[llvm-bugs] [Bug 42101] New: cmake Minsizerel with LTO fails on Linux

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42101

            Bug ID: 42101
           Summary: cmake Minsizerel with LTO fails on Linux
           Product: Build scripts
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: cmake
          Assignee: unassignedbugs at nondot.org
          Reporter: milind at uber.com
                CC: llvm-bugs at lists.llvm.org

Configure llvm project with Minsizerel and enable LTO and set clang/clang++ as
the compiler and LLD as the linker (example below).

cmake -DCMAKE_BUILD_TYPE=Minsizerel -DLLVM_ENABLE_LTO=Full 
-DLLVM_ENABLE_PROJECTS=clang -DCMAKE_C_COMPILER=clang
-DCMAKE_CXX_COMPILER=clang++ -DLLVM_ENABLE_LLD=1  -G "Ninja" ../llvm

The build fails with the following error:

ld.lld: error: -plugin-opt=Os: number expected, but got 's'
clang-9: error: linker command failed with exit code 1 (use -v to see
invocation)

Clearly, the -Os flag passed to the linker is not getting recognized. If the
linker does not support -Os, the build scripts should make sure that they do
not pass -Os down to the linker.

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