buildsys: always link gap against libgap#5780
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ChrisJefferson
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Aug 28, 2024
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... even the copy we don't install system wide. On macOS this allows us an annoying issue with the linker flags used by e.g. gac for building kernel extensions: by always linking them against libgap we don't need to use a flat namespace, nor rely on a bundle loader (which breaks if you try to load the kernel extension in another binary using libgap).
Centralize how GAP links against libgap and carries runtime search paths for the build tree and installed binaries. This keeps the build-tree Linux case working while preserving the always-link-against-libgap setup for gac and installed tools. Normalize compiler-expanded file paths in out-of-tree builds so installed libgap binaries no longer embed absolute source or build paths. The install test no longer needs LD_LIBRARY_PATH or DYLD_LIBRARY_PATH once the binaries carry the right loader metadata themselves. AI-assisted with Codex for build-system edits and Linux verification. Co-authored-by: Codex <codex@openai.com>
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... even the copy we don't install system wide.
On macOS this allows us an annoying issue with the linker flags used by e.g.
gac for building kernel extensions: by always linking them against libgap we
don't need to use a flat namespace, nor rely on a bundle loader (which breaks
if you try to load the kernel extension in another binary using libgap).
However, this is not yet working on Linux at all, as there it won't find the not-yet-installed libgap:
In principle this can be dealt with but I don't have time to do that right now, but I also didn't want to let this fragment get lost, so this PR will remind me to finish this one day (if someone would like to help out, that'd be welcome, too).
Alternatively one could restrict this change to macOS.