>Synopsis: <synopsis of the problem (one line)>
>Category: <PR category (one line)>
>Environment:
System : OpenBSD 7.7
Details : OpenBSD 7.7-current (GENERIC.MP) #35: Fri Aug 1 15:38:45
MDT 2025
[email protected]:/usr/src/sys/arch/sparc64/compile/GENERIC.MP
Architecture: OpenBSD.sparc64
Machine : sparc64
>Description:
I had discovered that our ld is a root cause why we can't use latest
gcc on sparc64 platform.
gcc can be bootstraped up to this commit:
https://gcc.gnu.org/cgit/gcc/commit/?id=9b884225bfc609606f9b169b021c4da93feba48e
If I remove introduced condition
if (!cmp_type || iv_precision > TYPE_PRECISION (cmp_type))
I can build it for the next few commits, until it explode again as:
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x000000a31e861600 in
_ZN4bidi7contextC1Ev+0xfffffffffb59ea0c@plt ()
(gdb) disassemble
Dump of assembler code for function
_ZN4bidi7contextC1Ev+0xfffffffffb59ea0c@plt:
0x000000a31e8615f0 <+0>: mov %o7, %g5
0x000000a31e8615f4 <+4>: call 0xa31e8615fc
<_ZN4bidi7contextC1Ev+0xfffffffffb59ea0c@plt+12>
0x000000a31e8615f8 <+8>: nop
0x000000a31e8615fc <+12>: ldx [ %o7 + 0x65c ], %g1
=> 0x000000a31e861600 <+16>: jmpl %o7 + %g1, %g1
0x000000a31e861604 <+20>: mov %g5, %o7
End of assembler dump.
(gdb) p/x $o7 + 0x65c
$1 = 0xa31e861c50
(gdb) x/x $o7 + 0x65c
0xa31e861c50 <[email protected]>: 0xf9e379e0
(gdb) p/x $o7 + $g1
$2 = 0xf9e37a841e6ff100
(gdb) x/x $o7 + $g1
0xf9e37a841e6ff100: Cannot access memory at address
0xf9e37a841e6ff100
(gdb) x/x $g1
0xf9e379e0ffe9db0c: Cannot access memory at address
0xf9e379e0ffe9db0c
(gdb) p/x $g1
$3 = 0xf9e379e0ffe9db0c
(gdb)
Different commits of gcc leads to a different place where it
explodes, but it always a code like this.
More of that, if I build the first compiler without PIE, by removing
--enable-host-pie, it leads to a crash in ld:
/usr/local/bootstrap-gcc/bin/g++ -std=c++14 -fno-PIE -c
-DIN_GCC_FRONTEND -g -DIN_GCC -fno-exceptions -fno-rtti
-fasynchronous-unwind-tables -W -Wall -Wno-error=narrowing -Wwrite-strings
-Wcast-qual -Wno-format -Wmissing-format-attribute -Wconditionally-supported
-Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros
-Wno-overlength-strings -DHAVE_CONFIG_H -fno-PIE -I. -I.
-I/usr/ports/pobj/gcc-15.2.0/gcc-15.2.0/gcc
-I/usr/ports/pobj/gcc-15.2.0/gcc-15.2.0/gcc/.
-I/usr/ports/pobj/gcc-15.2.0/gcc-15.2.0/gcc/../include
-I/usr/ports/pobj/gcc-15.2.0/gcc-15.2.0/gcc/../libcpp/include
-I/usr/ports/pobj/gcc-15.2.0/gcc-15.2.0/gcc/../libcody -I/usr/local/include
-I/usr/ports/pobj/gcc-15.2.0/gcc-15.2.0/gcc/../libdecnumber
-I/usr/ports/pobj/gcc-15.2.0/gcc-15.2.0/gcc/../libdecnumber/dpd
-I../libdecnumber -I/usr/ports/pobj/gcc-15.2.0/gcc-15.2.0/gcc/../libbacktrace
-o cc1-checksum.o -MT cc1-checksum.o -MMD -MP -MF ./.deps/cc1-checksum.TPo
cc1-checksum.cc
/usr/local/bootstrap-gcc/bin/g++ -std=c++14 -no-pie -g -DIN_GCC
-fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall
-Wno-error=narrowing -Wwrite-strings -Wcast-qual -Wno-format
-Wmissing-format-attribute -Wconditionally-supported -Woverloaded-virtual
-pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings
-DHAVE_CONFIG_H -no-pie -static-libstdc++ -static-libgcc -o cc1 c/c-lang.o
c-family/stub-objc.o attribs.o c/c-errors.o c/c-decl.o c/c-typeck.o
c/c-convert.o c/c-aux-info.o c/c-objc-common.o c/c-parser.o c/c-fold.o
c/gimple-parser.o c-family/c-common.o c-family/c-cppbuiltin.o c-family/c-dump.o
c-family/c-format.o c-family/c-gimplify.o c-family/c-indentation.o
c-family/c-lex.o c-family/c-omp.o c-family/c-opts.o c-family/c-pch.o
c-family/c-ppoutput.o c-family/c-pragma.o c-family/c-pretty-print.o
c-family/c-semantics.o c-family/c-ada-spec.o c-family/c-ubsan.o
c-family/known-headers.o c-family/c-attribs.o c-family/c-warn.o
c-family/c-spellcheck.o c-fa
mily/c-type-mismatch.o sparc-c.o default-c.o \
cc1-checksum.o simple-diagnostic-path.o lazy-diagnostic-path.o
libbackend.a main.o libcommon-target.a libcommon.a ../libcpp/libcpp.a
../libdecnumber/libdecnumber.a libcommon.a ../libcpp/libcpp.a
../libbacktrace/.libs/libbacktrace.a ../libiberty/libiberty.a
../libdecnumber/libdecnumber.a -L/usr/local/lib -lmpc -lmpfr -lgmp -rdynamic
-lz
collect2: fatal error: ld terminated with signal 11 [Segmentation
fault], core dumped
with absolutle useless stacktrace inside core:
Core was generated by `ld.bfd'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x00000099a352bb48 in bfd_putb64 ()
(gdb) bt
#0 0x00000099a352bb48 in bfd_putb64 ()
#1 0x00000099a3544fb8 in bfd_elf64_swap_reloca_out ()
#2 0x00000099a353e644 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt
stack?)
