darwin and pic/dynamic-no-pic

[Andrew Pinski <apinski at apple dot com>]

Since Apple does not provide static libraries and the pic references on
ppc are not done through RTOC and that pic is default on Darwin,
Apple came up with a way to do static (no-pic) like programs called
dynamic-no-pic but it never went into the FSF's gcc for some reason,
I do not know why but it looks stable to me. So I ripped it out and
patched the current mainline of the FSF's gcc (back in October and have
been updating it since) with it and it works.

I have bootstrapped with using the option -mdynamic-no-pic on and off
(Note I cannot bootstrap right now on darwin with c++ enabled,
the regression tester for the mainline just spewed a message at
Tue Mar 4, 2003  20:43:09 US/Pacific, but I have been bootstrapping
with this patch since October).
I cannot run the testsuite because there is a bug in Darwin's kernel
(unless it has been fixed in 6.4).
I have run SPEC 2000 with this patch and -mdynamic-no-pic enabled and
it ran with no miscompares.

Sorry that this patch is big.

Thanks,
Andrew Pinski
apinski at apple dot com

ChangeLog:
2002-11-04  Andrew Pinski  <apinski at apple dot com>
	*  config/darwin.c (machopic_function_base_name):  If dynamic-no-pic is
	on should not get here.	(machopic_indirect_data_reference): If
	dynamic-no-pic is on just generate high/low parts of the address.
	(machopic_legitimize_pic_address): Change MACHOPIC_PURE to
	MACHOPIC_INDIRECT. Dynamic-no-pic uses 0 as the pic
	base. Generate symbol and labels with a new reg.
	Dynamic-no-pic does not have a pic_offset_table_rtx.
	(machopic_select_section): Change references of flag_pic to
	MACHOPIC_INDIRECT. (machopic_asm_out_constructor): Likewise.
	(machopic_asm_out_destructor): Likewise.
	*  config/darwin.h  (ASM_DECLARE_UNRESOLVED_REFERENCE): Change 
reference
	of flag_pic to MACHOPIC_INDIRECT.
	(MACHO_DYNAMIC_NO_PIC_P) Define as TARGET_DYNAMIC_NO_PIC.
	(MACHOPIC_INDIRECT): Is also true when dynamic-no-pic is on.
	(MACHOPIC_JUST_INDIRECT): Is also true when dynamic-no-pic is on.
	(MACHOPIC_PURE): Is not pure when dynamic-no-pic is on.
	*  config/i386/darwin.h (MASK_MACHO_DYNAMIC_NO_PIC): Define as 0 for 
right
	now as dynamic-no-pic is not implemented on Darwin/ia32.
	*  config/rs6000/darwin.h  (MASK_MACHO_DYNAMIC_NO_PIC): Define.
	(TARGET_DYNAMIC_NO_PIC): Define. (TARGET_DYNAMIC_NO_PIC): Define as 
(target_flags &
	MASK_MACHO_DYNAMIC_NO_PIC)(SUBTARGET_SWITCHES): Define,	have 
sub-target switches for
	dynamic-no-pic. (SUBTARGET_OVERRIDE_OPTIONS): Move check for -fpic from
	rs6000_override_options to here. Dynamic-no-pic overrides 
pic.(CC1_SPEC): Change
	from not static then pic to not static and not dynamic-no-pic then pic.
	*  config/rs6000/rs6000.c  (rs6000_override_options): Move the check 
for
	-fpic and DARWIN_ABI to config/rs6000/darwin.h 
(rs6000_legiitimize_reload_address):
	Add case for loading floating in dynamic-no-pic. (rs6000_emit_move): 
Add case for dynamic-no-pic.
	(rs6000_emit_move): Change reference of flag_pic to MACHOPIC_INDIRECT.
	(secondary_reload_class): Conditional change the reference of flag_pic 
to MACHOPIC_INDIRECT.
	(rs6000_output_mi_thunk): Change reference of flag_pic to 
MACHOPIC_INDIRECT.
	(output_profile_hook): Likewise. (machopic_output_stub): Non-pure 
(dynamic-no-pic) is now supported.
	*  config/rs6000/rs6000.md  (movdf_low): Add the case for 
MACHO_DYNAMIC_NO_PIC_P.
	(call): Change references for flag_pic in TARGET_MACHO to 
MACHOPIC_INDIRECT.
	(SUBTARGET_OVERRIDE_OPTIONS): Add case where -fpic is on and 
-mdynamic-no-pic is on.
	also the moved case for -fpic from rs6000.c
	*  doc/invoke.texi (dynamic-no-pic): Document.

Patch:

Attachment: dynamic-no-pic.nochanges.patch
Description: Binary data