https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99543
Bug ID: 99543 Summary: ICE module compilation ../../gcc/toplev.c:327 Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: ryan.burn at gmail dot com Target Milestone: --- Here is the stacktrace. It happened when I tried to compile a header module that imported another header module: // a.h import <iostream>; SUBCOMMAND: # //example/header-module:a_hdr [action 'Action example/header-module/a.h.gcm', configuration: 86d23d2b5aedbeecfc6e6954ea9486ec39e9e40bcbc4b17cec46a06eed198d11, execution platform: @local_config_platform//:host] (cd /root/.cache/bazel/_bazel_root/f8087e59fd95af1ae29e8fcb7ff1a3dc/execroot/com_github_rnburn_bazel_cpp20_modules && \ exec env - \ bazel-out/k8-opt-exec-2B5CBBC6/bin/util/process_wrapper/process_wrapper -- /usr/local/bin/gcc -U_FORTIFY_SOURCE -fstack-protector -Wall -Wunused-but-set-parameter -Wno-free-nonheap-object -fno-omit-frame-pointer '-std=c++0x' -Ibazel-out/k8-fastbuild/bin/example/header-module/system/iostream-include -x c++-header -fmodules-ts '-std=c++20' -fno-canonical-system-headers -Wno-builtin-macro-redefined '-D__DATE__="redacted"' '-D__TIMESTAMP__="redacted"' '-D__TIME__="redacted"' -c example/header-module/a.h '-fmodule-mapper=bazel-out/k8-fastbuild/bin/example/header-module/a_hdr-module-map' -iquote .) INFO: From Action example/header-module/a.h.gcm: example/header-module/a.h: internal compiler error: Segmentation fault 0x10a9ccf crash_signal ../../gcc/toplev.c:327 0x1c671d6 get_location_from_adhoc_loc(line_maps const*, unsigned int) ../../libcpp/line-map.c:257 0x9ff6dd module_state::write_location(bytes_out&, unsigned int) ../../gcc/cp/module.cc:15569 0xa01faf module_state::write_define(bytes_out&, cpp_macro const*, bool) ../../gcc/cp/module.cc:16337 0xa0340a module_state::write_macros(elf_out*, cpp_reader*, unsigned int*) ../../gcc/cp/module.cc:16839 0xa16218 module_state::write(elf_out*, cpp_reader*) ../../gcc/cp/module.cc:17713 0xa168f5 finish_module_processing(cpp_reader*) ../../gcc/cp/module.cc:19728 0x9aaa8b c_parse_final_cleanups() ../../gcc/cp/decl2.c:5170 Please submit a full bug report, with preprocessed source if appropriate. Please include the complete backtrace with any bug report. See <https://gcc.gnu.org/bugs/> for instructions. gcc version root@748001480fc4:/src# g++ --version g++ (GCC) 11.0.0 20201218 (experimental) Copyright (C) 2020 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.