http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55564
Bug #: 55564
Summary: internal error using decltype of a template type
parameter for late-specified function result type
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: pub...@alisdairm.net
The following program gives an internal compiler error, when built with the
command line: g++ -std=c++11 main.cpp
//---------------------------------------------------
template <typename T, decltype(sizeof(T)) N>
auto array_size(T(&)[N]) -> decltype(N) { return N; }
int main() {
int simple[4] = {};
int result = array_size(simple);
return result;
}
//---------------------------------------------------
The error I get from my build of gcc is:
main.cpp: In function 'int main()':
main.cpp:1:38: internal compiler error: in dependent_type_p, at cp/pt.c:19249
template <typename T, decltype(sizeof(T)) N>
^
main.cpp:1:38: internal compiler error: Abort trap: 6
g++-mp-4.8: internal compiler error: Abort trap: 6 (program cc1plus)
Abort trap: 6
Build is a recent version obtained from MacPorts, running on the latest Apple
Mountain Lion OS with up to date patches.
g++ -v:
Using built-in specs.
COLLECT_GCC=g++-mp-4.8
COLLECT_LTO_WRAPPER=/opt/local/libexec/gcc/x86_64-apple-darwin12/4.8.0/lto-wrapper
Target: x86_64-apple-darwin12
Configured with: ../gcc-4.8-20121125/configure --prefix=/opt/local
--build=x86_64-apple-darwin12
--enable-languages=c,c++,objc,obj-c++,fortran,java
--libdir=/opt/local/lib/gcc48 --includedir=/opt/local/include/gcc48
--infodir=/opt/local/share/info --mandir=/opt/local/share/man
--datarootdir=/opt/local/share/gcc-4.8 --with-local-prefix=/opt/local
--with-system-zlib --disable-nls --program-suffix=-mp-4.8
--with-gxx-include-dir=/opt/local/include/gcc48/c++/ --with-gmp=/opt/local
--with-mpfr=/opt/local --with-mpc=/opt/local --with-ppl=/opt/local
--with-cloog=/opt/local --enable-cloog-backend=isl
--disable-cloog-version-check --enable-stage1-checking --disable-multilib
--enable-lto --enable-libstdcxx-time --with-as=/opt/local/bin/as
--with-ld=/opt/local/bin/ld --with-ar=/opt/local/bin/ar
--with-bugurl=https://trac.macports.org/newticket --with-pkgversion='MacPorts
gcc48 4.8-20121125_0'
Thread model: posix
gcc version 4.8.0 20121125 (experimental) (MacPorts gcc48 4.8-20121125_0)
