[Bug testsuite/69586] New: FAIL: gcc.dg/uninit-21.c for target defaulting to short enum

[thopre01 at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69586

            Bug ID: 69586
           Summary: FAIL: gcc.dg/uninit-21.c for target defaulting to
                    short enum
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: testsuite
          Assignee: unassigned at gcc dot gnu.org
          Reporter: thopre01 at gcc dot gnu.org
                CC: rguenther at suse dot de
  Target Milestone: ---
            Target: arm-none-eabi

Created attachment 37537
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37537&action=edit
Dump of failing uninit1 pass

Hi,

The new gcc.dg/uninit-21.c fails on arm-none-eabi with the following error:

gcc/testsuite/gcc.dg/uninit-21.c: In function 'yp_update':
gcc/testsuite/gcc.dg/uninit-21.c:31:3: warning: 'master' may be used
uninitialized in this function [-Wmaybe-uninitialized]
FAIL: gcc.dg/uninit-21.c  (test for bogus messages, line 31)

The test succeeds if passing -fno-short-enum or giving RPC_CANTENCODEARGS a
value to big to represent with an unsigned short (65536 or higher) due to the
cast creating confusing. See attached dump of uninit1 pass. The second cast
using a bitwise and with 255 starts from forwprop1.

Best regards.