https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71548
Bug ID: 71548 Summary: Invalid declaration involving template template param causes crash Product: gcc Version: 6.1.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: dude4891 at xemaps dot com Target Milestone: --- Created attachment 38706 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38706&action=edit input that crashes compiler Here is a 9-line file (no includes) which causes various versions of g++ to crash. I tested versions 4.7.3, 5.2.0, and 6.1.0; the bug was present in all. Command line: 'g++ -std=c++11 bugmin.cpp'. The output with -v for a run with version 6.1 is: Using built-in specs. COLLECT_GCC=g++ COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/x86_64-pc-linux-gnu/6.1.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: ./configure --prefix=/usr/local --disable-multilib --without-mpc --without-mpfr --without-gmp --without-cloog --without-isl --enable-languages=c,c++ Thread model: posix gcc version 6.1.0 (GCC) COLLECT_GCC_OPTIONS='-v' '-std=c++11' '-shared-libgcc' '-mtune=generic' '-march=x86-64' /usr/local/libexec/gcc/x86_64-pc-linux-gnu/6.1.0/cc1plus -quiet -v -imultiarch x86_64-linux-gnu -D_GNU_SOURCE main.cpp -quiet -dumpbase main.cpp -mtune=generic -march=x86-64 -auxbase main -std=c++11 -version -o /tmp/ccLwXocj.s GNU C++11 (GCC) version 6.1.0 (x86_64-pc-linux-gnu) compiled by GNU C version 6.1.0, GMP version 5.0.2, MPFR version 3.1.0-p3, MPC version 0.9, isl version none GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096 ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu" ignoring nonexistent directory "/usr/local/lib/gcc/x86_64-pc-linux-gnu/6.1.0/../../../../x86_64-pc-linux-gnu/include" #include "..." search starts here: #include <...> search starts here: /usr/local/lib/gcc/x86_64-pc-linux-gnu/6.1.0/../../../../include/c++/6.1.0 /usr/local/lib/gcc/x86_64-pc-linux-gnu/6.1.0/../../../../include/c++/6.1.0/x86_64-pc-linux-gnu /usr/local/lib/gcc/x86_64-pc-linux-gnu/6.1.0/../../../../include/c++/6.1.0/backward /usr/local/lib/gcc/x86_64-pc-linux-gnu/6.1.0/include /usr/local/include /usr/local/lib/gcc/x86_64-pc-linux-gnu/6.1.0/include-fixed /usr/include/x86_64-linux-gnu /usr/include End of search list. GNU C++11 (GCC) version 6.1.0 (x86_64-pc-linux-gnu) compiled by GNU C version 6.1.0, GMP version 5.0.2, MPFR version 3.1.0-p3, MPC version 0.9, isl version none GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096 Compiler executable checksum: e6557bfcf1105af72e8a2699b63dcd66 main.cpp: In substitution of 'template<class ... T> void f(S<T ...>) [with T = <missing>]': main.cpp:11:8: required from here main.cpp:11:8: internal compiler error: Segmentation fault f(s); ^ libbacktrace could not find executable to open Please submit a full bug report, with preprocessed source if appropriate. See <http://gcc.gnu.org/bugs.html> for instructions.