[Bug c++/66901] New: Segmentation fault in compiler instead of error message for ill-formed program with namespace alias and qualified definition

[Bug c++/66901] New: Segmentation fault in compiler instead of error message for ill-formed program with namespace alias and qualified definition

[anders.granlund.0 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66901

            Bug ID: 66901
           Summary: Segmentation fault in compiler instead of error
                    message for ill-formed program with namespace alias
                    and qualified definition
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: anders.granlund.0 at gmail dot com
  Target Milestone: ---

Created attachment 35999
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35999&action=edit
The program prog.cc used in the command line

Compile the attached program prog.cc with the following command line:

gcc prog.cc

This results in a segmentation fault instead of an error message:

gcc: internal compiler error: Segmentation fault (program cc1plus)
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-4.8/README.Bugs> for instructions.

Since the program is ill-formed and diagnostics is required, the expected
behaviour is to get an error message instead of a segmentation fault.

Output for gcc -v:

Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.8/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.8.2-19ubuntu1'
--with-bugurl=file:///usr/share/doc/gcc-4.8/README.Bugs
--enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.8 --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.8 --libdir=/usr/lib --enable-nls
--with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-libmudflap
--enable-plugin --with-system-zlib --disable-browser-plugin
--enable-java-awt=gtk --enable-gtk-cairo
--with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64/jre --enable-java-home
--with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64
--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.8-amd64
--with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar
--enable-objc-gc --enable-multiarch --disable-werror --with-arch-32=i686
--with-abi=m64 --with-multilib-list=m32,m64,mx32 --with-tune=generic
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1)

[Bug c++/66901] Segmentation fault in compiler instead of error message for ill-formed program with namespace alias and qualified definition

[anders.granlund.0 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66901

Anders Granlund <anders.granlund.0 at gmail dot com> changed:

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

--- Comment #2 from Anders Granlund <anders.granlund.0 at gmail dot com> ---
This is consequence of 66901. I'm moving it there.

*** This bug has been marked as a duplicate of bug 66879 ***

[Bug c++/66901] Segmentation fault in compiler instead of error message for ill-formed program with namespace alias and qualified definition

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66901

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |8.1.0, 9.1.0
     Ever confirmed|0                           |1
      Known to fail|                            |7.5.0
           Keywords|                            |needs-bisection
   Last reconfirmed|                            |2021-12-03
             Status|RESOLVED                    |NEW
         Resolution|DUPLICATE                   |---

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Reopening since this looks unrelated.
It looks like it was fixed in GCC 8+ though:
<source>:5:19: error: declaration of 'struct X::S' in namespace 'X::Y' which
does not enclose 'X::Y::Z'
         struct Z::S {};
                   ^

[Bug c++/66901] Segmentation fault in compiler instead of error message for ill-formed program with namespace alias and qualified definition

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66901

Martin Liška <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |marxin at gcc dot gnu.org
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
Fixed with r8-710-g322763f5df412230.