https://bugs.llvm.org/show_bug.cgi?id=38305
Bug ID: 38305
Summary: LTO doesn't allow optimization by size
Product: tools
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: lto
Assignee: unassignedb...@nondot.org
Reporter: mh+l...@glandium.org
CC: llvm-bugs@lists.llvm.org
$ clang -fuse-ld=gold -o t main.c -Os -flto=thin
/usr/bin/ld.gold: fatal error: Optimization level must be between 0 and 3
clang: error: linker command failed with exit code 1 (use -v to see invocation)
(Same with -Oz)
The error message is emitted by the llvm plugin, not gold (it's in
tools/lto/lto.cpp).
Interestingly, it fails at another level when using lld:
$ clang -fuse-ld=lld -o t main.c -Os -flto=thin
/usr/lib/llvm-6.0/bin/ld.lld: error: --plugin-opt: number expected, but got 's'
clang: error: linker command failed with exit code 1 (use -v to see invocation)
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