[Bug rtl-optimization/52139] [4.5 Regression] ICE: in remove_insn, at emit-rtl.c:3960 with -O -fPIC -fno-tree-dominator-opts -fno-tree-fre

[steven at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52139

--- Comment #11 from Steven Bosscher <steven at gcc dot gnu.org> 2013-04-11 19:26:09 UTC ---
The proper fix is to simply prepend BB_HEADER_(b) to BB_FOOTER(b).  The
reason for linking BB_HEADER to BB_END(a) is that there used to be line
notes there:

  /* Possible line number notes should appear in between.  */

But that's ancient history.

On top of that, anything in BB_FOOTER(b) should *never* end up in the
insns chain, by definition of cfglayout's footers.