hubert.reinterpretcast added inline comments.
================
Comment at: llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp:2338
// Emit bytes for llvm.commandline metadata.
- emitModuleCommandLines(M);
+ // The command line metadata waas emitted earlier on XCOFF.
+ if (!TM.getTargetTriple().isOSBinFormatXCOFF())
----------------
Minor nit: Typo.
================
Comment at: llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp:2974
+ RSOS << "@(#)" << MDS->getString();
+ RSOS.write('\0');
+ }
----------------
stephenpeckham wrote:
> I would use a newline here. The AIX **what **command looks for @(#) and
> echos subsequent bytes until it sees a double quote, a backslash, a > symbol,
> newline, or null byte. The @(#) is not echoed, nor is the terminating
> character. The **what **command prints a newline after it finds a
> terminating character. This means that if the command line contains any of
> the special characters, the line will be truncated.
>
> Exception: If the @(#) is followed by "opt " or " opt ", the terminating
> characters are only a newline or null byte. This allows any of the other
> special characters to be part of the command line. It doesn't really matter
> if you use a newline or a null byte, but the legacy XL compiler uses a
> newline. The "opt" keyword should appear if the command line can contain a
> double quote, a > or a backslash.
>
> The legacy compiler also uses other keywords besides "opt", including
> "version" and "cfg". The **what** command doesn't do anything special with
> these keywords.
As mentioned offline, newline on its own has potential of ambiguity because it
can appear in command line options (null bytes cannot). If there is a
preference for newline to be present, then having a null byte after could help.
Note that `@(#)opt ` can appear on the command line too. Using `what` will have
limitations (but we should leave the possibility open for other tools/methods
to work).
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D153600/new/
https://reviews.llvm.org/D153600
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