mingmingl-llvm wrote:

> Can we ensure that `-z,keep-data-section-prefix` gets passed to the linker 
> too from the driver? Should it be part of this pull request?

I actually did wonder about it when making the changes; inferred from the 
current status, it's more canonical to let users specify linker options 
separately.

[tools::gnutools::Linker::ConstructJob](https://github.com/llvm/llvm-project/blob/1cb99036b41562b233e7bb44801202742733f5d3/clang/lib/Driver/ToolChains/Gnu.cpp#L271)
 and its caller 
[LinkerWrapper::ConstructJob](https://github.com/llvm/llvm-project/blob/4e44e8761795d4672121368929b9c99f6dbaffa7/clang/lib/Driver/ToolChains/Clang.cpp#L9223)
 [^1] constructs the linker options, and PGO linker options like  
`-keep-text-section-prefix` are not implied; toolchain users typically specify 
`-Wl,-z,keep-text-section-prefix` besides `-fprofile-use` to partition text 
sections.  

[^1]: While 'gnu' is in the namespace / filename, the functions get invoked 
when compiling a binary the common way.

https://github.com/llvm/llvm-project/pull/124991
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