https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109660
Bug ID: 109660 Summary: module path inconsistency Product: gcc Version: 12.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: jbeulich at suse dot com Target Milestone: --- The pathname underneath gcm.cache/ is determined from the effective name used for the main input file of a particular module. When modules are built, no canonicalization occurs for the main input file. Hence the module file wouldn't be found if a different (the canonicalized) file name was used when importing that same module. This is an effect of importing happening in the preprocessor, just like #include handling. See also (and quoted from) commit d76c343d6a62 working around the issue in the testsuite.