[Bug c++/51826] New: internal compiler error: in convert_nontype_argument, at cp/pt.c:5408

[Bug c++/51826] New: internal compiler error: in convert_nontype_argument, at cp/pt.c:5408

[just.serejko at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51826

             Bug #: 51826
           Summary: internal compiler error: in convert_nontype_argument,
                    at cp/pt.c:5408
    Classification: Unclassified
           Product: gcc
           Version: 4.6.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: just.serejko@gmail.com


The following code

template<int n> 
struct bug {
    static const int value = 0;
};

int main(int argc, char **argv) {

    int x = bug<(int)"123">::value;
    return 0;
}

gives me this on 4.6.1 (MinGW):

template_mess.cpp: In function 'int main(int, char**)':
template_mess.cpp:8:24: internal compiler error: in convert_nontype_argument,
at cp/pt.c:5408
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

or more verbosely:

Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=c:/mingw/bin/../libexec/gcc/mingw32/4.6.1/lto-wrapper.exe
Target: mingw32
Configured with: ../gcc-4.6.1/configure
--enable-languages=c,c++,fortran,objc,obj-c++ --disable-sjlj-exceptions
--with-dwarf2 --enable-shared --enable-libgomp --disable-win32-registry
--enable-libstdcxx-debug --enable-version-specific-runtime-libs --build=mingw32
--prefix=/mingw
Thread model: win32
gcc version 4.6.1 (GCC) 
COLLECT_GCC_OPTIONS='-o' 'template_mess.exe' '-v' '-save-temps'
'-shared-libgcc' '-mtune=i386' '-march=i386'
 c:/mingw/bin/../libexec/gcc/mingw32/4.6.1/cc1plus.exe -E -quiet -v -iprefix
c:\mingw\bin\../lib/gcc/mingw32/4.6.1/ template_mess.cpp -mtune=i386
-march=i386 -fpch-preprocess -o template_mess.ii
ignoring nonexistent directory
"c:\mingw\bin\../lib/gcc/mingw32/4.6.1/../../../../mingw32/include"
ignoring duplicate directory
"c:/mingw/lib/gcc/../../lib/gcc/mingw32/4.6.1/include/c++"
ignoring duplicate directory
"c:/mingw/lib/gcc/../../lib/gcc/mingw32/4.6.1/include/c++/mingw32"
ignoring duplicate directory
"c:/mingw/lib/gcc/../../lib/gcc/mingw32/4.6.1/include/c++/backward"
ignoring duplicate directory
"c:/mingw/lib/gcc/../../lib/gcc/mingw32/4.6.1/include"
ignoring nonexistent directory "/mingw/include"
ignoring duplicate directory "c:/mingw/lib/gcc/../../include"
ignoring duplicate directory
"c:/mingw/lib/gcc/../../lib/gcc/mingw32/4.6.1/include-fixed"
ignoring nonexistent directory
"c:/mingw/lib/gcc/../../lib/gcc/mingw32/4.6.1/../../../../mingw32/include"
ignoring nonexistent directory "/mingw/include"
#include "..." search starts here:
#include <...> search starts here:
 c:\mingw\bin\../lib/gcc/mingw32/4.6.1/include/c++
 c:\mingw\bin\../lib/gcc/mingw32/4.6.1/include/c++/mingw32
 c:\mingw\bin\../lib/gcc/mingw32/4.6.1/include/c++/backward
 c:\mingw\bin\../lib/gcc/mingw32/4.6.1/include
 c:\mingw\bin\../lib/gcc/mingw32/4.6.1/../../../../include
 c:\mingw\bin\../lib/gcc/mingw32/4.6.1/include-fixed
End of search list.
COLLECT_GCC_OPTIONS='-o' 'template_mess.exe' '-v' '-save-temps'
'-shared-libgcc' '-mtune=i386' '-march=i386'
 c:/mingw/bin/../libexec/gcc/mingw32/4.6.1/cc1plus.exe -fpreprocessed
template_mess.ii -quiet -dumpbase template_mess.cpp -mtune=i386 -march=i386
-auxbase template_mess -version -o template_mess.s
GNU C++ (GCC) version 4.6.1 (mingw32)
    compiled by GNU C version 4.6.1, GMP version 5.0.1, MPFR version 2.4.1, MPC
version 0.8.1
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU C++ (GCC) version 4.6.1 (mingw32)
    compiled by GNU C version 4.6.1, GMP version 5.0.1, MPFR version 2.4.1, MPC
version 0.8.1
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 8e56a7b4b7f3db333ff95dd4b2d788a4
template_mess.cpp: In function 'int main(int, char**)':
template_mess.cpp:8:24: internal compiler error: in convert_nontype_argument,
at cp/pt.c:5408
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

[Bug c++/51826] [4.6 Regression] internal compiler error: in convert_nontype_argument, at cp/pt.c:5408

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51826

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
      Known to work|                            |4.5.3, 4.7.0
           Keywords|                            |ice-on-invalid-code
   Last reconfirmed|                            |2012-01-12
     Ever Confirmed|0                           |1
            Summary|internal compiler error: in |[4.6 Regression] internal
                   |convert_nontype_argument,   |compiler error: in
                   |at cp/pt.c:5408             |convert_nontype_argument,
                   |                            |at cp/pt.c:5408
   Target Milestone|---                         |4.6.3
      Known to fail|                            |4.6.2

--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-01-12 09:17:30 UTC ---
Confirmed.

> g++ -S t.C 
t.C: In function 'int main(int, char**)':
t.C:8:26: error: cast from 'const char*' to 'int' loses precision
[-fpermissive]
t.C:8:31: error: '(int)((long int)"123")' is not a constant expression
t.C:8:31: note: in template argument for type 'int' 

> g++ -S t.C -m32
t.C: In function 'int main(int, char**)':
t.C:8:31: internal compiler error: in convert_nontype_argument, at cp/pt.c:5408
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

On trunk:

> g++ -S t.C -m32 -B /abuild/rguenther/trunk-g/gcc
t.C: In function 'int main(int, char**)':
t.C:8:31: error: conversion from pointer type 'const char (*)[4]' to arithmetic
type 'int' in a constant-expression
t.C:8:31: note: in template argument for type 'int' 

so it's invalid source, fixed on trunk.  4.5 says

g++ -S t.C -m32
t.C: In function 'int main(int, char**)':
t.C:8:31: error: '(int)"123"' is not a valid template argument for type 'int'
because it is a non-constant expression

[Bug c++/51826] [4.6 Regression] internal compiler error: in convert_nontype_argument, at cp/pt.c:5408

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51826

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.6.3                       |4.6.4

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-03-01 14:38:33 UTC ---
GCC 4.6.3 is being released.

[Bug c++/51826] [4.6 Regression] internal compiler error: in convert_nontype_argument, at cp/pt.c:5408

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51826

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

--- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-08-25 18:37:08 UTC ---
At this point WONTFIX in 4_6-branch.