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Brane2
n00b
Joined: 03 Jul 2011
Posts: 44
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 Posted: Sat Jul 17, 2021 11:59 am Post subject: Using lld as default linker for all packages ? |
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I have latest gcc ( 11.1.0-r2), clang/llvm/lld(12.0.1) and have tried to use lld as default linker.
And use some of its unique linking options ( --icf=safe,--print-icf-sections, --lto-Ox etc).
I have -fuse-ld=lld in COMMON options that are included into CFLAGS/CXXFLAGS and LDFLAGS
And I have "LD=/usr/bin/ld.lld"
But with this, every emerge fails with lld complaining that it can't find symbol of program entry point ( main function).
So, my relevant vars in make.conf look like this:
| Quote: | COMMON_FLAGS="-march=native -O3 -flto=16 -pipe -fuse-ld=lld"
CFLAGS="${COMMON_FLAGS}"
CXXFLAGS="${COMMON_FLAGS}"
LD=/usr/bin/ld.lld
LDFLAGS="${COMMON_FLAGS} -Wl,--flto-O3,-O3 -Wl,--sort-common,--as-needed -Wl,--gc-sections,--print-gc-sections -Wl,icf=safe,print-.icf-sections" |
But even trying to compile lld itself with that fails with:
| Quote: |
ld.lld: error: undefined symbol: main
rerenced by /usr/lib/x86_64-pc-linux-gnu/11.1.0/../../../../lib64/Scrt1.o:(start)
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Is there some other trick to it ?
Or perhaps it isn't meant to work yet with gcc in common case ?
It fails in this way even if leave LDFLAGS empty...
UPDATE: I took a hint from footnote of:
[gcc link options](https://gcc.gnu.org/onlinedocs/gcc/Link-Options.html)
adding `-shared` to COMMON_FLAGS seems to be working.
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Brane2
n00b
Joined: 03 Jul 2011
Posts: 44
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| Posted: Sun Jul 18, 2021 2:20 pm Post subject: Re: Using lld as default linker for all packages ? |
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Errm, scratch that. Lld wasn't meant to be used with gcc in LTO mode.
It compiled lld itself, but failed with basically everything else.
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