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Hash : b62f36f3
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Date : 2024-03-13T23:34:55
test: nlist: make resilient against -Wl,--gc-sections With linker sections GC enabled, we get a test failure in `nlist.c`: ``` nlist: nlist.c:72: main: Assertion `rc == 0' failed. ``` This turns out to be because several sections used by the test can be discarded: ``` ld: removing unused section '.text.func_pub' in file 'nlist.o' ld: removing unused section '.bss.data_pub_uninit' in file 'nlist.o' ld: removing unused section '.data.data_pub_init' in file 'nlist.o' ``` Reproduced with `CFLAGS="-Og -fdata-sections -ffunction-sections"` and `LDFLAGS="-Wl,-O1 -Wl,--as-needed -Wl,--gc-sections -Wl,-z,start-stop-gc"`. Additionally, `LDFLAGS="... -Wl,--print-gc-sections"` can help with diagnosing which sections get removed. We already mark these symbols as `used`, but we need `retain` [0] for them to survive linker GC too. [0] https://releases.llvm.org/18.1.0/tools/lld/docs/ELF/start-stop-gc.html#annotate-c-identifier-name-sections Closes: !29 Signed-off-by: Sam James <sam@gentoo.org> Signed-off-by: Guillem Jover <guillem@hadrons.org>
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