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Could not map installation path to an equivalent wheel directory#765

Answeredbydnicolodi
moi15moi asked this question inQ&A
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I think I have the same issue has#673, because I get this error:meson-python: error: Could not map installation path to an equivalent wheel directory: '{libdir_static}/libavutil.a'

libavutil isn't a direct dependency of my project. My project depends onbestsource which depend onffmpeg (libavutil, libavcodec, libavformat).

From what I can see in the doc, I think I simply need to use:https://mesonbuild.com/meson-python/how-to-guides/shared-libraries.html#shared-library-from-subproject, but even with my 2 attempts, it didn't work.

Attempt 1

meson.build

project('example','cpp',version:'0.1.0',default_options: ['cpp_std=c++17'],)py=import('python').find_installation(pure:false)pybind11_dep=dependency('pybind11')# See https://mesonbuild.com/meson-python/how-to-guides/shared-libraries.html#shared-library-from-subproject# Maybe the only_install_main_lib will propagate to dependency like ffmpeg?bestsource_subproj=subproject('bestsource',default_options: {# This is a custom option - if it doesn't exist, can you add it# upstream or in WrapDB?'only_install_main_lib':true,    })bestsource_dep= bestsource_subproj.get_variable('bestsource_dep')subdir('video_timestamps')

video_timestamps\meson.build

python_sources= ['__init__.py','_version.py','abc_timestamps.py','fps_timestamps.py','rounding_method.py','text_file_timestamps.py','time_type.py','time_unit_converter.py','timestamps_file_parser.py','video_timestamps.py']py.install_sources(  python_sources,pure:false,subdir:'video_timestamps')py.extension_module('best_source','best_source.cpp',install:true,dependencies: [pybind11_dep, bestsource_dep],)

Attempt 2

meson.build

project('example','cpp',version:'0.1.0',default_options: ['cpp_std=c++17'],)py=import('python').find_installation(pure:false)pybind11_dep=dependency('pybind11')# See https://mesonbuild.com/meson-python/how-to-guides/shared-libraries.html#shared-library-from-subprojectffmpeg_subproj=subproject('ffmpeg',default_options: {# This is a custom option - if it doesn't exist, can you add it# upstream or in WrapDB?'only_install_main_lib':true,    })libavformat_dep= ffmpeg_subproj.get_variable('libavformat_dep')libavcodec_dep= ffmpeg_subproj.get_variable('libavcodec_dep')libavutil_dep= ffmpeg_subproj.get_variable('libavutil_dep')# I'm not sure if bestsource will use the variable libavformat_dep, libavcodec_dep and libavutil_depbestsource_dep=dependency('bestsource')subdir('video_timestamps')

video_timestamps\meson.build

python_sources= ['__init__.py','_version.py','abc_timestamps.py','fps_timestamps.py','rounding_method.py','text_file_timestamps.py','time_type.py','time_unit_converter.py','timestamps_file_parser.py','video_timestamps.py']py.install_sources(  python_sources,pure:false,subdir:'video_timestamps')py.extension_module('best_source','best_source.cpp',install:true,dependencies: [pybind11_dep, bestsource_dep],)

Note that these are the wrap file I used:

ffmpeg.wrap

[wrap-git]directory = ffmpegurl = https://gitlab.freedesktop.org/gstreamer/meson-ports/ffmpeg.gitrevision = meson-7.1depth = 1[provide]libavformat = libavformat_deplibavcodec = libavcodec_deplibavutil = libavutil_dep

bestsource.wrap

[wrap-git]url = https://github.com/vapoursynth/bestsourcerevision = R12clone-recursive = true[provide]bestsource = bestsource_dep

Do you have an idea of what I could do wrong?

PS: I don't care about using a shared lib of static lib. It's just that I was getting another error with static lib.

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I think the issue comes from the use of inline assembly inffmpeg when building a static library. If you do that, you need to compile objects linking toffmpeg with-Wl,-Bsymbolichttps://ffmpeg.org/platform.html#Advanced-linking-configuration Don't ask me what that flag does or why it is needed.

Replies: 1 comment 3 replies

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From what I can see in the doc, I think I simply need to use:https://mesonbuild.com/meson-python/how-to-guides/shared-libraries.html#shared-library-from-subproject, but even with my 2 attempts, it didn't work.

As the documentation says, that only works if the subproject has support for that option. I'm quite sure the subprojects you are using do not implement it. However, if the only thing that the subproject installs that you don't want it the static library, you may simply disable building the static library passing--default-library=shared to the setup command.

I don't care about using a shared lib of static lib.

Then, the easiest is to compile all components statically and do not install the subprojects, as explained herehttps://mesonbuild.com/meson-python/how-to-guides/shared-libraries.html#static-library-from-subproject

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3 replies
@moi15moi
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Then, the easiest is to compile all components statically and do not install the subprojects, as explained herehttps://mesonbuild.com/meson-python/how-to-guides/shared-libraries.html#static-library-from-subproject

Ok, then I will explain the error that I was getting.
I previously tried to add the snippet you shared, but I was getting this error:

FAILED: video_timestamps/best_source.cpython-312-x86_64-linux-gnu.so      c++-o video_timestamps/best_source.cpython-312-x86_64-linux-gnu.so video_timestamps/best_source.cpython-312-x86_64-linux-gnu.so.p/best_source.cpp.o-Wl,--as-needed-Wl,--allow-shlib-undefined-Wl,-O1-shared-fPIC-Wl,--start-group subprojects/bestsource/libbestsource.a subprojects/ffmpeg/libavutil.a subprojects/ffmpeg/libavcodec.a subprojects/ffmpeg/libswresample.a subprojects/ffmpeg/libavformat.a subprojects/xxHash-0.8.3/libxxhash.a-pthread-lm-latomic/usr/lib/x86_64-linux-gnu/libz.a-lbz2-latomic-latomic-latomic-latomic-lbz2-Wl,--end-group/usr/bin/ld: subprojects/ffmpeg/libavcodec.a(libavcodec_x86_cavsdsp.c.o):warning: relocation against `ff_pw_5' in read-only section `.text'/usr/bin/ld: subprojects/ffmpeg/libavcodec.a(libavcodec_x86_cavsdsp.c.o): relocation R_X86_64_PC32 against symbol `ff_pw_5' can not be used when making a shared object; recompilé avec -fPIC/usr/bin/ld: final linkfailed: bad valuecollect2:error: ld returned1 exit statusninja: buildstopped: subcommand failed.      [end of output]

So, I tried to forceb_staticpic to true like this, but I am getting the same error.

[tool.meson-python.args]setup = ["--default-library=static","--wrap-mode=forcefallback","-Dbestsource:enable_plugin=false","-Dffmpeg:tests=disabled","-Dffmpeg:b_staticpic=true",]install = ['--skip-subprojects']

I think that's more a meson question than a meson-python question. If so, I'm sorry if I am not in the right place.

@dnicolodi
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I think the issue comes from the use of inline assembly inffmpeg when building a static library. If you do that, you need to compile objects linking toffmpeg with-Wl,-Bsymbolichttps://ffmpeg.org/platform.html#Advanced-linking-configuration Don't ask me what that flag does or why it is needed.

Answer selected bymoi15moi
@moi15moi
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You're totally right!
With this, it compiles without any error

py.extension_module('best_source','best_source.cpp',install:true,dependencies: [pybind11_dep, bestsource_dep],link_args: ['-Wl,-Bsymbolic'],)
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