https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115919
Bug ID: 115919 Summary: ICE: in tsubst_expr, at cp/pt.cc:20300 Product: gcc Version: 15.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: iamanonymous.cs at gmail dot com Target Milestone: --- Target: x86_64 ******************************************************************************* The compiler produces an internal error during tsubst_expr when compiling the provided code with the specified options. The issue can also be reproduced on Compiler Explorer. ******************************************************************************* OS and Platform: # uname -a Linux ubuntu 4.15.0-213-generic #224-Ubuntu SMP Mon Jun 19 13:30:12 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux ******************************************************************************* # g++ -v Using built-in specs. COLLECT_GCC=g++ COLLECT_LTO_WRAPPER=/root/gdbtest/gcc/gcc-15/libexec/gcc/x86_64-pc-linux-gnu/15.0.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: /root/gdbtest/gcc/obj/../gcc/configure --prefix=/root/gdbtest/gcc/gcc-15 --enable-languages=c,c++,fortran,go --disable-multilib Thread model: posix Supported LTO compression algorithms: zlib gcc version 15.0.0 20240509 (experimental) (GCC) ******************************************************************************* Program: # cat pom.ii template<int i> class A { public: static double const VAL = 0.5; enum { COS = (int)(A::VAL) }; }; int main() { A<5>::COS; return 0; } ******************************************************************************* Command Lines: # g++ pom.ii -O2 -Wall -Wextra -pedantic -std=c++17 -fno-exceptions -fno-rtti -fstrict-aliasing -Wshadow -Wnon-virtual-dtor -Wold-style-cast -Wcast-align -Woverloaded-virtual -Wconversion -Wsign-conversion -Wduplicated-cond -Wduplicated-branches -Wlogical-op -Wnull-dereference -Wuseless-cast -Wdouble-promotion -Wformat=2 -o pom.o pom.cpp:5:25: error: ‘constexpr’ needed for in-class initialization of static data member ‘const double A<i>::VAL’ of non-integral type [-fpermissive] pom.cpp:9:20: warning: use of old-style cast to ‘int’ [-Wold-style-cast] pom.cpp: In instantiation of ‘class A<5>’: pom.cpp:15:9: required from here pom.cpp:5:25: error: ‘constexpr’ needed for in-class initialization of static data member ‘const double A<5>::VAL’ of non-integral type [-fpermissive] pom.cpp:9:8: internal compiler error: in tsubst_expr, at cp/pt.cc:20306 0x82df47 tsubst_expr(tree_node*, tree_node*, int, tree_node*) /root/gdbtest/gcc/obj/../gcc/gcc/cp/pt.cc:20306 0xcdf0fe tsubst_enum /root/gdbtest/gcc/obj/../gcc/gcc/cp/pt.cc:27699 0xcdf0fe lookup_template_class(tree_node*, tree_node*, tree_node*, tree_node*, int) /root/gdbtest/gcc/obj/../gcc/gcc/cp/pt.cc:10496 0xcd2cd0 tsubst(tree_node*, tree_node*, int, tree_node*) /root/gdbtest/gcc/obj/../gcc/gcc/cp/pt.cc:16265 0xccf2d4 tsubst_decl /root/gdbtest/gcc/obj/../gcc/gcc/cp/pt.cc:15435 0xcef0d0 instantiate_class_template(tree_node*) /root/gdbtest/gcc/obj/../gcc/gcc/cp/pt.cc:12572 0xd43e90 complete_type(tree_node*) /root/gdbtest/gcc/obj/../gcc/gcc/cp/typeck.cc:138 0xc6bc3a cp_parser_nested_name_specifier_opt /root/gdbtest/gcc/obj/../gcc/gcc/cp/parser.cc:7271 0xc7a7b7 cp_parser_simple_type_specifier /root/gdbtest/gcc/obj/../gcc/gcc/cp/parser.cc:20576 0xc53411 cp_parser_type_specifier /root/gdbtest/gcc/obj/../gcc/gcc/cp/parser.cc:20227 0xc551ed cp_parser_decl_specifier_seq /root/gdbtest/gcc/obj/../gcc/gcc/cp/parser.cc:16675 0xc56588 cp_parser_simple_declaration /root/gdbtest/gcc/obj/../gcc/gcc/cp/parser.cc:15831 0xc7cb60 cp_parser_declaration_statement /root/gdbtest/gcc/obj/../gcc/gcc/cp/parser.cc:14944 0xc84b7e cp_parser_statement /root/gdbtest/gcc/obj/../gcc/gcc/cp/parser.cc:12897 0xc59807 cp_parser_statement_seq_opt /root/gdbtest/gcc/obj/../gcc/gcc/cp/parser.cc:13427 0xc59a2f cp_parser_compound_statement /root/gdbtest/gcc/obj/../gcc/gcc/cp/parser.cc:13281 0xc7ccd5 cp_parser_function_body /root/gdbtest/gcc/obj/../gcc/gcc/cp/parser.cc:26072 0xc7ccd5 cp_parser_ctor_initializer_opt_and_function_body /root/gdbtest/gcc/obj/../gcc/gcc/cp/parser.cc:26123 0xc8241e cp_parser_function_definition_after_declarator /root/gdbtest/gcc/obj/../gcc/gcc/cp/parser.cc:32903 0xc835be cp_parser_function_definition_from_specifiers_and_declarator /root/gdbtest/gcc/obj/../gcc/gcc/cp/parser.cc:32820 Please submit a full bug report, with preprocessed source (by using -freport-bug). Please include the complete backtrace with any bug report. See <https://gcc.gnu.org/bugs/> for instructions. ******************************************************************************* Also ICE on trunk, compiler explorer:https://godbolt.org/z/KvhjM1Ese *******************************************************************************