Re: ICE on bootstrap of libstdc++ for mingw-targets in add_bb_to_loop

[Richard Guenther <richard dot guenther at gmail dot com>]

On Tue, Apr 10, 2012 at 12:41 PM, Kai Tietz <ktietz70@googlemail.com> wrote:
> Hello,
>
> recent changes to cfgloop have caused an ICE on bootstrapping
> libstdc++ for mingw targets. ?I assume same ICE happens for cygwin
> hosted gcc bootstrap, too. ICE happens on compiling of
> gcc/libstdc++-v3/libsupc++/eh_alloc.cc
>
> Code which produces seg-fault is in macro:
>
> ? ? ?DEF_VEC_P (loop_p);
>
> backtrace:
>
> #0 ?add_bb_to_loop (bb=0x7ef68ca0, loop=0x0) at ../../gcc/gcc/cfgloop.h:88

loop is NULL, so the issue is that mingw somewhere generates a basic-block
without a loop father.

> #1 ?0x00a5e3d7 in split_block (bb=0x7ef68bc8, i=0x7eb6ea30)

for this block (bb).

Find out where it is generated and fix that.

Richard.

> ? ?at ../../gcc/gcc/cfghooks.c:450
> #2 ?0x00abaf49 in find_many_sub_basic_blocks (blocks=0x442f178)
> ? ?at ../../gcc/gcc/cfgbuild.c:474
> #3 ?0x008a280f in break_superblocks () at ../../gcc/gcc/cfglayout.c:1345
> #4 ?0x007293f9 in finish_eh_generation () at ../../gcc/gcc/except.c:1431
> #5 ?0x00dc06f4 in gimple_expand_cfg () at ../../gcc/gcc/cfgexpand.c:4652
> #6 ?0x008d4afc in execute_one_pass (pass=0x1143bc0)
> ? ?at ../../gcc/gcc/passes.c:2079
> #7 ?0x008d4cc4 in execute_pass_list (pass=0x4350238)
> ? ?at ../../gcc/gcc/passes.c:2134
> #8 ?0x00a8b1c4 in tree_rest_of_compilation (fndecl=0x7eca1d00)
> ? ?at ../../gcc/gcc/tree-optimize.c:422
> #9 ?0x008da273 in cgraph_expand_function (node=0x7ecd7578)
> ? ?at ../../gcc/gcc/cgraphunit.c:1784
> #10 0x008dc2d9 in cgraph_optimize () at ../../gcc/gcc/cgraphunit.c:1851
> #11 0x008dcb2e in cgraph_finalize_compilation_unit ()
> ? ?at ../../gcc/gcc/cgraphunit.c:2628
> #12 0x00510c5b in cp_write_global_declarations ()
> ? ?at ../../gcc/gcc/cp/decl2.c:4077
> #13 0x008e6452 in toplev_main (argc=30, argv=0x43497d0)
> ? ?at ../../gcc/gcc/toplev.c:572
> #14 0x006a104a in main (argc=30, argv=0x43497d0) at ../../gcc/gcc/main.c:36