Re: [gentoo-user] Does gcc 11.3 need a special/new kernel version?

[Matthias Hanft]

Mickaël Bucas wrote:
>
> It seems that the command line to compile "genautomata" contains useful information to understand the cause.
> Can you find it in the GCC compile logs ?

I think the command which triggers the error is "build/genautomata ...":

make[3]: Entering directory '/var/tmp/portage/sys-devel/gcc-11.3.0/work/build/gcc'
build/genautomata /var/tmp/portage/sys-devel/gcc-11.3.0/work/gcc-11.3.0/gcc/common.md /var/tmp/portage/sys-devel/gcc-11.3.0/work/gcc-11.3.0/gcc/config/i386/i386.md \
  insn-conditions.md > tmp-automata.c
make[3]: *** [Makefile:2456: s-automata] Error 139
make[3]: Leaving directory '/var/tmp/portage/sys-devel/gcc-11.3.0/work/build/gcc'
make[3]: *** Waiting for unfinished jobs....

dmesg:
[10789.040085] genautomata[5619]: segfault at bfa80ffc ip b775f23b sp bfa81000 error 6 in genautomata[b7755000+44000]

Former lines in "build.log" containing "genautomata" are just these two:

i686-pc-linux-gnu-g++ -std=c++11 -c -DEXTRA_OPTIONS      -DIN_GCC     -fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wno-error=format-diag
-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/var/tmp/portage/sys-devel/gcc-11.3.0/work/gcc-11.3.0/gcc -I/var/tmp/portage/sys-devel/gcc-11.3.0/work/gcc-11.3.0/gcc/build -I/var/tmp/portage/sys-devel/gcc-11.3.0/work/gcc-11.3.0/gcc/../include
-I/var/tmp/portage/sys-devel/gcc-11.3.0/work/gcc-11.3.0/gcc/../libcpp/include  \
        -o build/genautomata.o /var/tmp/portage/sys-devel/gcc-11.3.0/work/gcc-11.3.0/gcc/genautomata.c

and, a bit later

i686-pc-linux-gnu-g++ -std=c++11 -DEXTRA_OPTIONS      -DIN_GCC     -fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wno-error=format-diag
-Wno-format -Wmissing-format-attribute -Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings   -DHAVE_CONFIG_H  -DGENERATOR_FILE -static-libstdc++ -static-libgcc
-Wl,-O1 -Wl,--as-needed -o build/genautomata \
    build/genautomata.o build/rtl.o build/read-rtl.o build/ggc-none.o build/vec.o build/min-insn-modes.o build/gensupport.o build/print-rtl.o build/hash-table.o build/sort.o build/read-md.o
build/errors.o ../build-i686-pc-linux-gnu/libiberty/libiberty.a -lm

which both just look normal, IMHO (no error or other message around them).

Meanwhile, I have updated several other Gentoo systems (32 and 64
bit) which all worked well. It's just that one system which brings
that error. I have also found https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79827
and made "ulimit -s 32768" (instead of 8192), but to no avail.

The only difference is the kernel (4.0.5 on the old system; all others
have 4.14.83 oder even some 5.x kernel). On the other hand: the difference
between gcc 11.2.1 (which works fine) and 11.3.0 shouldn't be that big?!

-Matt