[Bug middle-end/68117] [6 Regression] error: invalid PHI argument <<< Unknown tree: <invalid tree code> >>>

[gary at intrepid dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68117

--- Comment #17 from Gary Funck <gary at intrepid dot com> ---
We're seeing this ICE on x86-64, while building the 32-bit libgfortran.
We're building the target libraries with -O3 with GCC compiler checks enabled.

libtool: compile:  /eng/upc/dev/gary/gupc-dev/bld/gupc/./gcc/xgcc -B/eng/upc/de
v/gary/gupc-dev/bld/gupc/./gcc/ -B/eng/upc/dev/gary/gupc-dev/rls/gupc/x86_64-pc
-linux-gnu/bin/ -B/eng/upc/dev/gary/gupc-dev/rls/gupc/x86_64-pc-linux-gnu/lib/
-isystem /eng/upc/dev/gary/gupc-dev/rls/gupc/x86_64-pc-linux-gnu/include -isyst
em /eng/upc/dev/gary/gupc-dev/rls/gupc/x86_64-pc-linux-gnu/sys-include -DHAVE_C
ONFIG_H -I. -I/eng/upc/dev/gary/gupc-dev/src/gupc/libgfortran -iquote/eng/upc/d
ev/gary/gupc-dev/src/gupc/libgfortran/io -I/eng/upc/dev/gary/gupc-dev/src/gupc/
libgfortran/../gcc -I/eng/upc/dev/gary/gupc-dev/src/gupc/libgfortran/../gcc/con
fig -I/eng/upc/dev/gary/gupc-dev/src/gupc/libgfortran/../libquadmath -I../../..
/./gcc -I/eng/upc/dev/gary/gupc-dev/src/gupc/libgfortran/../libgcc -I../../libg
cc -I/eng/upc/dev/gary/gupc-dev/src/gupc/libgfortran/../libbacktrace -I../../li
bbacktrace -I../libbacktrace -std=gnu11 -Wall -Wstrict-prototypes -Wmissing-pro
totypes -Wold-style-definition -Wextra -Wwrite-strings -Werror=implicit-functio
n-declaration -Werror=vla -fcx-fortran-rules -ffunction-sections -fdata-section
s -g3 -O3 -m32 -MT write.lo -MD -MP -MF .deps/write.Tpo -c /eng/upc/dev/gary/gu
pc-dev/src/gupc/libgfortran/io/write.c -o write.o >/dev/null 2>&1
make[6]: *** [write.lo] Error 1
make[6]: Leaving directory `/eng/upc/dev/gary/gupc-dev/bld/gupc/x86_64-pc-linux
-gnu/32/libgfortran'

Above, that make step sends output /dev/null.  Running the same command by
hand, yields:

/eng/upc/dev/gary/gupc-dev/src/gupc/libgfortran/io/write.c: In function
‘write_a’:
/eng/upc/dev/gary/gupc-dev/src/gupc/libgfortran/io/write.c:232:1: error:
invalid PHI argument
 write_a (st_parameter_dt *dtp, const fnode *f, const char *source, int len)
 ^

<<< Unknown tree: <invalid tree code> >>>
/eng/upc/dev/gary/gupc-dev/src/gupc/libgfortran/io/write.c:232:1: internal
compiler error: tree check: expected tree that contains ‘typed’ structure, have
‘<invalid tree code>’ in verify_gimple_phi, at tree-cfg.c:4658
0xe4fbe4 tree_contains_struct_check_failed(tree_node const*,
tree_node_structure_enum, char const*, int, char const*)
        /eng/upc/dev/gary/gupc-dev/src/gupc/gcc/tree.c:9839
0xbf13bc contains_struct_check(tree_node*, tree_node_structure_enum, char
const*, int, char const*)
        /eng/upc/dev/gary/gupc-dev/src/gupc/gcc/tree.h:3173
0xbf13bc verify_gimple_phi
        /eng/upc/dev/gary/gupc-dev/src/gupc/gcc/tree-cfg.c:4658
0xbf13bc verify_gimple_in_cfg(function*, bool)
        /eng/upc/dev/gary/gupc-dev/src/gupc/gcc/tree-cfg.c:4952
0xab36f7 execute_function_todo
        /eng/upc/dev/gary/gupc-dev/src/gupc/gcc/passes.c:1945
0xab4b7a do_per_function
        /eng/upc/dev/gary/gupc-dev/src/gupc/gcc/passes.c:1632
0xab4b7a execute_todo
        /eng/upc/dev/gary/gupc-dev/src/gupc/gcc/passes.c:2000