https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106863
Bug ID: 106863 Summary: internal compiler error: in write_template_arg_literal, at cp/mangle.cc:3678 Product: gcc Version: 12.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: jehova at existiert dot net Target Milestone: --- $ g++ --version g++ (GCC) 12.2.0 Copyright (C) 2022 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. $ g++ -c bug.cxx -freport-bug bug.cxx: In instantiation of ‘decltype ((g(t), (void)0)) f(T) [with T = int]’: bug.cxx:4:6: internal compiler error: in write_template_arg_literal, at cp/mangle.cc:3678 4 | auto f(T t) -> decltype(g(t), void{}) | ^ 0x19eab38 internal_error(char const*, ...) ???:0 0x6546f4 fancy_abort(char const*, int, char const*) ???:0 0x728a60 mangle_decl(tree_node*) ???:0 0x984016 symbol_table::finalize_compilation_unit() ???:0 Please submit a full bug report, with preprocessed source. Please include the complete backtrace with any bug report. See <https://bugs.archlinux.org/> for instructions. Preprocessed source stored into /tmp/ccL1sCjr.out file, please attach this to your bugreport. $ cat bug.cxx void g(int); template <typename T> auto f(T t) -> decltype(g(t), void{}) { return g(t); } int main() { f(0); } $ cat ccL1sCjr.out // Target: x86_64-pc-linux-gnu // Configured with: /build/gcc/src/gcc/configure --enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++,d --enable-bootstrap --prefix=/usr --libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=https://bugs.archlinux.org/ --with-build-config=bootstrap-lto --with-linker-hash-style=gnu --with-system-zlib --enable-__cxa_atexit --enable-cet=auto --enable-checking=release --enable-clocale=gnu --enable-default-pie --enable-default-ssp --enable-gnu-indirect-function --enable-gnu-unique-object --enable-libstdcxx-backtrace --enable-link-serialization=1 --enable-linker-build-id --enable-lto --enable-multilib --enable-plugin --enable-shared --enable-threads=posix --disable-libssp --disable-libstdcxx-pch --disable-werror // Thread model: posix // Supported LTO compression algorithms: zlib zstd // gcc version 12.2.0 (GCC) // // bug.cxx: In instantiation of ‘decltype ((g(t), (void)0)) f(T) [with T = int]’: // bug.cxx:4:6: internal compiler error: in write_template_arg_literal, at cp/mangle.cc:3678 // 4 | auto f(T t) -> decltype(g(t), void{}) // | ^ // 0x19eab38 internal_error(char const*, ...) // ???:0 // 0x6546f4 fancy_abort(char const*, int, char const*) // ???:0 // 0x728a60 mangle_decl(tree_node*) // ???:0 // 0x984016 symbol_table::finalize_compilation_unit() // ???:0 // Please submit a full bug report, with preprocessed source. // Please include the complete backtrace with any bug report. // See <https://bugs.archlinux.org/> for instructions. // /usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/cc1plus -quiet -D_GNU_SOURCE bug.cxx -quiet -dumpbase bug.cxx -dumpbase-ext .cxx -mtune=generic -march=x86-64 -freport-bug -o - -frandom-seed=0 -fdump-noaddr # 0 "bug.cxx" # 0 "<built-in>" # 0 "<command-line>" # 1 "/usr/include/stdc-predef.h" 1 3 4 # 0 "<command-line>" 2 # 1 "bug.cxx" void g(int); template <typename T> auto f(T t) -> decltype(g(t), void{}) { return g(t); } int main() { f(0); }