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While testing future 64-bit location_t support, I ran into an -fcompare-debug issue that was traced back here. Despite the name, next_discriminator_for_locus() is meant to take an integer line number argument, not a location_t. There is one call site which has been passing a location_t instead. For the most part that is harmless, although in case there are two CALL stmts on the same line with different location_t, it may fail to generate a unique discriminator where it should. If/when location_t changes to be 64-bit, however, it will produce an -fcompare-debug failure. Fix it by passing the line number rather than the location_t. I am not aware of a testcase that demonstrates any observable wrong behavior, but the file debug/pr53466.C is an example where the discriminator assignment is indeed different before and after this change. gcc/ChangeLog: * tree-cfg.cc (assign_discriminators): Fix incorrect value passed to next_discriminator_for_locus(). |
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