Add LTO support

The patch reuses the configuration for LTO from ix86 and adds the
aarch64 architecture to the list of supported COFF headers.

gcc/ChangeLog:

	* config/aarch64/cygming.h (TARGET_ASM_LTO_START): New.
	(TARGET_ASM_LTO_END): Likewise.
	* config/i386/cygming.h (TARGET_ASM_LTO_START): Update.
	(TARGET_ASM_LTO_END): Likewise.
	* config/i386/i386-protos.h (i386_pe_asm_lto_start): Delete.
	(i386_pe_asm_lto_end): Likewise.
	* config/mingw/winnt.cc (i386_pe_asm_lto_start): Rename
	into ...
	(mingw_pe_asm_lto_start): ... this.
	(i386_pe_asm_lto_end): Rename into ...
	(mingw_pe_asm_lto_end): ... this.
	* config/mingw/winnt.h (mingw_pe_asm_lto_start): New.
	(mingw_pe_asm_lto_end): Likewise.

libiberty/ChangeLog:

	* simple-object-coff.c: Add aarch64.

6 files changed, 15 insertions, 7 deletions

diff --git a/gcc/config/aarch64/cygming.h b/gcc/config/aarch64/cygming.h
index 3afeb77..8b9038c 100644
--- a/gcc/config/aarch64/cygming.h
+++ b/gcc/config/aarch64/cygming.h
@@ -245,4 +245,10 @@ still needed for compilation.  */
 
 #define HAVE_64BIT_POINTERS 1
 
+/* Kludge because of missing PE-COFF support for early LTO debug.  */
+#undef  TARGET_ASM_LTO_START
+#define TARGET_ASM_LTO_START mingw_pe_asm_lto_start
+#undef  TARGET_ASM_LTO_END
+#define TARGET_ASM_LTO_END mingw_pe_asm_lto_end
+
 #endif
diff --git a/gcc/config/i386/cygming.h b/gcc/config/i386/cygming.h
index 7852af6..7a97d02 100644
--- a/gcc/config/i386/cygming.h
+++ b/gcc/config/i386/cygming.h
@@ -348,9 +348,9 @@ do {						\
 
 /* Kludge because of missing PE-COFF support for early LTO debug.  */
 #undef  TARGET_ASM_LTO_START
-#define TARGET_ASM_LTO_START i386_pe_asm_lto_start
+#define TARGET_ASM_LTO_START mingw_pe_asm_lto_start
 #undef  TARGET_ASM_LTO_END
-#define TARGET_ASM_LTO_END i386_pe_asm_lto_end
+#define TARGET_ASM_LTO_END mingw_pe_asm_lto_end
 
 #undef ASM_COMMENT_START
 #define ASM_COMMENT_START " #"
diff --git a/gcc/config/i386/i386-protos.h b/gcc/config/i386/i386-protos.h
index c26ae5e..78e72c5 100644
--- a/gcc/config/i386/i386-protos.h
+++ b/gcc/config/i386/i386-protos.h
@@ -320,8 +320,6 @@ extern void i386_pe_asm_output_aligned_decl_common (FILE *, tree,
 						    const char *,
 						    HOST_WIDE_INT,
 						    HOST_WIDE_INT);
-extern void i386_pe_asm_lto_start (void);
-extern void i386_pe_asm_lto_end (void);
 extern void i386_pe_start_function (FILE *, const char *, tree);
 extern void i386_pe_end_function (FILE *, const char *, tree);
 extern void i386_pe_end_cold_function (FILE *, const char *, tree);
diff --git a/gcc/config/mingw/winnt.cc b/gcc/config/mingw/winnt.cc
index 59d4a6e..5690492 100644
--- a/gcc/config/mingw/winnt.cc
+++ b/gcc/config/mingw/winnt.cc
@@ -832,14 +832,14 @@ mingw_pe_file_end (void)
 static enum debug_info_levels saved_debug_info_level;
 
 void
-i386_pe_asm_lto_start (void)
+mingw_pe_asm_lto_start (void)
 {
   saved_debug_info_level = debug_info_level;
   debug_info_level = DINFO_LEVEL_NONE;
 }
 
 void
-i386_pe_asm_lto_end (void)
+mingw_pe_asm_lto_end (void)
 {
   debug_info_level = saved_debug_info_level;
 }
diff --git a/gcc/config/mingw/winnt.h b/gcc/config/mingw/winnt.h
index 14bff19..1ac19fd 100644
--- a/gcc/config/mingw/winnt.h
+++ b/gcc/config/mingw/winnt.h
@@ -23,6 +23,8 @@ http://www.gnu.org/licenses/.  */
 extern tree mingw_handle_selectany_attribute (tree *, tree, tree, int, bool *);
 
 extern void mingw_pe_asm_named_section (const char *, unsigned int, tree);
+extern void mingw_pe_asm_lto_start (void);
+extern void mingw_pe_asm_lto_end (void);
 extern void mingw_pe_declare_type (FILE *, const char *, bool, bool);
 extern void mingw_pe_encode_section_info (tree, rtx, int);
 extern void mingw_pe_file_end (void);
diff --git a/libiberty/simple-object-coff.c b/libiberty/simple-object-coff.c
index e748205..fd3c310 100644
--- a/libiberty/simple-object-coff.c
+++ b/libiberty/simple-object-coff.c
@@ -219,7 +219,9 @@ static const struct coff_magic_struct coff_magic[] =
   /* i386.  */
   { 0x14c, 0, F_EXEC | IMAGE_FILE_SYSTEM | IMAGE_FILE_DLL },
   /* x86_64.  */
-  { 0x8664, 0, F_EXEC | IMAGE_FILE_SYSTEM | IMAGE_FILE_DLL }
+  { 0x8664, 0, F_EXEC | IMAGE_FILE_SYSTEM | IMAGE_FILE_DLL },
+  /* AArch64.  */
+  { 0xaa64, 0, F_EXEC | IMAGE_FILE_SYSTEM | IMAGE_FILE_DLL }
 };
 
 /* See if we have a COFF file.  */