[Bug target/87285] New: [9 Regression] ICE: SIGSEGV in tree_class_check (tree.h:3235) with -O2 -std=gnu++11

[zsojka at seznam dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87285

            Bug ID: 87285
           Summary: [9 Regression] ICE: SIGSEGV in tree_class_check
                    (tree.h:3235) with -O2 -std=gnu++11
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: mipsel-unknown-linux-gnu
             Build: x86_64-pc-linux-gnu

Created attachment 44680
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44680&action=edit
reduced testcase (from compatibility-c++0x.cc)

Compiler output:
$ cc1plus -O2 -std=gnu++11 testcase.C 
 virtual a b::c() const constexpr b::b(b&&) constexpr b::b(b&&) constexpr
b::b(b&&)
Analyzing compilation unit
Performing interprocedural optimizations
 <*free_lang_data> <visibility> <build_ssa_passes> <opt_local_passes>during
GIMPLE pass: fnsplit

testcase.C: In function 'virtual a b::c() const':
testcase.C:13:1: internal compiler error: Segmentation fault
13 | }
   | ^
0xe0747f crash_signal
        /repo/gcc-trunk/gcc/toplev.c:325
0x10c9acc tree_class_check(tree_node*, tree_code_class, char const*, int, char
const*)
        /repo/gcc-trunk/gcc/tree.h:3235
0x10c9acc decl_function_context(tree_node const*)
        /repo/gcc-trunk/gcc/tree.c:8994
0x116d247 mips_get_compress_mode
        /repo/gcc-trunk/gcc/config/mips/mips.c:1355
0x116e388 mips_set_current_function
        /repo/gcc-trunk/gcc/config/mips/mips.c:19636
0xa9939b invoke_set_current_function_hook
        /repo/gcc-trunk/gcc/function.c:4616
0xaa392b invoke_set_current_function_hook
        /repo/gcc-trunk/gcc/function.c:4600
0xaa392b allocate_struct_function(tree_node*, bool)
        /repo/gcc-trunk/gcc/function.c:4729
0xe9c6af initialize_cfun
        /repo/gcc-trunk/gcc/tree-inline.c:2452
0xe9c6af tree_function_versioning(tree_node*, tree_node*, vec<ipa_replace_map*,
va_gc, vl_embed>*, bool, bitmap_head*, bool, bitmap_head*, basic_block_def*)
        /repo/gcc-trunk/gcc/tree-inline.c:5832
0x937b3a cgraph_node::create_version_clone_with_body(vec<cgraph_edge*, va_heap,
vl_ptr>, vec<ipa_replace_map*, va_gc, vl_embed>*, bitmap_head*, bool,
bitmap_head*, basic_block_def*, char const*)
        /repo/gcc-trunk/gcc/cgraphclones.c:983
0x1598d0d split_function
        /repo/gcc-trunk/gcc/ipa-split.c:1327
0x159cea8 execute_split_functions
        /repo/gcc-trunk/gcc/ipa-split.c:1825
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.

I am failing to finish build due to this ICE.

$ xgcc -v
Using built-in specs.
COLLECT_GCC=/repo/build-trunk-264226-checking-yes-rtl-df-extra-mipsel/gcc/xgcc
Target: mipsel-unknown-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--with-cloog --with-ppl --with-isl --with-sysroot=/usr/mipsel-unknown-linux-gnu
--build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu
--target=mipsel-unknown-linux-gnu
--with-ld=/usr/bin/mipsel-unknown-linux-gnu-ld
--with-as=/usr/bin/mipsel-unknown-linux-gnu-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-264226-checking-yes-rtl-df-extra-mipsel
Thread model: posix
gcc version 9.0.0 20180912 (experimental) (GCC)