[Bug bootstrap/92540] New: [10 regression] r278218 breaks bootstrap on riscv64

[schwab@linux-m68k.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92540

            Bug ID: 92540
           Summary: [10 regression] r278218 breaks bootstrap on riscv64
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Keywords: build, diagnostic
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: schwab@linux-m68k.org
                CC: mliska at suse dot cz
            Blocks: 24639
  Target Milestone: ---
            Target: riscv64-*-*

../../gcc/config/riscv/riscv.c: In function 'int riscv_address_insns(rtx,
machine_mode, bool)':
../../gcc/config/riscv/riscv.c:860:29: error: '*((void*)& addr +24)' may be
used uninitialized in this function [-Werror=maybe-uninitialized]
  860 |   struct riscv_address_info addr;
      |                             ^~~~

GCC doesn't see that if addr.type == ADDRESS_LO_SUM then addr.symbol_type is
initialized by riscv_classify_address.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=24639
[Bug 24639] [meta-bug] bug to track all Wuninitialized issues