dca9c33abc Tests: Remove old IPO test
c856d4556b bindexplib: supporting llvm bitcode formats using llvm-nm
079b8e2916 Clang: prefer lld-link over link.exe
6e3655db2c Clang: add LTO support for GNU-command line clang on windows
Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !3527
This change modifies how CMAKE_RC_COMPILER is configured to improve
the out-of-box experience for developers using Clang on Windows.
The previous behavior was to require the user to explicitly specify
the resource compiler when CMake was called. The new behavior
is to automatically attempt to locate the MSVC rc binary and use that
if it's found. If rc is not available, CMake will now fall back to
Clang's llvm-rc binary.
With this change in place, trivial C/C++ programs can be generated
with Ninja and Clang on Windows without running into errors about
a missing resource compiler.
Fixes: #19318
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names and years are hard to maintain and often out-of-date or plain wrong.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.
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.
Brad King