[PATCH] D155716: [clang][CodeGen] Introduce `-frecord-command-line` for MachO

[Antonio Frighetto via Phabricator via cfe-commits]

antoniofrighetto added a comment.

Thanks a lot for the reviews and for pointing out clang tests as well, there was a minor update to do there too!



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Comment at: llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp:1424
+MCSection *TargetLoweringObjectFileMachO::getSectionForCommandLines() const {
+  return getContext().getMachOSection("__TEXT", "__command_line", 0,
+                                      SectionKind::getReadOnly());
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sgraenitz wrote:
> Can we put it in `__DATA`?
> 
> Also the [[ https://github.com/llvm/llvm-project/blob/release/16.x/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp#L1160 | ELF implementation notes ]] that it "attempts to mimic GCC's switch of the same name" and thus calls the section `.GCC.command.line`. I guess we cannot use the dots in MachO, but should we add a `gcc` prefix?
Whilst I agree it should be better to distinguish this from executable data, I think this should live as read-only data, which `__TEXT` is traditionally for.

Following MachO conventions, I first tried `__gcc_command_line`, but the [[ https://github.com/llvm/llvm-project/blob/main/llvm/include/llvm/BinaryFormat/MachO.h#L587 | section name ]] is restricted to 16 chars, and I'm not sure adding more bytes for the name is worth the change (thus I thought we'd prefer `__command_line` over `__gcc_cmd_line`).


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