[Bug bootstrap/66038] [5 regression] (stage 2) build/genmatch issue (gcc/hash-table.h|c) with --disable-checking [ introduced by r218976 ]

[kumba at gentoo dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66038

Joshua Kinard <kumba at gentoo dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kumba at gentoo dot org

--- Comment #23 from Joshua Kinard <kumba at gentoo dot org> ---
I ran into this on a Linux/mips64 (MIPS-IV ISA) build as well, running N32 ABI.

mips64-unknown-linux-gnu-g++ -c      -DIN_GCC    -fno-exceptions -fno-rtti
-fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings
-Wcast-qual -Wno-format -Wmissing-format-attribute -Woverloaded-virtual
-pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings  
-DHAVE_CONFIG_H -DGENERATOR_FILE -I. -Ibuild
-I/usr/obj/portage/sys-devel/gcc-5.1.0/work/gcc-5.1.0/gcc
-I/usr/obj/portage/sys-devel/gcc-5.1.0/work/gcc-5.1.0/gcc/build
-I/usr/obj/portage/sys-devel/gcc-5.1.0/work/gcc-5.1.0/gcc/../include 
-I/usr/obj/portage/sys-devel/gcc-5.1.0/work/gcc-5.1.0/gcc/../libcpp/include  \
        -o build/gcov-iov.o
/usr/obj/portage/sys-devel/gcc-5.1.0/work/gcc-5.1.0/gcc/gcov-iov.c
build/genmatch --gimple
/usr/obj/portage/sys-devel/gcc-5.1.0/work/gcc-5.1.0/gcc/match.pd \
    > tmp-gimple-match.c
/bin/bash: line 1:   835 Segmentation fault      build/genmatch --gimple
/usr/obj/portage/sys-devel/gcc-5.1.0/work/gcc-5.1.0/gcc/match.pd >
tmp-gimple-match.c
Makefile:2318: recipe for target 's-match' failed
make[3]: *** [s-match] Error 139
make[3]: *** Waiting for unfinished jobs....

This is in the 'all-stage1-gcc' stage from 'stage1-bubble'.  I did not see any
'ld' warnings prior to that, but I have this in dmesg:

[47163.043326]
               do_page_fault(): sending SIGSEGV to genmatch for invalid read
access from 0000000000000000
[47163.043354] epc = 0000000000000000 in
[47163.043402]  genmatch[10000000+90000]
[47163.043412] ra  = 000000001000b960 in
[47163.043436]  genmatch[10000000+90000]

Running a 64KB PAGE_SIZE, too, if that matters.  I'll try to reverse commit
r218976 from Comment #11 to see if that resolves the issue for me as well and
update later.