--- Log opened Tue Jan 14 00:00:06 2020
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08:32 < dongcarl> fanquake: ?
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13:51 < fanquake> dongcarl you can pass -Wl,O<N> through to most linkers, and it enables certain optimisations. -O2 turns on a few extra things on lld and ld.gold. Any -O value into ld turns on at least one extra optimisation.
13:52 < fanquake> Going to put up a PR soon.
13:55 < dongcarl> Oh dope
13:56 < dongcarl> Does gcc not do this automatically?
14:06 < fanquake> dongcarl from what I can tell it doesn't. ld is -O0 by default. lld is -O1 by default, meaning we can pass -O2.
14:09 < fanquake> Cannot tell from https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html wether it passes the compile time optimization flags you specify through to the linker by default
14:11 < fanquake> I know in Chromium they pass -O2, and claim it turns on some extra optimizations. "enables string tail merge optimization in gold and lld"
14:12 < fanquake> Great thing about open source is I could just read the lld source and check that's actually whats happening
14:13 < fanquake> i.e https://github.com/llvm/llvm-project/blob/master/lld/ELF/SyntheticSections.cpp#L3230
14:13 < dongcarl> nice
14:27 < kanzure> which one is gold?
14:29 < fanquake> kanzure https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=blob_plain;f=gold/README;hb=refs/heads/master
14:29 < fanquake> It was written as a replacement for the original ld
14:35 < kanzure> oh okay.
14:58 < dongcarl> Might be of interest to people here: https://www.phoronix.com/scan.php?page=news_item&px=Linux-Time-Namespace-Coming
15:50 < fanquake> dongcarl added to the reading list
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--- Log closed Wed Jan 15 00:00:08 2020