https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64398
Bug ID: 64398
Summary: decltype in different contexts with similar
expressions triggers segfault in GCC
Product: gcc
Version: 4.9.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: florian.we...@sfz-bw.de
The following code triggers an internal segmentation-fault in GCC:
============================================================
template<typename T> struct template1;
template<typename T, typename> // second param required
struct struct1{
using type1 = decltype(T::x);
using type2 = template1<type1>;
};
template<typename T> using alias1 = template1<decltype(T::x)>;
// just for instantiation:
template<typename T> using alias2 = alias1<T>;
============================================================
$ uname -a
Linux terra 3.14.27-1-lts #1 SMP Wed Dec 17 19:29:45 CET 2014 x86_64 GNU/Linux
$ g++ -v -save-temps -std=c++11 -c demo.cpp
Using built-in specs.
COLLECT_GCC=g++
Target: x86_64-unknown-linux-gnu
Configured with: /build/gcc/src/gcc-4.9.2/configure --prefix=/usr
--libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man
--infodir=/usr/share/info --with-bugurl=https://bugs.archlinux.org/
--enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ --enable-shared
--enable-threads=posix --with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-clocale=gnu --disable-libstdcxx-pch
--disable-libssp --enable-gnu-unique-object --enable-linker-build-id
--enable-cloog-backend=isl --disable-isl-version-check
--disable-cloog-version-check --enable-lto --enable-plugin
--enable-install-libiberty --with-linker-hash-style=gnu --disable-multilib
--disable-werror --enable-checking=release
Thread model: posix
gcc version 4.9.2 (GCC)
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-std=c++11' '-c' '-shared-libgcc'
'-mtune=generic' '-march=x86-64'
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.9.2/cc1plus -E -quiet -v -D_GNU_SOURCE
demo.cpp -mtune=generic -march=x86-64 -std=c++11 -fpch-preprocess -o demo.ii
ignoring nonexistent directory
"/usr/lib/gcc/x86_64-unknown-linux-gnu/4.9.2/../../../../x86_64-unknown-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.9.2/../../../../include/c++/4.9.2
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.9.2/../../../../include/c++/4.9.2/x86_64-unknown-linux-gnu
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.9.2/../../../../include/c++/4.9.2/backward
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.9.2/include
/usr/local/include
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.9.2/include-fixed
/usr/include
End of search list.
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-std=c++11' '-c' '-shared-libgcc'
'-mtune=generic' '-march=x86-64'
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.9.2/cc1plus -fpreprocessed demo.ii
-quiet -dumpbase demo.cpp -mtune=generic -march=x86-64 -auxbase demo -std=c++11
-version -o demo.s
GNU C++ (GCC) version 4.9.2 (x86_64-unknown-linux-gnu)
compiled by GNU C version 4.9.2, GMP version 6.0.0, MPFR version 3.1.2-p10,
MPC version 1.0.2
warning: MPFR header version 3.1.2-p10 differs from library version 3.1.2-p11.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU C++ (GCC) version 4.9.2 (x86_64-unknown-linux-gnu)
compiled by GNU C version 4.9.2, GMP version 6.0.0, MPFR version 3.1.2-p10,
MPC version 1.0.2
warning: MPFR header version 3.1.2-p10 differs from library version 3.1.2-p11.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: f6f21876c758a79b914bd8c6a01f7890
demo.cpp: In substitution of 'template<class T> using alias1 =
template1<struct1<T, <template-parameter-1-2> >::type1> [with T = T]':
demo.cpp:12:45: required from here
demo.cpp:9:62: internal compiler error: Segmentation fault
template<typename T> using alias1 = template1<decltype(T::x)>;
^
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://bugs.archlinux.org/> for instructions.
============================================================
