Fix PR target/10567

[Eric Botcazou]

The SPARC back-end doesn't honor the -f{no-}delayed-branch flag.  The fix 
should have been minimal after the recent cleanup work, but it turned out it 
is not because of the C++ thunk support that requires a sibcall, which is 
not trivial to generate without using delay slots on SPARC.

David is of the opinion the patch should go in anyway, so I commited this 
revised version to mainline.  Bootstrapped/regtested (C, C++, ObjC) on 
sparc64-sun-solaris2.9 and sparc-sun-solaris2.8, with and without:

BOOT_CFLAGS="-g -O2 -fno-delayed-branch" CXXFLAGS="-g -O2 
-fno-delayed-branch"

[It appears that LIBCXXFLAGS doesn't have any affect on the flags used for 
building libstdc++-v3 on mainline].


2004-07-07  Eric Botcazou  <ebotcazou@libertysurf.fr>

	PR target/10567
	* config/sparc/sparc.c (load_pic_register): Honor flag_delayed_branch.
	(output_return): Likewise.
	(output_sibcall): Abort if !flag_delayed_branch.
	(sparc_function_ok_for_sibcall): Return 0 if !flag_delayed_branch.
	(emit_and_preserve): New function.
	(sparc_output_mi_thunk): Use it.  Honor flag_delayed_branch.  Emit an
	indirect jump to the thunked-to function if !flag_delayed_branch.
	* config/sparc/sparc.md (delayed_branch): New attribute.
	(load_pcrel_sym): Honor flag_delayed_branch.  Use above
	attribute to compute the length of the insn.
	(goto_handler_and_restore): Likewise.


-- 
Eric Botcazou
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