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glibc_multi: add output "static"

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This change enables static compilation with glibc in a multilib setup. For
building a nix shell the output can now be referenced as follows:

devShells.default = pkgs.mkShell {
    packages = [
        pkgs.glibc_multi.static
    ];
};

In the implementation I was forced to make two design decisions:
1. The directory `$static/lib64` has to be a "real" directory and not a symlink.
   Otherwise, the path to this directory is not added to $NIX_LDFLAGS, which in
   turn causes the files to not be visible to gcc and ld during the build
   process (for details see `pkgs/build-support/bintools-wrapper/setup-hook.sh`
   line 16).
2. The directories `$static/lib` and `$static/lib64` have to contain symlinks
   to both the files used for static and for dynamic linking (i.e. the outputs
   of `static` and `out` of the 32 and 64 bit variant of glibc). Without this,
   dynamic linking still works, however the resulting binaries will segfault.
This commit is contained in:
Tim 2025-02-09 22:54:29 +01:00 committed by Alyssa Ross
parent 64949102ca
commit eaee7b7a45
1 changed files with 11 additions and 1 deletions
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12
pkgs/development/libraries/glibc/multi.nix
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@ -16,7 +16,8 @@ runCommand "${nameVersion.name}-multi-${nameVersion.version}"
"out"
"bin"
"dev"
]; # TODO: no static version here (yet)
"static"
];
passthru = {
libgcc = lib.lists.filter (x: x != null) [
(glibc64.libgcc or null)
@ -42,4 +43,13 @@ runCommand "${nameVersion.name}-multi-${nameVersion.version}"
cp -rs '${glibc32.dev}'/include "$dev/"
chmod +w -R "$dev"
cp -rsf '${glibc64.dev}'/include "$dev/"
mkdir -p "$static/lib" "$static/lib64"
# create symlinks for files used for dynamic linking
# -> removing this will cause dynamically linked programs to segfault
cp -rs '${glibc32.out}'/lib/* "$static/lib"
cp -rs '${glibc64.out}'/lib/* "$static/lib64"
# create symlinks for files used for static linking
cp -rs '${glibc32.static}'/lib/* "$static/lib"
cp -rs '${glibc64.static}'/lib/* "$static/lib64"
''