Update libiberty sources with changes in the gcc mainline.

+2020-01-01  Jakub Jelinek  <jakub@redhat.com>
+
+	Update copyright years.
+
+2019-12-06  Tim Ruehsen  <tim.ruehsen@gmx.de>
+
+	* make-relative-prefix.c (split_directories):
+	Return early on empty 'name'
+
+2019-11-16  Tim Ruehsen  <tim.ruehsen@gmx.de>
+
+	* cp-demangle.c (d_print_init): Remove const from 4th param.
+	(cplus_demangle_fill_name): Initialize d->d_counting.
+	(cplus_demangle_fill_extended_operator): Likewise.
+	(cplus_demangle_fill_ctor): Likewise.
+	(cplus_demangle_fill_dtor): Likewise.
+	(d_make_empty): Likewise.
+	(d_count_templates_scopes): Remobe const from 3rd param,
+	Return on dc->d_counting > 1,
+	Increment dc->d_counting.
+        * cp-demint.c (cplus_demangle_fill_component): Initialize d->d_counting.
+	(cplus_demangle_fill_builtin_type): Likewise.
+	(cplus_demangle_fill_operator): Likewise.
+
+2019-11-16  Eduard-Mihai Burtescu  <eddyb@lyken.rs>
+
+	* cplus-dem.c (cplus_demangle): Use rust_demangle directly.
+	(rust_demangle): Remove.
+	* rust-demangle.c (is_prefixed_hash): Rename to is_legacy_prefixed_hash.
+	(parse_lower_hex_nibble): Rename to decode_lower_hex_nibble.
+	(parse_legacy_escape): Rename to decode_legacy_escape.
+	(rust_is_mangled): Remove.
+	(struct rust_demangler): Add.
+	(peek): Add.
+	(next): Add.
+	(struct rust_mangled_ident): Add.
+	(parse_ident): Add.
+	(rust_demangle_sym): Remove.
+	(print_str): Add.
+	(PRINT): Add.
+	(print_ident): Add.
+	(rust_demangle_callback): Add.
+	(struct str_buf): Add.
+	(str_buf_reserve): Add.
+	(str_buf_append): Add.
+	(str_buf_demangle_callback): Add.
+	(rust_demangle): Add.
+	* rust-demangle.h: Remove.
+
+2019-11-15  Miguel Saldivar  <saldivarcher@gmail.com>
+
+	* testsuite/demangle-expected: Fix test.
+
+2019-11-04  Kamlesh Kumar  <kamleshbhalui@gmail.com>
+
+	* cp-demangle.c (d_expr_primary): Handle
+	nullptr demangling.
+	* testsuite/demangle-expected: Added test.
+
+2019-10-29 Paul Pluzhnikov  <ppluzhnikov@google.com>
+
+	* cp-demangle.c (d_number): Avoid signed int overflow.
+
+2019-10-28  Miguel Saldivar  <saldivarcher@gmail.com>
+
+	* cp-demangle.c (d_print_mod): Add a space before printing `complex`
+	and `imaginary`, as opposed to after.
+	* testsuite/demangle-expected: Adjust test.
+
+2019-10-03  Eduard-Mihai Burtescu  <eddyb@lyken.rs>
+
+	* rust-demangle.c (looks_like_rust): Remove.
+	(rust_is_mangled): Don't check escapes.
+	(is_prefixed_hash): Allow 0-9a-f permutations.
+	(rust_demangle_sym): Don't bail on unknown escapes.
+	* testsuite/rust-demangle-expected: Update 'main::$99$' test.
+
+2019-09-03  Eduard-Mihai Burtescu  <eddyb@lyken.rs>
+
+	* rust-demangle.c (unescape): Remove.
+	(parse_lower_hex_nibble): New function.
+	(parse_legacy_escape): New function.
+	(is_prefixed_hash): Use parse_lower_hex_nibble.
+	(looks_like_rust): Use parse_legacy_escape.
+	(rust_demangle_sym): Use parse_legacy_escape.
+	* testsuite/rust-demangle-expected: Add 'llv$u6d$' test.
+
+2019-08-27  Martin Liska  <mliska@suse.cz>
+
+	PR lto/91478
+	* simple-object-elf.c (simple_object_elf_copy_lto_debug_sections):
+	First find a WEAK HIDDEN symbol in symbol table that will be
+	preserved.  Later, use the symbol name for all removed symbols.
+
+2019-08-12  Martin Liska  <mliska@suse.cz>
+
+	* Makefile.in: Add filedescriptor.c.
+	* filedescriptor.c: New file.
+	* lrealpath.c (is_valid_fd): Remove.

