https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111785
Bug ID: 111785 Summary: [modules] ICE when compiling fmt lib as module Product: gcc Version: 14.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: mends-sputter.0z at icloud dot com Target Milestone: --- Created attachment 56095 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=56095&action=edit preprocessed output generated by -freport-bug GCC 14.0 from recent snapshot (20231008) on aarch64 Using built-in specs. COLLECT_GCC=g++ COLLECT_LTO_WRAPPER=/opt/gcc14/libexec/gcc/aarch64-unknown-linux-gnu/14.0.0/lto-wrapper Target: aarch64-unknown-linux-gnu Configured with: ../configure --prefix=/opt/gcc14 --enable-languages=c,c++ --disable-multilib Thread model: posix Supported LTO compression algorithms: zlib gcc version 14.0.0 20231008 (experimental) (GCC) When attempting to build fmt from https://github.com/fmtlib/fmt, with the following command: g++ -std=c++20 -fmodules-ts -I../include fmt.cc The compiler ICEs with the following error: fmt.cc:73:8: internal compiler error: in core_vals, at cp/module.cc:6262 73 | export module fmt; | ^ 0x9a9b67 trees_out::core_vals(tree_node*) ../../gcc/cp/module.cc:6262 0x9add5f trees_out::tree_node_vals(tree_node*) ../../gcc/cp/module.cc:7218 0x9add5f trees_out::tree_value(tree_node*) ../../gcc/cp/module.cc:9083 0x9a7c73 trees_out::tree_node(tree_node*) ../../gcc/cp/module.cc:9281 0x9a9537 trees_out::core_vals(tree_node*) ../../gcc/cp/module.cc:6171 0x9a5fb3 trees_out::tree_node_vals(tree_node*) ../../gcc/cp/module.cc:7218 0x9a5fb3 trees_out::decl_value(tree_node*, depset*) ../../gcc/cp/module.cc:7797 0x9b0823 depset::hash::find_dependencies(module_state*) ../../gcc/cp/module.cc:13328 0x9b16c7 module_state::write_begin(elf_out*, cpp_reader*, module_state_config&, unsigned int&) ../../gcc/cp/module.cc:17895 0x9b2a0f finish_module_processing(cpp_reader*) ../../gcc/cp/module.cc:20241 0x91df57 c_parse_final_cleanups() ../../gcc/cp/decl2.cc:5255 0xbe773f c_common_parse_file() ../../gcc/c-family/c-opts.cc:1296 attaching the file generated by -freport-bug - compressed with the gzip tool. Note that this is similar and involves the same file as reported in this other in a comment in a separate report: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108080#c7 however with gcc 14.0 snapshots, this fails with every level of optimization flags, although in each case the crash dump is slightly different and fails on a separate line.