[Bug target/12624] Gcc failed to bootstrap on ia64

["wilson at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12624



------- Additional Comments From wilson at gcc dot gnu dot org  2003-10-23 06:01 -------
Here is a minimal testcase.

register int foo __asm__ ("r13");

If you compile this with g++ at -O2 you get an ICE.  This is trivial to
reproduce with a cross compiler to ia64-linux.

The path to here is
  cp_finish_decl
  make_rtl_for_nonlocal_decl
  rest_of_decl_compilation
  cgraph_varpool_finalize_decl
  cgraph_varpool_mark_needed_node
  notice_global_symbol
and it dies in the last one because it assumes DECL_RTL contains a SYMBOL_REF.

It seems simple enough to change notice_global_symbol to test for a SYMBOL_REF
instead of assuming it.  A global register variable doesn't seem to be of any
use here.

The same testcase doesn't fail with the C compiler though.  This is because the
C front end sets DECL_DEFER_OUTPUT, but the C++ front end does not.  This causes
us to not call cgraph_varpool_finalize_decl when compiled as C code.