https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80908
Bug ID: 80908 Summary: [c++1z] ICE on instantiating a template deducing the noexcept-ness of a function pointer Product: gcc Version: 7.1.1 Status: UNCONFIRMED Keywords: ice-on-invalid-code Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: hafnermorris at gmail dot com Target Milestone: --- Created attachment 41433 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41433&action=edit Minimal example code The following incorrect code causes an internal compiler error in C++17 mode starting with gcc 7.1.0: template<typename T> struct S; template<bool IsNoexcept> struct S<void(*)() noexcept(IsNoexcept)> { S() {} }; void f() {} int main() { S<decltype(&f)> {}; } The code is probably incorrect, because it tries to deduce noexcept(bool) and is rejected by clang in C++17 mode. Compiler invocation: g++ -std=c++1z example.cpp example.cpp: In instantiation of ‘S<void (*)() noexcept (IsNoexcept)>::S() [with bool IsNoexcept = false]’: example.cpp:12:19: required from here example.cpp:6:2: internal compiler error: Segmentation fault S() {} ^ Please submit a full bug report, with preprocessed source if appropriate. See <https://bugs.archlinux.org/> for instructions. gcc -v: Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/7.1.1/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: /build/gcc/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 --disable-multilib --disable-werror --enable-checking=release Thread model: posix gcc version 7.1.1 20170516 (GCC) On Wandbox: https://wandbox.org/permlink/xksH3sEPyOThuoiR