[Bug libgcc/63682] New: m32c: libgcc configure checks for SJLJ model even when C++ and Java are disabled

[Bug libgcc/63682] New: m32c: libgcc configure checks for SJLJ model even when C++ and Java are disabled

[joel at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63682

            Bug ID: 63682
           Summary: m32c: libgcc configure checks for SJLJ model even when
                    C++ and Java are disabled
           Product: gcc
           Version: 4.9.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libgcc
          Assignee: unassigned at gcc dot gnu.org
          Reporter: joel at gcc dot gnu.org

On the m32c, C++ and Java are not supported. Thus we build with C only and the
target doesn't have any need for SJLJ information. Unfortunately libgcc always
probes for this.

checking whether decimal floating point is supported... no
configure: WARNING: decimal float is not supported for this target, ignored
checking whether fixed-point is supported... no
checking whether to use setjmp/longjmp exceptions... unknown
configure: error: unable to detect exception model

And if you pass in --disable-sjlj-exceptions, the build fails in libgcc with an
ICE.

[Bug libgcc/63682] m32c: libgcc configure checks for SJLJ model even when C++ and Java are disabled

[dj at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63682

--- Comment #1 from DJ Delorie <dj at redhat dot com> ---
m32c-elf supports C++.  What is the contents of the failing config.log?

Also, there's nothing m32c-specific in the sjlj checks, it's the same for all
sjlj targets.

[Bug libgcc/63682] m32c: libgcc configure checks for SJLJ model even when C++ and Java are disabled

[joel at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63682

--- Comment #3 from Joel Sherrill <joel at gcc dot gnu.org> ---
(In reply to DJ Delorie from comment #1)
> m32c-elf supports C++.  What is the contents of the failing config.log?

Hmm... then this should work. We intentionally don't deviate much from *-elf
targets. I was only building C in this run.

> Also, there's nothing m32c-specific in the sjlj checks, it's the same for
> all sjlj targets.

I know. But m32c and (I think) h8300 were the only failures.

[Bug libgcc/63682] m32c: libgcc configure checks for SJLJ model even when C++ and Java are disabled

[joel at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63682

--- Comment #2 from Joel Sherrill <joel at gcc dot gnu.org> ---
Created attachment 33847
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33847&action=edit
config.log