Enabled linkonce support for Darwin.

	* target.h (struct gcc_target): New target hook, unwind_label.
	* target-def.h (TARGET_ASM_EMIT_UNWIND_LABEL): New hook.
	* output.h (default_emit_unwind_label): New function.
	* default.h (TARGET_EXPLICIT_INSTANTIATIONS_ONE_ONLY): New macro.
	(TARGET_USES_WEAK_UNWIND_INFO): New target macro.
	(TARGET_SUPPORTS_HIDDEN): New target macro.
	* dwarf2out.c (struct dw_fde_struct): Add field for function decl
	that corresponds to this FDE.
	(FRAME_BEGIN_LABEL): Allow target to override default label.
	(output_call_frame_info): If FDEs are linknonce, then use extra
	indirection for FDE encoding, output a label for each FDE, and
	output an empty label for each function without an FDE.
	(dwarf2out_begin_prologue): Set up decl field when creating an FDE.
	* varasm.c (globalize_decl): Call ASM_MAKE_LABEL_LINKONCE for
	decls with DECL_ONE_ONLY set, if that macro is defined.
	(make_decl_one_only): Don't use DECL_COMMON if we're compiling
	for a SUPPORTS_ONE_ONLY target.
	* config/darwin-protos.h (darwin_unique_section): Declare.
	(darwin_asm_named_section): Likewise.
	(darwin_section_type_flags): Likewise.
	(darwin_non_lazy_pcrel): Likewise.
	(darwin_emit_unwind_label): Likewise.
	(darwin_make_decl_one_only): Likewise.
	* config/darwin.c (machopic_finish): Get rid of tweak that
	eliminate stubs for symbols that are defined.
	(darwin_encode_section_info): Don't treat weak functions as defined.
	(darwin_make_decl_one_only): Define.
	(darwin_asm_named_section): Likewise.
	(darwin_section_type_flags): Likewise.
	(darwin_unique_section): Likewise.
	(darwin_emit_unwind_label): Likewise.
	(darwin_non_lazy_pcrel): Likewise.
	(darwin_asm_output_dwarf_delta): Difference between two labels is
	local only if both labels are local.
	* config/darwin.h (MAKE_DECL_ONE_ONLY): Define.
	(ASM_MAKE_LABEL_LINKONCE): Likewise.
	(TARGET_SUPPORTS_HIDDEN): Likewise.
	(TARGET_USES_WEAK_UNWIND_INFO): Likewise.
	(TARGET_EXPLICIT_INSTANTIATIONS_ONE_ONLY): Likewise.
	(FRAME_BEGIN_LABEL): Likewise.
	(ASM_DECLARE_OBJECT_NAME): Make references to weak symbols indirect.
	(ASM_DECLARE_FUNCTION_NAME): Likewise.
	(darwin_eh_frame_section): Give __eh_frame section the coalesced flag.
	(TARGET_ASM_UNIQUE_SECTION): Define.
	(EH_FRAME_SECTION_NAME): Define.
	(EH_FRAME_SECTION_ATTR): Likewise.
	(ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX): Likewise.
	(TARGET_ASM_NAMED_SECTION): Likewise.
	(TARGET_SECTION_TYPE_FLAGS): Likewise.
	* doc/tm.texi: Document TARGET_USES_WEAK_UNWIND_INFO,
	TARGET_EXPLICIT_INSTANTIATIONS_ONE_ONLY, TARGET_SUPPORTS_HIDDEN,
	TARGET_ASM_EMIT_UNWIND_LABEL.

	* cp/decl2.c (maybe_make_one_only): Look at
	TARGET_EXPLICIT_INSTANTIATION_ONE_ONLY when deciding whether
	to make an explicit instantiation weak.
	* cp/method.c (use_thunk): Make sure we call comdat_linkage
	when appropriate.
	* cp/pt.c (do_type_instantiation): On systems where weak symbols
	don't go in a static archive's TOC, explicit instantiation of a
	class must imply *explicit* instantiation of its memeber.

