Avoid rebuilding check-symbols artifacts
#551
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Makefile
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| # Collect symbol information. | ||
| # | ||
| "$(NM)" --defined-only \ | ||
| $(SYSROOT_LIB)/libc.a $(SYSROOT_LIB)/libwasi-emulated-*.a $(SYSROOT_LIB)/*.o \ |
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@sunfishcode: one thing that doesn't make a ton of sense is why we collect the defined symbols for libc.a and libwasi-emulated-*.a but then when we collect the undefined symbols we switch up which files we're looking at: libc.a and libc-*.a. I would have expected these to be the same files in both cases but that results in slightly different undefined-symbols.txt (e.g., __floatunsitf).
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We don't want to just check *.a and *.o in both places?
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That's a good point. I can't think of a reason offhand why they're different.
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Ok, a0cbb41 checks all of the *.a and *.o files, which is probably what we want (?). Some things I noticed:
- we don't really check any
*.sofiles ever libsetjump.ais conditioned by$(BUILD_LIBSETJMP)which is on by default; if someone were to turn this off, we would see check symbols errors (like we do in CI whenBUILD_LIBSETJMP=nofor the "old LLVM" build)
Like other recent PRs, this change uses true file dependencies to avoid rebuilding the files used to check which symbols are defined or not. The true `git diff` test is still run each time, however.
Previously, we generated the defined and undefined symbol lists from different sets of `sysroot/lib` artifacts. This uses all static artifacts that are built, `*.a` and `*.o`, to increase coverage of the symbols wasi-libc is publishing.
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| |sed 's/.* [[:upper:]] //' \ | ||
| |LC_ALL=C sort \ | ||
| |uniq \ | ||
| > "$@" |
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Also, I can move all these to separate scripts if we want (here or in a different PR).
Like other recent PRs, this change uses true file dependencies to avoid rebuilding the files used to check which symbols are defined or not. The true
git difftest is still run each time, however.