[llvm-dev] (Thin)LTO llvm build (original) (raw)
Xinliang David Li via llvm-dev llvm-dev at lists.llvm.org
Mon Oct 3 17:22:42 PDT 2016
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For clang build, cmake flags:
-DCMAKE_EXE_LINKER_FLAGS=-fuse-ld=gold
-DCMAKE_MODULE_LINKER_FLAGS=-fuse-ld=gold
-DCMAKE_SHARED_LINKER_FLAGS=-fuse-ld=gold \
David
On Mon, Oct 3, 2016 at 5:04 PM, Carsten Mattner via llvm-dev < llvm-dev at lists.llvm.org> wrote:
On Mon, Oct 3, 2016 at 10:54 PM, Teresa Johnson <tejohnson at google.com> wrote: > > Aha - finally reproduced! The difference is using ld.bfd not > ld.gold. With that I get the same failure (using 3.9 to build 3.9 > sources):
Thanks a lot! [...] > I am not sure what the official support story is for LLVMgold.so and > ld.bfd. As mentioned earlier, the LLVM site indicates it should use > the gold linker. Can you use that while I try to figure out whether > this is something that should be supported/working? I'm probably confused but I was under the impression that I am using ld.gold due to the use of llvm-ar and llvm-ranlib and having enabled ThinLTO, which, if not strictly required with ld.bfd >=2.26, prefers ld.gold. Anyway, if I extend CFLAGS and CXXFLAGS with -fuse-ld=gold, then ld.gold terminates with /usr/bin/ld.gold: fatal error: --plugin-opt requires --plugin According to the manpage the compile driver, if passed -fuse-ld=gold, will use ld.gold, so I added that to CFLAGS and CXXFLAGS before running cmake. The above was how far I got without further insight what I might have missed. I also tried setting LD=ld.gold, but that wasn't really respected by cmake, judging by how the ld actually used complained about the unsupport -Wl options (those which you suggested for aggressive pruning and which are not universal). Which are: -Wl,--gc-sections -Wl,-plugin-opt,-function-sections -Wl,-plugin-opt,-data-sections" What's the right way to enable ld.gold explicitly when configuring llvm with cmake?
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