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Subject: [Bug debug/99230] New: [11 Regression] gcc.dg/pr83527.c excess
 errors: '-fcompare-debug' failure (length)
Date: Tue, 23 Feb 2021 21:40:31 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99230

            Bug ID: 99230
           Summary: [11 Regression] gcc.dg/pr83527.c excess errors:
                    '-fcompare-debug' failure (length)
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hp at gcc dot gnu.org
                CC: aoliva at gcc dot gnu.org, sandra at gcc dot gnu.org
  Target Milestone: ---
              Host: x86_64-linux
            Target: cris-elf

This test started to fail for cris-elf almost identically to the descriptio=
n in
PR83527 since 3696a50beeb73f4 / r11-3302 "Change C front end to emit struct=
ured
loop and switch tree nodes", but I don't see this failure for other targets=
 in
the gcc-testresults@ archives (at least no search engine hits) and I can't =
find
an obvious target description oddity related to switches or case-tables.

Build machine is x86_64 stock Debian 9.  A brief look at the commit fixing
PR83527 (18408e962e5a) didn't help with applying that to the mentioned swit=
ch
rewrite.

No extra tools are needed to repeat the problem, just configure with  e.g.
"--target=3Dcris-elf --enable-languages=3Dc" and
"make all-gcc" then "make check-gcc-c RUNTESTFLAGS=3Ddg.exp=3Dpr83527.c"

(I use --target_board=3Dcris-sim usually but that can be elided for this te=
st.)

Perhaps of interest:
--- pr83527.gk.c.gkd    2021-02-23 16:02:07.985669417 +0100
+++ pr83527.c.gkd       2021-02-23 16:02:07.973669826 +0100
@@ -7,7 +7,7 @@ Declarations used by fn1, sorted by DECL
 5:   void <L0>;
 2:   void <L1>;
 3:   void <L2>;
-1:   void <L9>;
+1:   void <L10>;

 ;; Function fn1 (fn1, funcdef_no=3D0, cgraph_uid=3D1, symbol_order=3D2)

Testsuite run:
Running /x/gcc/gcc/testsuite/gcc.dg/dg.exp ...
... (lines elided)
FAIL: gcc.dg/pr83527.c (test for excess errors)

>>From gcc.log:
xgcc: error: /x/gcc/gcc/testsuite/gcc.dg/pr83527.c: '-fcompare-debug' failu=
re
(length)=