https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84045
Bug ID: 84045 Summary: ICE when is_nothrow_default_constructible is used before #include<set> Product: gcc Version: 7.2.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: schlaffi at users dot sourceforge.net Target Milestone: --- The following valid code #include <type_traits> template <typename T, typename S> struct dummy{ typedef std::is_nothrow_default_constructible<T> dc; void fu()noexcept(dc::value){} }; #include <set> int main(){ std::set<int> bar; return 0; } causes the ICE: In file included from /usr/include/c++/7/set:60:0, from ice.cc:9: /usr/include/c++/7/bits/stl_tree.h: In instantiation of ‘std::_Rb_tree_key_compare<_Key_compare>::_Rb_tree_key_compare() [with _Key_compare = std::less<int>]’: ice.cc:12:16: required from here /usr/include/c++/7/bits/stl_tree.h:146:7: internal compiler error: Segmentation fault _Rb_tree_key_compare() The following changes make the code compile without error: - include <set> before struct dummy - force dc::value to be bool (e.g. not not dc::value or bool(dc::value)) - expand the typedef in dc::value - have only one template parameter But, it took me quite a while to find what line causes the error. My gcc is Using built-in specs. COLLECT_GCC=g++ COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/7/lto-wrapper OFFLOAD_TARGET_NAMES=nvptx-none OFFLOAD_TARGET_DEFAULT=1 Target: x86_64-redhat-linux Configured with: ../configure --enable-bootstrap --enable-languages=c,c++,objc,obj-c++,fortran,ada,go,lto --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared --enable-threads=posix --enable-checking=release --enable-multilib --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-gcc-major-version-only --with-linker-hash-style=gnu --enable-plugin --enable-initfini-array --with-isl --enable-libmpx --enable-offload-targets=nvptx-none --without-cuda-driver --enable-gnu-indirect-function --with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux Thread model: posix gcc version 7.2.1 20170915 (Red Hat 7.2.1-2) (GCC)