Re: FYI: Latest gcc-8 snapshot gives ICE with later isl's

[Marek Polacek <polacek at redhat dot com>]

On Mon, Mar 05, 2018 at 12:58:23PM -0500, Donald Parsons wrote:
> 
> I am getting ICE bootstrapping gcc-8-20180304.tar.xz when using either
> isl-0.18 or isl-0.19.   I had never had a problem using latest isl over
> the past couple of years, so a change in gcc last week introduced the
> problem.
> 
> Normally I disable-bootstrap and use last weeks gcc-8 to build this
> weeks gcc-8 and avoid the extra long bootstrap time.  This actually
> worked, at least with isl-0.18 but the resulting gcc-8 gave ICE errors
> building latest "pari-gp" and the latest-rc4 Linux kernel.  So went
> back to bootstrapping with (Redhat gcc-7.3.1-2) and discovered the
> above.
> 
> Here is failure (using isl-0.18; 0.19 looks same):
> ...
> libtool: compile:  /home/don/src/gcc-8-20180304-obj/./prev-gcc/xgcc
> -B/home/don/src/gcc-8-20180304-obj/./prev-gcc/ -B/opt/gcc/gcc-8-
> 0304/x86_64-redhat-linux/bin/ -B/opt/gcc/gcc-8-0304/x86_64-redhat-
> linux/bin/ -B/opt/gcc/gcc-8-0304/x86_64-redhat-linux/lib/ -isystem
> /opt/gcc/gcc-8-0304/x86_64-redhat-linux/include -isystem /opt/gcc/gcc-
> 8-0304/x86_64-redhat-linux/sys-include -DHAVE_CONFIG_H -I. -I../../gcc-
> 8-20180304/isl -I../../gcc-8-20180304/isl/include -Iinclude/ -g -O2
> -gtoggle -MT isl_factorization.lo -MD -MP -MF
> .deps/isl_factorization.Tpo -c ../../gcc-8-
> 20180304/isl/isl_factorization.c -o isl_factorization.o
> during GIMPLE pass: pre
> ../../gcc-8-20180304/isl/isl_factorization.c: In function
> 'isl_basic_set_factorizer':
> ../../gcc-8-20180304/isl/isl_factorization.c:256:28: internal compiler
> error: in compute_antic_aux, at tree-ssa-pre.c:2148
>  __isl_give isl_factorizer *isl_basic_set_factorizer(
>                             ^~~~~~~~~~~~~~~~~~~~~~~~
> 0x11e6790 compute_antic_aux
> 	../../gcc-8-20180304/gcc/tree-ssa-pre.c:2148
> 0x11e713b compute_antic
> 	../../gcc-8-20180304/gcc/tree-ssa-pre.c:2364
> 0x11ec1b1 execute
> 	../../gcc-8-20180304/gcc/tree-ssa-pre.c:4131
> Please submit a full bug report,
> with preprocessed source if appropriate.
> Please include the complete backtrace with any bug report.
> See <https://gcc.gnu.org/bugs/> for instructions.
> make[5]: *** [Makefile:1463: isl_factorization.lo] Error 1
> make[5]: Leaving directory '/home/don/src/gcc-8-20180304-obj/isl'
> make[4]: *** [Makefile:1571: all-recursive] Error 1
> make[4]: Leaving directory '/home/don/src/gcc-8-20180304-obj/isl'
> make[3]: *** [Makefile:1167: all] Error 2
> make[3]: Leaving directory '/home/don/src/gcc-8-20180304-obj/isl'
> make[2]: *** [Makefile:6155: all-stage2-isl] Error 2
> make[2]: Leaving directory '/home/don/src/gcc-8-20180304-obj'
> make[1]: *** [Makefile:25157: stage2-bubble] Error 2
> make[1]: Leaving directory '/home/don/src/gcc-8-20180304-obj'
> make: *** [Makefile:947: all] Error 2

I bet this is https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84670 which is already
fixed.

	Marek