https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98228
--- Comment #9 from Marius Hillenbrand <mhillen at linux dot ibm.com> ---
The failures in gnat1 during bootstrap have not led me anywhere, yet I found
useful ICEs while running the test suite on the mostly-bootstrapped tree. The
failing code in gnat appears compiled correctly, and I am not familiar enough
with Ada to dig deeper (e.g., the segfault results from overrunning the last
element of All_Interp.Table, which looks "correct" locally but maybe is the
result of a corruption of that table earlier).
The ICE when building gcc/testsuite/gcc.target/s390/target-attribute/tattr-3.c
is caused by a wrongly resolved struct offset for
lang_hooks.types.type_promotes_to() in s390-c.c:s390_fn_types_compatible()
in
if (lang_hooks.types_compatible_p (
lang_hooks.types.type_promotes_to (in_type),
lang_hooks.types.type_promotes_to (b_arg_type))) ...
the calls to type_promotes_to() actually call lang_hooks.types.generic_p (two
entries, 0x10, earlier in that struct), which returns 0. c_types_compatible_p
expects non-null arguments and then segfaults.
Program received signal SIGSEGV, Segmentation fault.
c_types_compatible_p (x=0x0, x@entry=<error reading variable: value has been
optimized out>, y=0x0)
at ../../gcc/c/c-objc-common.c:377
377 return comptypes (TYPE_MAIN_VARIANT (x), TYPE_MAIN_VARIANT (y));
(gdb) bt
#0 c_types_compatible_p (x=0x0, x@entry=<error reading variable: value has
been optimized out>, y=0x0)
at ../../gcc/c/c-objc-common.c:377
#1 0x00000000012f72fe in s390_fn_types_compatible (arglist=<optimized out>,
typeindex=<optimized out>)
at ../../gcc/config/s390/s390-c.c:773
#2 s390_resolve_overloaded_builtin (loc=<optimized out>,
ob_fndecl=0x3fffb3ac400, passed_arglist=0x3fffb3f26b8)
at ../../gcc/config/s390/s390-c.c:951
...
the stage2 cc1 uses the correct offset yet then miscompiles the stage3 cc1
gcc/config/s390/s390-c.c:773
if (lang_hooks.types_compatible_p (
12f72d2: c4 18 00 b3 97 4f lgrl %r1,296a170 <lang_hooks+0x258>
offset should be +0x268
12f72d8: c4 88 00 b3 96 a0 lgrl %r8,296a018 <lang_hooks+0x100>
12f72de: b9 04 00 2a lgr %r2,%r10
12f72e2: 0d e1 basr %r14,%r1
...
