https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79689
Bug ID: 79689 Summary: ICE with trailing return type Product: gcc Version: 6.3.1 Status: UNCONFIRMED Keywords: ice-on-valid-code Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: mwarusz at gmail dot com Target Milestone: --- The following valid c++11 code: template <typename T> auto f(T x) -> decltype(-1. * x) { return -1. * x; } int main() { auto y = f(44.); } triggers ICE using gcc 6.3.1. The minus sign under decltype seems to be instrumental as without it it compiles fine. Compiler details: Using built-in specs. COLLECT_GCC=g++ COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/6.3.1/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: /build/gcc-multilib/src/gcc/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 --enable-libmpx --with-system-zlib --with-isl --enable-__cxa_atexit --disable-libunwind-exceptions --enable-clocale=gnu --disable-libstdcxx-pch --disable-libssp --enable-gnu-unique-object --enable-linker-build-id --enable-lto --enable-plugin --enable-install-libiberty --with-linker-hash-style=gnu --enable-gnu-indirect-function --enable-multilib --disable-werror --enable-checking=release Thread model: posix gcc version 6.3.1 20170109 (GCC)