(gdb)
I had tried to use clang-19, both from /usr/bin/clang and ports with
the same result. I've tried to use gas with the same result.
>How-To-Repeat:
Try to build lang/gcc/15 from ports.
>Fix:
No idea
dmesg:
OpenBSD 7.7-current (GENERIC.MP) #35: Fri Aug 1 15:38:45 MDT 2025
[email protected]:/usr/src/sys/arch/sparc64/compile/GENERIC.MP
real mem = 8053063680 (7680MB)
avail mem = 7882203136 (7517MB)
random: good seed from bootblocks
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root: SPARC T4-1
cpu0 at mainbus0: SPARC-T4 (rev 0.0) @ 2847.862 MHz
cpu1 at mainbus0: SPARC-T4 (rev 0.0) @ 2847.862 MHz
cpu2 at mainbus0: SPARC-T4 (rev 0.0) @ 2847.862 MHz
cpu3 at mainbus0: SPARC-T4 (rev 0.0) @ 2847.862 MHz
cpu4 at mainbus0: SPARC-T4 (rev 0.0) @ 2847.862 MHz
cpu5 at mainbus0: SPARC-T4 (rev 0.0) @ 2847.862 MHz
cpu6 at mainbus0: SPARC-T4 (rev 0.0) @ 2847.862 MHz
cpu7 at mainbus0: SPARC-T4 (rev 0.0) @ 2847.862 MHz
"reboot-memory" at mainbus0 not configured
vbus0 at mainbus0
"flashprom" at vbus0 not configured
vrng0 at vbus0
cbus0 at vbus0
vdsk0 at cbus0 chan 0x2: ivec 0x4, 0x5
scsibus1 at vdsk0: 1 targets
sd0 at scsibus1 targ 0 lun 0: <SUN, Virtual Disk, 1.1>
sd0: 3MB, 512 bytes/sector, 6400 sectors
vnet0 at cbus0 chan 0x3: ivec 0x6, 0x7, address 00:14:4f:f8:f2:08
vcons0 at vbus0: ivec 0x8011: console
vrtc0 at vbus0
vpci0 at mainbus0: bus 0 to 255, dvma map 80000000-ffffffff
pci0 at vpci0
ppb0 at pci0 dev 2 function 0 "Sun SDIO PCIE" rev 0x01
pci1 at ppb0 bus 7
ppb1 at pci1 dev 0 function 0 "Sun SDIO PCIE" rev 0x01
pci2 at ppb1 bus 8
ppb2 at pci2 dev 4 function 0 "Sun SDIO PCIE" rev 0x01
pci3 at ppb2 bus 11
mpii0 at pci3 dev 0 function 0 "Symbios Logic SAS2008" rev 0x03: msi
mpii0: RF On-Board, firmware 9.0.0.0 IR, MPI 2.0
scsibus2 at mpii0: 834 targets
ppb3 at pci2 dev 7 function 0 "Sun SDIO PCIE" rev 0x01
pci4 at ppb3 bus 13
em0 at pci4 dev 0 function 0 "Intel 82576" rev 0x01: msi, address
00:10:e0:10:2e:5a
em1 at pci4 dev 0 function 1 "Intel 82576" rev 0x01: msi, address
00:10:e0:10:2e:5b
sd1 at scsibus2 targ 2 lun 0: <HITACHI, H109030SESUN300G, A31A>
naa.5000cca0220f386c
sd1: 286102MB, 512 bytes/sector, 585937500 sectors
vscsi0 at root
scsibus3 at vscsi0: 256 targets
softraid0 at root
scsibus4 at softraid0: 256 targets
bootpath: /pci@400,0/pci@2,0/pci@0,0/pci@4,0/scsi@0,0/disk@5000cca0220f386d,0
root on sd1a (d5d2548c40f337c0.a) swap on sd1b dump on sd1b
cd0 at scsibus2 targ 8 lun 0: <TEAC, DV-W28SS-V, 1.0B> removable
sd2 at scsibus2 targ 3 lun 0: <HITACHI, H109030SESUN300G, A31A>
naa.5000cca0221ac484
sd2: 286102MB, 512 bytes/sector, 585937500 sectors
usbdevs:
usbdevs: no USB controllers found
--
wbr, Kirill
