
endmacro()
else()
include(Compiler/GNU)
Clang: Split Compiler/Clang* modules out from GNU (#13550) While Clang presents an almost identical interface to GNU there will be some differences. Split the compiler information modules to allow separate rules for Clang. Start by loading the GNU rules but leave a place to add Clang-specific information.
2012-09-19 22:04:13 +04:00
Clang: Support Windows variants for GNU and MSVC (#13035, #14458) Teach the compiler identification preprocessor tests to report when Clang simulates MSVC, and what version. If not MSVC, assume GNU. Teach compiler information modules Clang-(C|CXX) to recognize when Clang simulates MSVC and skip loading the GNU information. Teach the Windows-MSVC platform information to recognize when it is loaded as the simulated compiler and use that version information instead of the real compiler's (different) version scheme. Add platform modules Windows-Clang-(C|CXX) and support module Windows-Clang to load either Windows-MSVC or Windows-GNU and wrap the corresponding information macros.
2013-10-04 18:13:08 +04:00
macro(__compiler_clang lang)
__compiler_gnu(${lang})
set(CMAKE_${lang}_COMPILE_OPTIONS_PIE "-fPIE")
set(CMAKE_INCLUDE_SYSTEM_FLAG_${lang} "-isystem ")
set(CMAKE_${lang}_COMPILE_OPTIONS_VISIBILITY "-fvisibility=")
Update the Clang pattern to specify compiler options. In Clang 3.4, the preferred (and new) option pattern is --target=. http://thread.gmane.org/gmane.comp.compilers.clang.devel/29975 http://llvm.org/viewvc/llvm-project?view=revision&revision=184408 Clang 3.4 is not yet released, but there is a release candidate, and there is a dashboard test of Clang trunk.
2013-06-27 14:58:58 +04:00
if(CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 3.4.0)
set(CMAKE_${lang}_COMPILE_OPTIONS_TARGET "-target ")
set(CMAKE_${lang}_COMPILE_OPTIONS_EXTERNAL_TOOLCHAIN "-gcc-toolchain ")
else()
set(CMAKE_${lang}_COMPILE_OPTIONS_TARGET "--target=")
set(CMAKE_${lang}_COMPILE_OPTIONS_EXTERNAL_TOOLCHAIN "--gcc-toolchain=")
endif()
Clang: Support Windows variants for GNU and MSVC (#13035, #14458) Teach the compiler identification preprocessor tests to report when Clang simulates MSVC, and what version. If not MSVC, assume GNU. Teach compiler information modules Clang-(C|CXX) to recognize when Clang simulates MSVC and skip loading the GNU information. Teach the Windows-MSVC platform information to recognize when it is loaded as the simulated compiler and use that version information instead of the real compiler's (different) version scheme. Add platform modules Windows-Clang-(C|CXX) and support module Windows-Clang to load either Windows-MSVC or Windows-GNU and wrap the corresponding information macros.
2013-10-04 18:13:08 +04:00
endmacro()
endif()