[llvm-bugs] [Bug 45913] New: LLD should not error out on "-plugin-opt=Os"

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=45913

            Bug ID: 45913
           Summary: LLD should not error out on "-plugin-opt=Os"
           Product: lld
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: ELF
          Assignee: unassignedbugs at nondot.org
          Reporter: manojgupta at google.com
                CC: george.burgess.iv at gmail.com, llvm-bugs at lists.llvm.org,
                    maskray at google.com, smithp352 at googlemail.com

(Also see https://bugs.chromium.org/p/chromium/issues/detail?id=1082378)

Clang passes "-plugin-opt=Os" to LLD when "-Os" is passed to clang in lto or
thnlto mode. LLD however does not like it.

$ clang -o main foo.o -Os -flto=thin  -fuse-ld=lld -v

ld.lld: error: -plugin-opt=Os: number expected, but got 's'
clang-11: error: linker command failed with exit code 1 (use -v to see
invocation)

"-Os" is a fairly common compiler option and may not be easy to remove from
build flags. It'd be nice if LLD does not error out in this case.

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