sparcv9 bootstrap has been broken for 1 1/2 years now by spurious
-Wuninitialized warnings:
In function ‘wide_int wi::max_value(unsigned int, signop)’,
inlined from ‘wide_int wi::max_value(unsigned int, signop)’ at
/vol/gcc/src/hg/master/local/gcc/wide-int.cc:330:1:
/vol/gcc/src/hg/master/local/gcc/wide-int.cc:335:31: error:
‘<anonymous>.generic_wide_int<wide_int_storage>::<anonymous>.wide_int_storage::val[1]’
may be used uninitialized [-Werror=maybe-uninitialized]
335 | return shwi (-1, precision);
| ^
[...]
In function ‘wide_int get_nonzero_bits(const_tree)’,
inlined from ‘wide_int get_nonzero_bits(const_tree)’ at
/vol/gcc/src/hg/master/local/gcc/tree-ssanames.c:531:1:
/vol/gcc/src/hg/master/local/gcc/tree-ssanames.c:544:67: error:
‘<anonymous>.generic_wide_int<wide_int_storage>::<anonymous>.wide_int_storage::val[1]’
may be used uninitialized [-Werror=maybe-uninitialized]
544 | | (HOST_WIDE_INT) pi->misalign, precision);
| ^
[...]
Before we ship yet another release with this issue, I suggest to at
least include a workaround of demoting them to warnings.
Tested on sparcv9-sun-solaris2.11.
Ok for master?
I originally meant to propose the patch for the gcc-10 branch as well,
but when I tried a sparcv9-sun-solaris2.11 bootstrap there some time
ago, it wasn't affected any longer.
Rainer
--
-----------------------------------------------------------------------------
Rainer Orth, Center for Biotechnology, Bielefeld University
2021-03-03 Rainer Orth <r...@cebitec.uni-bielefeld.de>
gcc:
PR bootstrap/92002
* config/sparc/t-sparc (tree-ssanames.o-warn): Don't error for
-Wuninitialized, -Wmaybe-uninitialized.
(wide-int.o-warn): Likewise.
# HG changeset patch
# Parent 710ee5be5a4d126389146bc2e4ab9bbcc36a44e1
Hack around 64-bit SPARC bootstrap failure (PR bootstrap/92002)
diff --git a/gcc/config/sparc/t-sparc b/gcc/config/sparc/t-sparc
--- a/gcc/config/sparc/t-sparc
+++ b/gcc/config/sparc/t-sparc
@@ -27,3 +27,7 @@ sparc-c.o: $(srcdir)/config/sparc/sparc-
sparc-d.o: $(srcdir)/config/sparc/sparc-d.c
$(COMPILE) $<
$(POSTCOMPILE)
+
+# Hack around PR bootstrap/92002.
+tree-ssanames.o-warn += -Wno-error=uninitialized -Wno-error=maybe-uninitialized
+wide-int.o-warn += -Wno-error=uninitialized -Wno-error=maybe-uninitialized
