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Subject: [Bug c++/56095] Crash casting function pointer as non-type template argument
Date: Thu, 24 Jan 2013 06:39:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D56095

--- Comment #1 from Rendaw <spoo at zarbosoft dot com> 2013-01-24 06:39:12 =
UTC ---
I tried one more case, casting before using the template:

Code (c.cxx):
int *a(void) { return 0; }
typedef void (*IntermediarySignature)(void);
template <IntermediarySignature b> void z(void) {}

int main(int argc, char **argv)
{
    constexpr IntermediarySignature c =3D (IntermediarySignature)a;
    z<c>();
    return 0;
}

4.7 output:
> g++-4.7 -std=3Dc++11 c.cxx=20
c.cxx: In function =E2=80=98int main(int, char**)=E2=80=99:
c.cxx:8:7: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-4.7/README.Bugs> for instructions.
Preprocessed source stored into /tmp/ccw2QOq9.out file, please attach this =
to
your bugreport.

4.6 output:
> g++ -std=3Dc++0x c.cxx=20
c.cxx: In function =E2=80=98int main(int, char**)=E2=80=99:
c.cxx:8:7: error: =E2=80=98(IntermediarySignature)a=E2=80=99 is not a valid=
 template argument
for type =E2=80=98void (*)()=E2=80=99 because function =E2=80=98#=E2=80=98n=
op_expr=E2=80=99 not supported by
dump_decl#<declaration error>=E2=80=99 has not external linkage
c.cxx:8:7: error: no matching function for call to =E2=80=98z()=E2=80=99
c.cxx:8:7: note: candidate is:
c.cxx:3:41: note: template<void (* b)()> void z()