https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87836
--- Comment #16 from Gary Mills <gary_mills at fastmail dot fm> ---
I have a clue now. I built gcc-7 on OI-SPARC with the GNU assembler. The
build
was successful. xgcc worked, without the ICE. Clearly the ICE only happens
when gcc-7 is configured with the native assembler. This is the usual
configuration on SPARC hardware.
Then I built gcc-7 on OI-x86 with the native assembler. This is the opposite
of
the normal configuration. It failed with the ICE. xgcc by itself gets the
same
ICE.
My conclusion is that the ICE only occurs when gcc-7 is configured with the
native
assembler. It doesn't matter if the hardware is SPARC or x86. The fatal
configuration is with:
--without-gnu-as --with-as=/usr/bin/as
Something happens in that case that passes a null pointer to functions that
dereference it and cause the ICE.
Note that the assembler is not actually invoked. My test uses the -S option
that causes the assembly output to be placed in a file. xgcc still fails if
the
native assembler is configured.
Anybody should be able to reproduce this problem. My guess is a logic error.
