[Bug c/61593] New: Support '#pragma mark - foo' (by simply ignoring it without warning)

[sean@rogue-research.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61593

            Bug ID: 61593
           Summary: Support '#pragma mark - foo' (by simply ignoring it
                    without warning)
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: sean@rogue-research.com

On OS X, it is common to use:

#pragma mark - foo

to divide source code into sections.

This is supported by clang and Apple's old gcc fork.

gcc however warns:

  warning: ignoring #pragma mark  [-Wunknown-pragmas]

And -Wunknown-pragmas is part of -Wall.  I'm aware I could use
-Wno-unknown-pragmas, but building clean at -Wall is important.

As clang does a lot to be compatible with gcc, I'm hoping gcc can do a little
to be compatible with clang here. :)

No codegen or anything would be required, just ignore and don't warn when
#pragma mark is encountered.

Cheers.