[PATCH] D61694: Boilerplate for producing XCOFF object files from the PowerPC backend.

Hal Finkel via Phabricator via llvm-commits llvm-commits at lists.llvm.org
Wed May 29 07:55:41 PDT 2019

hfinkel added inline comments.

Comment at: llvm/lib/MC/XCOFFObjectWriter.cpp:68
+  // Timestamp converted to an int32_t.
+  W.write<int32_t>(Now);
+  // Byte Offset to the start of the symbol table.
sfertile wrote:
> hfinkel wrote:
> > Will the tools on AIX complain if this is 0? Our general policy is that the compiler's output should be deterministic/reproducible and this breaks that. Looks like D23934 was never finished, but this value should be tied to that (once it's finished).
> > 
> No a zero value should be fine. Is the goal the compiler always produces reproducible output by default, or just that we can enable reproducible output with an option?
Interesting question. I'd say by default, but I don't know that we've had a situation before where the platform default is to produce non-reproducible outputs at a low level (e.g., in the object-file format).

I recommend that we just set this to zero for now, and then have a separate discussion on how to change this later as necessary and/or desired.

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