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A .la file specifies linker flags to link with the library it describes. Its "dependency_libs" field lists the libraries that this library depends upon. This list often contains "-l" flags without corresponding "-L" flags. Many packages in Nixpkgs deal with this in one of these ways: - delete .la file [1] - clear dependency_libs [2] - add -L flags to dependency_libs [3] - propagate dependencies [4] Sometimes "dependency_libs" contain wrong "-L" flags pointing to the "dev" output with headers rather than to the main output with libraries. They have to be edited or deleted to reduce closure size [5]. Deleting .la files is often but not always safe [6]. Atomatically deleting as many of them as possible is complex [7]. Deleting .la files that describe shared rather than static libraries is probably safe; but clearing their "dependency_libs" field achieves the same effect with less potential for unintended consequences. This is the approach that may be enabled for all Nixpkgs. [1]2a79d296d3[2]c83a530985[3]9e0dcf3bd9[4]01134e698f[5]f6c73f1e37[6] https://wiki.gentoo.org/wiki/Project:Quality_Assurance/Handling_Libtool_Archives [7] https://github.com/gentoo/gentoo/blob/fb1f2435/eclass/ltprune.eclass
22 lines
930 B
Bash
22 lines
930 B
Bash
# Clear dependency_libs in libtool files for shared libraries.
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# Shared libraries already encode their dependencies with locations. .la
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# files do not always encode those locations, and sometimes encode the
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# locations in the wrong Nix output. .la files are not needed for shared
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# libraries, but without dependency_libs they do not hurt either.
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fixupOutputHooks+=(_pruneLibtoolFiles)
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_pruneLibtoolFiles() {
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if [ "$dontPruneLibtoolFiles" ]; then
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return
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fi
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# Libtool uses "dlname" and "library_names" fields for shared libraries and
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# the "old_library" field for static libraries. We are processing only
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# those .la files that do not describe static libraries.
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find "$prefix" -type f -name '*.la' \
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-exec grep -q '^# Generated by libtool' {} \; \
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-exec grep -q "^old_library=''" {} \; \
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-exec sed -i {} -e "/^dependency_libs='[^']/ c dependency_libs='' #pruned" \;
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}
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