[Bug c/77770] New: Internal compiler error on source which compiles with earlier versions.

[zoltan at bendor dot com.au]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77770

            Bug ID: 77770
           Summary: Internal compiler error on source which compiles with
                    earlier versions.
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zoltan at bendor dot com.au
  Target Milestone: ---

Created attachment 39708
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=39708&action=edit
The compiler command line

Source code which compiles with 4.7.2 (and I was told, but not tested, with
5.1.0 as well) fails with internal compiler error on 5.4.0 and 6.1.0.

It is a cross-compiler, in all cases generated with the following configure:

--target=arm-eabi --disable-libada --disable-libssp --disable-lto
--enable-languages=c

The host is GNU/Linux, cross binutils installed with --target=arm-eabi

It should be noted that it succeeds to compile the code for both ARM and THUMB
if optimising for speed and also for ARM optimising for size, but fails with
the THUMB and optimising for size case (the target architecture is ARM7TDMI).

Attached are the command line, the error message and the preprocessed source
file. This particular set of files was generated by the 5.4.0 compiler.