From-SVN: r79394

2 files changed, 13 insertions, 11 deletions

diff --git a/libffi/src/powerpc/darwin.S b/libffi/src/powerpc/darwin.S
index 70c48e531d9..ad4824e2762 100644
--- a/libffi/src/powerpc/darwin.S
+++ b/libffi/src/powerpc/darwin.S
@@ -162,8 +162,8 @@ _ffi_call_AIX:
 /* END(_ffi_call_AIX)  */
 
 .data
-.section __TEXT,__eh_frame
-Lframe1:
+.section __TEXT,__eh_frame,coalesced,no_toc+strip_static_syms
+EH_frame1:
 	.set	L$set$0,LECIE1-LSCIE1
 	.long	L$set$0	; Length of Common Information Entry
 LSCIE1:
@@ -173,19 +173,20 @@ LSCIE1:
 	.byte	0x1	; uleb128 0x1; CIE Code Alignment Factor
 	.byte	0x7c	; sleb128 -4; CIE Data Alignment Factor
 	.byte	0x41	; CIE RA Column
-	.byte   0x1     ; uleb128 0x1; Augmentation size
-	.byte   0x10    ; FDE Encoding (pcrel)
+	.byte	0x1	; uleb128 0x1; Augmentation size
+	.byte	0x90	; FDE Encoding (indirect pcrel)
 	.byte	0xc	; DW_CFA_def_cfa
 	.byte	0x1	; uleb128 0x1
 	.byte	0x0	; uleb128 0x0
 	.align	2
 LECIE1:
+.globl _ffi_call_DARWIN.eh
+_ffi_call_DARWIN.eh:
 LSFDE1:
 	.set	L$set$1,LEFDE1-LASFDE1
 	.long	L$set$1	; FDE Length
 LASFDE1:
-	.set	L$set$2,LASFDE1-Lframe1
-	.long	L$set$2	; FDE CIE offset
+	.long	LASFDE1-EH_frame1 ; FDE CIE offset
 	.long	LFB0-.	; FDE initial location
 	.set	L$set$3,LFE1-LFB0
 	.long	L$set$3	; FDE address range
diff --git a/libffi/src/powerpc/darwin_closure.S b/libffi/src/powerpc/darwin_closure.S
index d8612a85445..13ee81d6049 100644
--- a/libffi/src/powerpc/darwin_closure.S
+++ b/libffi/src/powerpc/darwin_closure.S
@@ -234,8 +234,8 @@ Lfinish:
 /* END(ffi_closure_ASM)  */
 
 .data
-.section __TEXT,__eh_frame
-Lframe1:
+.section __TEXT,__eh_frame,coalesced,no_toc+strip_static_syms
+EH_frame1:
 	.set	L$set$0,LECIE1-LSCIE1
 	.long	L$set$0	; Length of Common Information Entry
 LSCIE1:
@@ -246,19 +246,20 @@ LSCIE1:
 	.byte	0x7c	; sleb128 -4; CIE Data Alignment Factor
 	.byte	0x41	; CIE RA Column
 	.byte	0x1	; uleb128 0x1; Augmentation size
-	.byte	0x10	; FDE Encoding (pcrel)
+	.byte	0x90	; FDE Encoding (indirect pcrel)
 	.byte	0xc	; DW_CFA_def_cfa
 	.byte	0x1	; uleb128 0x1
 	.byte	0x0	; uleb128 0x0
 	.align	2
 LECIE1:
+.globl _ffi_closure_ASM.eh
+_ffi_closure_ASM.eh:
 LSFDE1:
 	.set	L$set$1,LEFDE1-LASFDE1
 	.long	L$set$1	; FDE Length
 
 LASFDE1:
-	.set	L$set$2,LASFDE1-Lframe1
-	.long	L$set$2	; FDE CIE offset
+	.long	LASFDE1-EH_frame1	; FDE CIE offset
 	.long	LFB1-.	; FDE initial location
 	.set	L$set$3,LFE1-LFB1
 	.long	L$set$3	; FDE address range