I was trying to bootstrap GCC rev. 158136 with a different BOOT_CFLAGS:
--- a/Makefile.in
+++ b/Makefile.in
@@ -352,7 +352,7 @@ BUILD_PREFIX_1 = @BUILD_PREFIX_1@
# Flags to pass to stage2 and later makes. They are defined
# here so that they can be overridden by Makefile fragments.
-BOOT_CFLAGS= -g -O2
+BOOT_CFLAGS= -g -O3 -msse2
BOOT_LDFLAGS=
BOOT_ADAFLAGS=-gnatpg -gnata
The bootstrap stops during the compilation of builtins.c with this error:
cc1: warnings being treated as errors
../../gcc/builtins.c: In function ‘builtin_strncpy_read_str’:
../../gcc/builtins.c:567:37: error: array subscript is above array bounds
This is error comes from one of VRP's checks.
--
Summary: Bootstrap broken at -O3
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: bootstrap
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: spop at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43737
