[C++20] [Modules] [Driver] Support -print-library-module-manifest-path for libstdc++

Given libstdc++ has landed std module, the build systems may need clang
to find the configuration file to underst

[C++20] [Modules] [Driver] Support -print-library-module-manifest-path for libstdc++

Given libstdc++ has landed std module, the build systems may need clang
to find the configuration file to understand how to build the std
module. This patch did this. Tested with locally installed GCC-trunk.

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Fix print module manifest file for macos (#122370)

This commit fixes -print-library-module-manifest-path on macos.
Currently, this only works on linux systems. This is because on macos
systems the

Fix print module manifest file for macos (#122370)

This commit fixes -print-library-module-manifest-path on macos.
Currently, this only works on linux systems. This is because on macos
systems the library and header files are installed in a different
location. The module manifest is next to the libraries and the search
function was not looking in both places. There is also a test included.

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[clang] Improves -print-library-module-manifest-path. (#85943)

This adds a libc++ to modules.json as is currently used by libc++. When
libc++.so is not found the function will search for libc++.a a

[clang] Improves -print-library-module-manifest-path. (#85943)

This adds a libc++ to modules.json as is currently used by libc++. When
libc++.so is not found the function will search for libc++.a as
fallback.

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Reland Print library module manifest path again (#84881)

Following of https://github.com/llvm/llvm-project/pull/82160

The reason why the above PR fails is that the `--sysroot` has lower
priorit

Reland Print library module manifest path again (#84881)

Following of https://github.com/llvm/llvm-project/pull/82160

The reason why the above PR fails is that the `--sysroot` has lower
priority than the libc++ built from the same source. On the one hand, it
matches the codes behavior. We will add the built libc++ project paths
in the ToolChain class. But we will only add the path related to sysroot
in Linux class, which is derived from the ToolChain classes. So the
paths of just built libc++ is in the front of the paths relative to
sysroot. On the other hand, the behavior should be good from the higher
level. Since the just built libc++ has the same version number with the
just built clang, so it makes sense that these 2 compilers just matches.

So for patch it self, I hacked it by using resource dir in the test
since the resource dir has the higher priority, which is not strongly
correct since we won't do that in practice.

@kaz7 would you like to test on your environment to avoid this get
reverted again?

On the libc++ side, it shows that it lacks a `modules.json` file for the
just built libc++ directory. If we don't have that, it will be
problematic to use std modules from the just built clang and libc++
pair. Then it is not good. And I feel it may be problematic for future
compiler/standard library developers. So I feel this is somewhat a
libc++ issue that need to be fixed.

Also if we don't like the hacked test in the current patch, we must wait
for libc++ to fix this to proceed. But I feel this is somewhat odd since
the test of clang shouldn't dependent on libc++.

CC: @mordante

---------

Co-authored-by: Mark de Wever <koraq@xs4all.nl>

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Reland "[clang][modules] Print library module manifest path." (#82160)

This implements a way for the compiler to find the modules.json
associated with the C++23 Standard library modules.

This is

Reland "[clang][modules] Print library module manifest path." (#82160)

This implements a way for the compiler to find the modules.json
associated with the C++23 Standard library modules.

This is based on a discussion in SG15. At the moment no Standard library
installs this manifest. #75741 adds this feature in libc++.

This reverts commit 82f424f766be00b037a706a835d0a0663a2680f1.

Disables the tests on non-X86 platforms as suggested.

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[clang][modules] Print library module manifest path. (#76451)

This implements a way for the compiler to find the modules.json
associated with the C++23 Standard library modules.

This is based on

[clang][modules] Print library module manifest path. (#76451)

This implements a way for the compiler to find the modules.json
associated with the C++23 Standard library modules.

This is based on a discussion in SG15. At the moment no Standard library
installs this manifest. #75741 adds this feature in libc++.

show more ...