illegal instruction when compiling ocaml #12903
Description
When building OCaml 5.1.1 on OpenBSD 7.4:
$ ./configure && gmake
...
gmake[4]: Entering directory '/home/michael/src/ocaml/otherlibs/dynlink'
../../ocamlc.opt -nostdlib -I ../../stdlib -g -c -for-pack Dynlink_compilerlibs -strict-sequence -principal -absname -w +a-4-9-40-41-42-44-45-48 -warn-error +A -bin-annot -strict-formats -I byte \
-I dynlink_compilerlibs -o dynlink_compilerlibs/binutils.cmo dynlink_compilerlibs/binutils.ml
gmake[4]: *** [Makefile:188: dynlink_compilerlibs/binutils.cmo] Illegal instruction (core dumped)
This machine has an Intel Core i7-1280P processor. I also get an illegal instruction error when building OCaml 5.1.1, 5.0.0, 4.14.1, and trunk on this machine. However, I routinely build OCaml on another OpenBSD 7.4 machine without trouble. That one has a Core i5-5200U.
Here's some info from gdb:
$ gdb ../../ocamlc.opt ocamlc.opt.core
GNU gdb 6.3
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GDB is free software, covered by the GNU General Public License, and you are
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Type "show copying" to see the conditions.
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This GDB was configured as "amd64-unknown-openbsd7.4"...
Core was generated by `ocamlc.opt'.
Program terminated with signal 4, Illegal instruction.
Reading symbols from /usr/lib/libpthread.so.27.1...done.
Loaded symbols for /usr/lib/libpthread.so.27.1
Loaded symbols for /home/michael/src/ocaml/ocamlc.opt
Reading symbols from /usr/lib/libm.so.10.1...done.
Loaded symbols for /usr/lib/libm.so.10.1
Symbols already loaded for /usr/lib/libpthread.so.27.1
Reading symbols from /usr/lib/libc.so.97.1...done.
Loaded symbols for /usr/lib/libc.so.97.1
Reading symbols from /usr/libexec/ld.so...Error while reading shared library symbols:
Dwarf Error: wrong version in compilation unit header (is 4, should be 2) [in module /usr/libexec/ld.so]
#0 0x000003ca249101a0 in caml_startup.code_begin () from /home/michael/src/ocaml/ocamlc.opt
(gdb) bt
#0 0x000003ca249101a0 in caml_startup.code_begin () from /home/michael/src/ocaml/ocamlc.opt
#1 0x000003ca24c77948 in caml_start_program () from /home/michael/src/ocaml/ocamlc.opt
#2 0x000003ca24c771ce in caml_startup_common (argv=Variable "argv" is not available.
) at runtime/startup_nat.c:132
#3 0x000003ca24c7727d in caml_main (argv=Variable "argv" is not available.
) at runtime/startup_nat.c:139
#4 0x000003ca24c5e510 in main (argc=Unhandled dwarf expression opcode 0xa3
) at runtime/main.c:37
(gdb) info registers
rax 0x3cd0c4d8dc8 4179209588168
rbx 0x3cc6c468620 4176524772896
rcx 0x3ccb5a48df0 4177755672048
rdx 0x22 34
rsi 0x0 0
rdi 0x3cd0c4d1800 4179209558016
rbp 0x7e0329bf8e20 0x7e0329bf8e20
rsp 0x3ccb71e6018 0x3ccb71e6018
r8 0x1ff 511
r9 0x1 1
r10 0x3ccb71e6020 4177780432928
r11 0x0 0
r12 0x3ca249101a0 4166731760032
r13 0x3cc6c36f770 4176523753328
r14 0x3cd0c4d1800 4179209558016
r15 0x3ccfb5f8ce0 4178925554912
rip 0x3ca249101a0 0x3ca249101a0 <caml_startup.code_begin>
eflags 0x10202 66050
cs 0x2b 43
ss 0x23 35
ds 0x23 35
es 0x23 35
fs 0x23 35
gs 0x23 35
(gdb) x/i $rip
0x3ca249101a0 <caml_startup.code_begin>: lea 0xfffffffffffffec0(%rsp),%r10
Do you need any additional information from gdb? I'm happy to apply patches or try anything else to help. Thanks.