https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85838
Bug ID: 85838
Summary: -Wmaybe-uninitialized warning in sparc.c
(sparc_expand_builtin) breaks SPARC bootstrap
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: bootstrap
Assignee: unassigned at gcc dot gnu.org
Reporter: ro at gcc dot gnu.org
CC: ebotcazou at gcc dot gnu.org, rguenth at gcc dot gnu.org
Target Milestone: ---
Host: sparc-sun-solaris2.*
Target: sparc-sun-solaris2.*
Build: sparc-sun-solaris2.*
Between 20180517 (r260326) and 20180518 (r260354), Solaris/SPARC bootstrap got
broken. Compiling sparc.c in stage2 gives
In file included from /vol/gcc/src/hg/trunk/local/gcc/config/sparc/sparc.c:42:
/vol/gcc/src/hg/trunk/local/gcc/recog.h: In function 'rtx_def*
sparc_expand_builtin(tree, rtx, rtx, machine_mode, int)':
/vol/gcc/src/hg/trunk/local/gcc/recog.h:303:85: error: 'op[0]' may be used
uninitialized in this function [-Werror=maybe-uninitialized]
rtx_insn * operator () (rtx a0, rtx a1, rtx a2, rtx a3) const { return
((f4)func) (a0, a1, a2, a3); }
~~~~~~~~~~~^~~~~~~~~~~~~~~~
/vol/gcc/src/hg/trunk/local/gcc/config/sparc/sparc.c:11595:12: note: 'op[0]'
was declared here
rtx pat, op[4];
^~
A reghunt identified this patch
2018-05-18 Richard Biener <rguent...@suse.de>
* tree-dfa.c (get_ref_base_and_extent): Use range-info to refine
results when processing array refs with variable index.
as the culprit.
