[Bug c/47997] New: gcc on macosx: "ld: warning: -fwritable-strings not compatible with literal CF/NSString"

["anatol.pomozov at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47997

           Summary: gcc on macosx: "ld: warning: -fwritable-strings not
                    compatible with literal CF/NSString"
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: anatol.pomozov@gmail.com


Created attachment 23553
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23553
A repro case for "ld: warning: -fwritable-strings not compatible with literal
CF/NSString" warning

Hi,

I am trying to implement a program that uses fsevent library on macosx.
http://developer.apple.com/library/mac/#documentation/Darwin/Conceptual/FSEvents_ProgGuide/UsingtheFSEventsFramework/UsingtheFSEventsFramework.html#//apple_ref/doc/uid/TP40005289-CH4-SW4

And I need some features (such as __thread) that is not supported neither by
outdated GCC from XCode, nor by Clang. The only option is GCC from MacPorts.

I installed GCC-4.6 from macports (gcc46 @4.6-20110226) and trying to compile a
fsevent sample (see it in the attachement).

When I try to compile it with gcc 4.6 it produces a weird warning:

$ gcc-mp-4.6 -framework CoreServices ld_warn.c
ld: warning: -fwritable-strings not compatible with literal CF/NSString in
/var/folders/++/++27Xk++6+0++4RjPqRgNE+-0Mw/-Tmp-//cc3B1vHB.o


The output binary looks OK.

When I try to compile the same sources either with gcc from XCode or clang - it
compiles without any warning:

$ clang -framework CoreServices ld_warn.c


It makes me think that this is an issue with GCC.


I also googled following clang bug that looks very similar
http://llvm.org/bugs/show_bug.cgi?id=8993