Re: [RFTesting] New POINTER_DIFF_EXPR

[Marc Glisse <marc.glisse@inria.fr>]

On Wed, 22 Nov 2017, Christophe Lyon wrote:

> Since you committed this patch (r255021), my cross-builds of GCC for
> aarch64-linux-gnu fail while building glibc:
> /tmp/6857183_6.tmpdir/aci-gcc-fsf/builds/gcc-fsf-gccsrc/tools/bin/aarch64-none-linux-gnu-gcc
> fetch-value.c -c -std=gnu99 -fgnu89-inline  -O2 -Wall -Winline -Wundef
> -Wwrite-string
> s -fmerge-all-constants -frounding-math -g -Wstrict-prototypes   -fPIC
>       -I../include
> -I/tmp/6857183_6.tmpdir/aci-gcc-fsf/builds/gcc-fsf-gccsrc/obj-aarch64-none-linux-gnu/gl
> ibc-1/nptl_db  -I/tmp/6857183_6.tmpdir/aci-gcc-fsf/builds/gcc-fsf-gccsrc/obj-aarch64-none-linux-gnu/glibc-1
> -I../sysdeps/unix/sysv/linux/aarch64/nptl  -I../sysdeps/unix/sysv/lin
> ux/aarch64  -I../sysdeps/unix/sysv/linux/generic
> -I../sysdeps/unix/sysv/linux/wordsize-64
> -I../nptl/sysdeps/unix/sysv/linux  -I../nptl/sysdeps/pthread
> -I../sysdeps/pthread  -I
> ../sysdeps/unix/sysv/linux  -I../sysdeps/gnu  -I../sysdeps/unix/inet
> -I../nptl/sysdeps/unix/sysv  -I../sysdeps/unix/sysv
> -I../nptl/sysdeps/unix  -I../sysdeps/unix  -I../sysdeps
> /posix  -I../sysdeps/aarch64/fpu  -I../sysdeps/aarch64/nptl
> -I../sysdeps/aarch64  -I../sysdeps/wordsize-64
> -I../sysdeps/ieee754/ldbl-128  -I../sysdeps/ieee754/dbl-64/wordsize-6
> 4  -I../sysdeps/ieee754/dbl-64  -I../sysdeps/ieee754/flt-32
> -I../sysdeps/aarch64/soft-fp  -I../sysdeps/ieee754
> -I../sysdeps/generic  -I../nptl  -I.. -I../libio -I. -nostdinc -i
> system /tmp/6857183_6.tmpdir/aci-gcc-fsf/builds/gcc-fsf-gccsrc/tools/lib/gcc/aarch64-none-linux-gnu/8.0.0/include
> -isystem /tmp/6857183_6.tmpdir/aci-gcc-fsf/builds/gcc-fsf-gccsrc
> /tools/lib/gcc/aarch64-none-linux-gnu/8.0.0/include-fixed -isystem
> /tmp/6857183_6.tmpdir/aci-gcc-fsf/builds/gcc-fsf-gccsrc/sysroot-aarch64-none-linux-gnu/usr/include
> -D_LIBC_REE
> NTRANT -include ../include/libc-symbols.h  -DPIC -DSHARED
> -DNOT_IN_libc=1 -DIS_IN_libthread_db=1 -DIN_LIB=libthread_db    -o
> /tmp/6857183_6.tmpdir/aci-gcc-fsf/builds/gcc-fsf-gccs
> rc/obj-aarch64-none-linux-gnu/glibc-1/nptl_db/fetch-value.os -MD -MP
> -MF /tmp/6857183_6.tmpdir/aci-gcc-fsf/builds/gcc-fsf-gccsrc/obj-aarch64-none-linux-gnu/glibc-1/nptl_db/fetch-
> value.os.dt -MT
> /tmp/6857183_6.tmpdir/aci-gcc-fsf/builds/gcc-fsf-gccsrc/obj-aarch64-none-linux-gnu/glibc-1/nptl_db/fetch-value.os
> during GIMPLE pass: vrp
> fetch-value.c: In function '_td_locate_field':
> fetch-value.c:44:1: internal compiler error: Segmentation fault
> _td_locate_field (td_thragent_t *ta,
> ^~~~~~~~~~~~~~~~
> 0xb87c75 crash_signal
>        /tmp/6857183_6.tmpdir/aci-gcc-fsf/sources/gcc-fsf/gccsrc/gcc/toplev.c:325
> 0x5b1934 contains_struct_check
>        /tmp/6857183_6.tmpdir/aci-gcc-fsf/sources/gcc-fsf/gccsrc/gcc/tree.h:3459
> 0x5b1934 wi::to_wide(tree_node const*)
>        /tmp/6857183_6.tmpdir/aci-gcc-fsf/sources/gcc-fsf/gccsrc/gcc/tree.h:5247
> 0xf05557 vr_values::two_valued_val_range_p(tree_node*, tree_node**, tree_node**)
>        /tmp/6857183_6.tmpdir/aci-gcc-fsf/sources/gcc-fsf/gccsrc/gcc/vr-values.c:4051
> 0xf0ee48 vr_values::simplify_stmt_using_ranges(gimple_stmt_iterator*)
>        /tmp/6857183_6.tmpdir/aci-gcc-fsf/sources/gcc-fsf/gccsrc/gcc/vr-values.c:4115
> 0xd7068f substitute_and_fold_dom_walker::before_dom_children(basic_block_def*)
>        /tmp/6857183_6.tmpdir/aci-gcc-fsf/sources/gcc-fsf/gccsrc/gcc/tree-ssa-propagate.c:1073
> 0x1204860 dom_walker::walk(basic_block_def*)
>        /tmp/6857183_6.tmpdir/aci-gcc-fsf/sources/gcc-fsf/gccsrc/gcc/domwalk.c:308
> 0xd6e805 substitute_and_fold_engine::substitute_and_fold()
>        /tmp/6857183_6.tmpdir/aci-gcc-fsf/sources/gcc-fsf/gccsrc/gcc/tree-ssa-propagate.c:1173
> 0xe71b0b vrp_prop::vrp_finalize(bool)
>        /tmp/6857183_6.tmpdir/aci-gcc-fsf/sources/gcc-fsf/gccsrc/gcc/tree-vrp.c:6788
> 0xe81667 execute_vrp
>        /tmp/6857183_6.tmpdir/aci-gcc-fsf/sources/gcc-fsf/gccsrc/gcc/tree-vrp.c:6864
> Please submit a full bug report,

Looks like PR 83104.

(I am a bit curious what the code looks like, since the testcase in the PR 
is rather on the undefined side of things, though ok for something 
embedded)

-- 
Marc Glisse