[Bug bootstrap/54609] New: libbacktrace breaks bootstrap using clang

["howarth at nitro dot med.uc.edu" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54609

             Bug #: 54609
           Summary: libbacktrace breaks bootstrap using clang
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: howarth@nitro.med.uc.edu


The bootstrap of gcc trunk at r191397 is broken when clang is used as the
system compiler on x86_64-apple-darwin12...

libtool: compile:  gcc -DHAVE_CONFIG_H -I.
-I../../gcc-4.8-20120917/libbacktrace -W -Wall -Wwrite-strings
-Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition
-Wmissing-format-attribute -Wcast-qual -Werror -I
../../gcc-4.8-20120917/libbacktrace/../include -I ../libgcc -g -MT unknown.lo
-MD -MP -MF .deps/unknown.Tpo -c ../../gcc-4.8-20120917/libbacktrace/unknown.c
-o unknown.o
../../gcc-4.8-20120917/libbacktrace/unknown.c:45:46: error: parameter name
omitted
                  backtrace_error_callback ATTRIBUTE_UNUSED,
                                                           ^
../../gcc-4.8-20120917/libbacktrace/unknown.c:56:1: error: conflicting types
for 'backtrace_initialize'
backtrace_initialize (int descriptor ATTRIBUTE_UNUSED,
^
../../gcc-4.8-20120917/libbacktrace/internal.h:212:12: note: previous
declaration is here
extern int backtrace_initialize (struct backtrace_state *state,
           ^
../../gcc-4.8-20120917/libbacktrace/unknown.c:61:16: error: incompatible
pointer types assigning to 'fileline' (aka 'int (*)(struct backtrace_state *,
uintptr_t, backtrace_full_callback,
      backtrace_error_callback, void *)') from 'int (void *, uintptr_t,
backtrace_full_callback, backtrace_error_callback, void *)'
[-Werror,-Wincompatible-pointer-types]
  *fileline_fn = unknown_fileline;
               ^ ~~~~~~~~~~~~~~~~
3 errors generated.
yes
make[4]: *** [unknown.lo] Error 1
make[4]: *** Waiting for unfinished jobs....