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alecStewart1
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Joined: 03 Jul 2022
Posts: 174
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 Posted: Sun Oct 13, 2024 3:27 am Post subject: [S] media-libs/libplacebo: not compiling w/ bootstrap Clang |
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Hey gang,
I I tried moving to using clang as my compiler (for most things) and I even was able to bootstrap it (with llvm-unwind) and it seems like some libraries aren't quite working the same. Probably because of some environment variables I set in package.env or another env config file.
=media-libs/libplacebo-7.349.0 is one of those. The following error is thrown:
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Header "vulkan/vulkan_core.h" has symbol "VK_VERSION_1_3" with dependency vulkan: NO
../libplacebo-v7.349.0/src/vulkan/meson.build:17:28: ERROR: Feature vulkan cannot be enabled: vulkan.h was not found on the system, nor inside `3rdparty/Vulkan-Headers`. Please run `git submodule update --init` followed by `meson --wipe`.
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But...vulkan is installed on my system, and there's a header file at /usr/include/vulkan/vulkan.h. I compile all of the Vulkan libraries and Meson with the bootstrapped Clang/LLVM system, so I don't really know what's happening.
emerge --info
build.log for =media-libs/libplacebo-7.349.0
I didn't compile the vulkan libraries with any LTO which I've found to not always play well with some packages, so I can at least rule that out.
Last edited by alecStewart1 on Sun Oct 13, 2024 3:10 pm; edited 1 time in total |
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Ionen
Developer
Joined: 06 Dec 2018
Posts: 2892
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| Posted: Sun Oct 13, 2024 6:37 am Post subject: |
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This might have more to say (if not found, search for meson-log.txt, not sure if path is right for you):
/var/tmp/portage/portage/media-libs/libplacebo-7.349.0/work/libplacebo-v7.349.0-abi_x86_32.x86/meson-logs/meson-log.txt
That aside, imo you really are setting too many things -- should reduce, ideally stick to lld with clang (or at least for system-wide), and use wanted default-* USE on clang-common rather than have things like stdlib/rtlib/unwind in LDFLAGS.
fwiw clang19+mold+libplacebo[abi_x86_32] works for me, albeit I haven't tried with your flags.
Just to be sure, you don't have old vulkan headers elsewhere, right? Like in /usr/local. Finding ancient <1.3 headers would fail that test as well. |
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alecStewart1
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Joined: 03 Jul 2022
Posts: 174
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| Posted: Sun Oct 13, 2024 1:41 pm Post subject: |
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| Ionen wrote: |
This might have more to say (if not found, search for meson-log.txt, not sure if path is right for you):
/var/tmp/portage/portage/media-libs/libplacebo-7.349.0/work/libplacebo-v7.349.0-abi_x86_32.x86/meson-logs/meson-log.txt
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Here's that file. I tried using lld last time I tried to compile libplacebo and it still failed, so that's why it shows lld and the linker used.
Also here's my updated emerge --info after removing some flags and putting some of them in separate files in /etc/portage/env/
| Quote: |
That aside, imo you really are setting too many things -- should reduce, ideally stick to lld with clang (or at least for system-wide), and use wanted default-* USE on clang-common rather than have things like stdlib/rtlib/unwind in LDFLAGS.
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Oh, does the clang-common package take care of the use of the -stdlib=libstdc++ -rtlib=compiler-rt -unwindlib=libunwind linker flags? So the stdlib used will be libstdc++ when needed, the rtlib will be compiler-rt, and llvm-unwind will be used whenever unwinding needs to be done?
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fwiw clang19+mold+libplacebo[abi_x86_32] works for me, albeit I haven't tried with your flags.
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Yea, that sounds about right. 
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Just to be sure, you don't have old vulkan headers elsewhere, right? Like in /usr/local. Finding ancient <1.3 headers would fail that test as well.
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At least for the file vulkan.h this is all that's on my system
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/usr/include/libplacebo/vulkan.h
/usr/include/SDL2/SDL_vulkan.h
/usr/include/libavutil/hwcontext_vulkan.h
/usr/include/vulkan/vulkan.hpp
/usr/include/vulkan/vulkan_handles.hpp
/usr/include/vulkan/vulkan_hash.hpp
/usr/include/vulkan/vulkan_hpp_macros.hpp
/usr/include/vulkan/vulkan.h
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EDIT:
Here's my package.env as well. To clarify, I haven't tested if everything in it works. Hopefully the configuration like "with-" and "use-" are clear enough to understand what they do (I tried to make them so for cases like this). |
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alecStewart1
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Joined: 03 Jul 2022
Posts: 174
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| Posted: Sun Oct 13, 2024 1:56 pm Post subject: |
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Uh, okay, once I stripped away some of my LDFLAGS, it compiled fine.
I'm guessing one of -stdlib=libstdc++ -rtlib=compiler-rt -unwindlib=libunwind -Wl,-z,relro,-z,now was causing the issue.
I still have this question though:
| alecStewart1 wrote: |
Oh, does the clang-common package take care of the use of the -stdlib=libstdc++ -rtlib=compiler-rt -unwindlib=libunwind linker flags? So the stdlib used will be libstdc++ when needed, the rtlib will be compiler-rt, and llvm-unwind will be used whenever unwinding needs to be done?
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Ionen
Developer
Joined: 06 Dec 2018
Posts: 2892
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| Posted: Sun Oct 13, 2024 2:00 pm Post subject: |
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meson-log.txt shows the error, it's being pedantic and error'ing out because of it (thing is that it's compiling C code but being passed an option intended for C++): | Code: | | clang: error: argument unused during compilation: '-stdlib=libstdc++' [-Werror,-Wunused-command-line-argument] |
And yes, clang-common takes care of these through /etc/clang config files (not added to LDFLAGS itself), e.g. with USE="default-compiler-rt default-lld llvm-libunwind", for libstdc++ it's already the default so there's nothing to set. |
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alecStewart1
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Joined: 03 Jul 2022
Posts: 174
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| Posted: Sun Oct 13, 2024 3:11 pm Post subject: |
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| Ionen wrote: | meson-log.txt shows the error, it's being pedantic and error'ing out because of it (thing is that it's compiling C code but being passed an option intended for C++): | Code: | | clang: error: argument unused during compilation: '-stdlib=libstdc++' [-Werror,-Wunused-command-line-argument] |
And yes, clang-common takes care of these through /etc/clang config files (not added to LDFLAGS itself), e.g. with USE="default-compiler-rt default-lld llvm-libunwind", for libstdc++ it's already the default so there's nothing to set. |
Ah ha. Well, awesome! Thanks for the help. |
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