Sync libiberty with upstream GCC.

include/ChangeLog
	* libiberty.h (PEX_STDOUT_APPEND): New flag.
	(PEX_STDERR_APPEND): Likewise.

	* demangle.h (DMGL_DLANG): New macro.
	(DMGL_STYLE_MASK): Add DMGL_DLANG.
	(demangling_styles): Add dlang_demangling.
	(DLANG_DEMANGLING_STYLE_STRING): New macro.
	(DLANG_DEMANGLING): New macro.
	(dlang_demangle): New prototype.

	* longlong.h: Add __udiv_w_sdiv prototype.

libiberty/ChangeLog
	* cp-demangle.c (d_substitution): Handle abi tags on abbreviation.

	* pex-common.h (struct pex_funcs): Add new parameter for open_write field.
	* pex-unix.c (pex_unix_open_write): Add support for new parameter.
	* pex-djgpp.c (pex_djgpp_open_write): Likewise.
	* pex-win32.c (pex_win32_open_write): Likewise.
	* pex-common.c (pex_run_in_environment): Likewise.

	* Makefile.in (CFILES): Add d-demangle.c.
	(REQUIRED_OFILES): Add d-demangle.o.
	* cplus-dem.c (libiberty_demanglers): Add dlang_demangling case.
	(cplus_demangle): Likewise.
	* d-demangle.c: New file.
	* testsuite/Makefile.in (really-check): Add check-d-demangle.
	* testsuite/d-demangle-expected: New file.

	* simple-object-elf.c (simple_object_elf_write_ehdr): Correctly
	handle objects with more than SHN_LORESERVE sections.
	(simple_object_elf_write_shdr): Add sh_link parameter.
	(simple_object_elf_write_to_file): Correctly handle objects with
	more than SHN_LORESERVE sections.

	* cp-demangle.c (d_dump): Only access field from s_fixed part of
	the union for DEMANGLE_COMPONENT_FIXED_TYPE.
	(d_count_templates_scopes): Likewise.

	* testsuite/demangler-fuzzer.c: New file.
	* testsuite/Makefile.in (fuzz-demangler): New rule.
	(demangler-fuzzer): Likewise.
	(mostlyclean): Clean up demangler fuzzer.

libiberty/simple-object-elf.c

@@ -698,6 +698,7 @@ simple_object_elf_write_ehdr (simple_object_write *sobj, int descriptor,
   unsigned char buf[sizeof (Elf64_External_Ehdr)];
   simple_object_write_section *section;
   unsigned int shnum;
+  unsigned int shstrndx;
 
   fns = attrs->type_functions;
   cl = attrs->ei_class;
@@ -743,9 +744,17 @@ simple_object_elf_write_ehdr (simple_object_write *sobj, int descriptor,
 		 (cl == ELFCLASS32
 		  ? sizeof (Elf32_External_Shdr)
 		  : sizeof (Elf64_External_Shdr)));
-  ELF_SET_FIELD (fns, cl, Ehdr, buf, e_shnum, Elf_Half, shnum);
-  ELF_SET_FIELD (fns, cl, Ehdr, buf, e_shstrndx, Elf_Half,
-		 shnum == 0 ? 0 : shnum - 1);
+  ELF_SET_FIELD (fns, cl, Ehdr, buf, e_shnum, Elf_Half,
+		 shnum >= SHN_LORESERVE ? 0 : shnum);
+  if (shnum == 0)
+    shstrndx = 0;
+  else
+    {
+      shstrndx = shnum - 1;
+      if (shstrndx >= SHN_LORESERVE)
+	shstrndx = SHN_XINDEX;
+    }
+  ELF_SET_FIELD (fns, cl, Ehdr, buf, e_shstrndx, Elf_Half, shstrndx);
 
   return simple_object_internal_write (descriptor, 0, buf, ehdr_size,
 				       errmsg, err);
@@ -758,8 +767,8 @@ simple_object_elf_write_shdr (simple_object_write *sobj, int descriptor,
 			      off_t offset, unsigned int sh_name,
 			      unsigned int sh_type, unsigned int sh_flags,
 			      unsigned int sh_offset, unsigned int sh_size,
-			      unsigned int sh_addralign, const char **errmsg,
-			      int *err)
+			      unsigned int sh_link, unsigned int sh_addralign,
+			      const char **errmsg, int *err)
 {
   struct simple_object_elf_attributes *attrs =
     (struct simple_object_elf_attributes *) sobj->data;
@@ -781,7 +790,7 @@ simple_object_elf_write_shdr (simple_object_write *sobj, int descriptor,
   ELF_SET_FIELD (fns, cl, Shdr, buf, sh_flags, Elf_Addr, sh_flags);
   ELF_SET_FIELD (fns, cl, Shdr, buf, sh_offset, Elf_Addr, sh_offset);
   ELF_SET_FIELD (fns, cl, Shdr, buf, sh_size, Elf_Addr, sh_size);
-  /* sh_link left as zero.  */
+  ELF_SET_FIELD (fns, cl, Shdr, buf, sh_link, Elf_Word, sh_link);
   /* sh_info left as zero.  */
   ELF_SET_FIELD (fns, cl, Shdr, buf, sh_addralign, Elf_Addr, sh_addralign);
   /* sh_entsize left as zero.  */
@@ -812,6 +821,8 @@ simple_object_elf_write_to_file (simple_object_write *sobj, int descriptor,
   unsigned int shnum;
   size_t shdr_offset;
   size_t sh_offset;
+  unsigned int first_sh_size;
+  unsigned int first_sh_link;
   size_t sh_name;
   unsigned char zero;
 
@@ -842,8 +853,17 @@ simple_object_elf_write_to_file (simple_object_write *sobj, int descriptor,
   shdr_offset = ehdr_size;
   sh_offset = shdr_offset + shnum * shdr_size;
 
+  if (shnum < SHN_LORESERVE)
+    first_sh_size = 0;
+  else
+    first_sh_size = shnum;
+  if (shnum - 1 < SHN_LORESERVE)
+    first_sh_link = 0;
+  else
+    first_sh_link = shnum - 1;
   if (!simple_object_elf_write_shdr (sobj, descriptor, shdr_offset,
-				     0, 0, 0, 0, 0, 0, &errmsg, err))
+				     0, 0, 0, 0, first_sh_size, first_sh_link,
+				     0, &errmsg, err))
     return errmsg;
 
   shdr_offset += shdr_size;
@@ -887,7 +907,7 @@ simple_object_elf_write_to_file (simple_object_write *sobj, int descriptor,
 
       if (!simple_object_elf_write_shdr (sobj, descriptor, shdr_offset,
 					 sh_name, SHT_PROGBITS, 0, sh_offset,
-					 sh_size, 1U << section->align,
+					 sh_size, 0, 1U << section->align,
 					 &errmsg, err))
 	return errmsg;
 
@@ -898,7 +918,7 @@ simple_object_elf_write_to_file (simple_object_write *sobj, int descriptor,
 
   if (!simple_object_elf_write_shdr (sobj, descriptor, shdr_offset,
 				     sh_name, SHT_STRTAB, 0, sh_offset,
-				     sh_name + strlen (".shstrtab") + 1,
+				     sh_name + strlen (".shstrtab") + 1, 0,
 				     1, &errmsg, err))
     return errmsg;