[Bug c++/52837] New: ICE in cp/mangle.c:3306

[Bug c++/52837] New: ICE in cp/mangle.c:3306

[matt at godbolt dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52837

             Bug #: 52837
           Summary: ICE in cp/mangle.c:3306
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: matt@godbolt.org


GCC version: 4.7.0 (custom build)
System type: Ubuntu 11.10 3.0.0-16-generic
$ /site/apps/gcc-4.7.0-drw.2/bin/gcc -v
Using built-in specs.
COLLECT_GCC=/site/apps/gcc-4.7.0-drw.2/bin/gcc
COLLECT_LTO_WRAPPER=/site/apps/gcc-4.7.0-drw.2/libexec/gcc/x86_64-linux-gnu/4.7.0/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ./configure --prefix /site/apps/gcc-4.7.0-drw.2
--build=x86_64-linux-gnu --enable-clocale=gnu --enable-gold
--enable-languages=c,c++ --enable-ld=default --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-linker-build-id --enable-lto
--enable-plugin --enable-shared --enable-threads=posix --host=x86_64-linux-gnu
--target=x86_64-linux-gnu --with-pkgversion=DRW-internal-build
--with-plugin-ld=ld.gold --with-system-zlib
--with-gmp=/home/prodappadmin/fig-packages/scratch/gcc/4.7.0/build/gmp-5.0.2
--with-mpfr=/home/prodappadmin/fig-packages/scratch/gcc/4.7.0/build/mpfr-3.1.0
--with-mpc=/home/prodappadmin/fig-packages/scratch/gcc/4.7.0/build/mpc-0.9
--with-libelf=/home/prodappadmin/fig-packages/scratch/gcc/4.7.0/build/libelf-0.8.9
Thread model: posix
gcc version 4.7.0 (DRW-internal-build) 

command-line: /site/apps/gcc-4.7.0-drw.2/bin/gcc -MD -g3 -Wall -fPIC -DXP_UNIX
-DIN_GCC -DPLUGIN_NO_POISON -DHAVE_CONFIG_H 
-I/site/apps/gcc-4.7.0-drw.2/lib/gcc/x86_64-linux-gnu/4.7.0/plugin/include
-I/home/mgodbolt/build/objs-js/dist/include
-I/home/mgodbolt/build/objs-js/dist/lib -I//home/mgodbolt/local/include/js/ 
-O2 -x c++ -c util.c

compiler output: 
In file included from /home/mgodbolt/build/objs-js/dist/include/jsval.h:48:0,
                 from /home/mgodbolt/build/objs-js/dist/include/jspubtd.h:47,
                 from /home/mgodbolt/build/objs-js/dist/include/jsapi.h:49,
                 from gcc_compat.h:31,
                 from util.c:21:
/home/mgodbolt/build/objs-js/dist/include/jsutil.h:642:58: internal compiler
error: in mangle_decl_string, at cp/mangle.c:3306

....

When compiling the attached file we get an ICE in cp/mangle.c line 3306
(commented "We shouldn't be trying to mangle an uninstantiated template.").

I have been unable to winnow down a more confined example of this error as I am
very unfamiliar with the code being built (it's an old version of the mozilla
JS runtime).

The error can be reproduced with the attached preprocessed file using simply 
"cc1plus util.ii"

[Bug c++/52837] ICE in cp/mangle.c:3306

[matt at godbolt dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52837

--- Comment #1 from Matt Godbolt <matt at godbolt dot org> 2012-04-02 22:17:15 UTC ---
Created attachment 27071
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27071
This is the .ii file that reproduces the problem. (gzipped to get past upload
limitations)

(attempt at attaching .ii file, first attempt failed).

[Bug c++/52837] ICE in cp/mangle.c:3306

[matt at godbolt dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52837

--- Comment #2 from Matt Godbolt <matt at godbolt dot org> 2012-04-02 22:51:14 UTC ---
After a little more research, I've managed to get a 4-line reproduction case.
(See attached).

I also confirmed this code compiles without error on GCC4.5 and GCC4.6.

[Bug c++/52837] ICE in cp/mangle.c:3306

[matt at godbolt dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52837

--- Comment #3 from Matt Godbolt <matt at godbolt dot org> 2012-04-02 22:52:26 UTC ---
Created attachment 27072
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27072
Minimal reproducible test case

$ /site/apps/gcc-4.7.0-drw.2/bin/gcc -c gcc-4.7-ice-demangle.cc 
gcc-4.7-ice-demangle.cc:6:58: internal compiler error: in mangle_decl_string,
at cp/mangle.c:3306

[Bug c++/52837] ICE in cp/mangle.c:3306

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52837

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-04-03 06:49:07 UTC ---
Dup of PR52759 ?

[Bug c++/52837] ICE in cp/mangle.c:3306

[matt at godbolt dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52837

Matt Godbolt <matt at godbolt dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |DUPLICATE

--- Comment #5 from Matt Godbolt <matt at godbolt dot org> 2012-04-03 12:33:53 UTC ---
Definite duplicate of 52759. Thanks Jakub.

*** This bug has been marked as a duplicate of bug 52759 ***