diff --git a/libiberty/Makefile.in b/libiberty/Makefile.in
index 0be45b4ae8..fe738d0db4 100644
--- a/libiberty/Makefile.in
+++ b/libiberty/Makefile.in
@@ -1,7 +1,7 @@
 # Makefile for the libiberty library.
 # Originally written by K. Richard Pixley <rich@cygnus.com>.
 #
-# Copyright (C) 1990-2019 Free Software Foundation, Inc.
+# Copyright (C) 1990-2020 Free Software Foundation, Inc.
 #
 # This file is part of the libiberty library.
 # Libiberty is free software; you can redistribute it and/or
@@ -127,7 +127,7 @@ CFILES = alloca.c argv.c asprintf.c atexit.c				\
 	calloc.c choose-temp.c clock.c concat.c cp-demangle.c		\
 	 cp-demint.c cplus-dem.c crc32.c				\
 	d-demangle.c dwarfnames.c dyn-string.c				\
-	fdmatch.c ffs.c fibheap.c filename_cmp.c floatformat.c		\
+	fdmatch.c ffs.c fibheap.c filedescriptor.c filename_cmp.c floatformat.c		\
 	fnmatch.c fopen_unlocked.c					\
 	getcwd.c getopt.c getopt1.c getpagesize.c getpwd.c getruntime.c	\
          gettimeofday.c                                                 \
@@ -171,6 +171,7 @@ REQUIRED_OFILES =							\
 	./cp-demint.$(objext) ./crc32.$(objext) ./d-demangle.$(objext)	\
 	./dwarfnames.$(objext) ./dyn-string.$(objext)			\
 	./fdmatch.$(objext) ./fibheap.$(objext)				\
+	./filedescriptor.$(objext)	\
 	./filename_cmp.$(objext) ./floatformat.$(objext)		\
 	./fnmatch.$(objext) ./fopen_unlocked.$(objext)			\
 	./getopt.$(objext) ./getopt1.$(objext) ./getpwd.$(objext)	\
@@ -756,6 +757,17 @@ $(CONFIGURED_OFILES): stamp-picdir stamp-noasandir
 	else true; fi
 	$(COMPILE.c) $(srcdir)/fibheap.c $(OUTPUT_OPTION)

+./filedescriptor.$(objext): $(srcdir)/filedescriptor.c config.h $(INCDIR)/ansidecl.h \
+	$(INCDIR)/libiberty.h
+	if [ x"$(PICFLAG)" != x ]; then \
+	  $(COMPILE.c) $(PICFLAG) $(srcdir)/filedescriptor.c -o pic/$@; \
+	else true; fi
+	if [ x"$(NOASANFLAG)" != x ]; then \
+	  $(COMPILE.c) $(PICFLAG) $(NOASANFLAG) $(srcdir)/filedescriptor.c -o noasan/$@; \
+	else true; fi
+	$(COMPILE.c) $(srcdir)/filedescriptor.c $(OUTPUT_OPTION)
+
+
 ./filename_cmp.$(objext): $(srcdir)/filename_cmp.c config.h $(INCDIR)/ansidecl.h \
 	$(INCDIR)/filenames.h $(INCDIR)/hashtab.h \
 	$(INCDIR)/safe-ctype.h
diff --git a/libiberty/_doprnt.c b/libiberty/_doprnt.c
index d44dc415ed..a739f4304f 100644
--- a/libiberty/_doprnt.c
+++ b/libiberty/_doprnt.c
@@ -1,5 +1,5 @@
 /* Provide a version of _doprnt in terms of fprintf.
-   Copyright (C) 1998-2019 Free Software Foundation, Inc.
+   Copyright (C) 1998-2020 Free Software Foundation, Inc.
    Contributed by Kaveh Ghazi  (ghazi@caip.rutgers.edu)  3/29/98

 This program is free software; you can redistribute it and/or modify it
diff --git a/libiberty/argv.c b/libiberty/argv.c
index 6444896f99..8c9794db6a 100644
--- a/libiberty/argv.c
+++ b/libiberty/argv.c
@@ -1,5 +1,5 @@
 /* Create and destroy argument vectors (argv's)
-   Copyright (C) 1992-2019 Free Software Foundation, Inc.
+   Copyright (C) 1992-2020 Free Software Foundation, Inc.
    Written by Fred Fish @ Cygnus Support

 This file is part of the libiberty library.
diff --git a/libiberty/asprintf.c b/libiberty/asprintf.c
index 5718682f69..6e38e2234d 100644
--- a/libiberty/asprintf.c
+++ b/libiberty/asprintf.c
@@ -1,6 +1,6 @@
 /* Like sprintf but provides a pointer to malloc'd storage, which must
    be freed by the caller.
-   Copyright (C) 1997-2019 Free Software Foundation, Inc.
+   Copyright (C) 1997-2020 Free Software Foundation, Inc.
    Contributed by Cygnus Solutions.

 This file is part of the libiberty library.
diff --git a/libiberty/choose-temp.c b/libiberty/choose-temp.c
index 72c1b710bd..49a2faaa51 100644
--- a/libiberty/choose-temp.c
+++ b/libiberty/choose-temp.c
@@ -1,5 +1,5 @@
 /* Utility to pick a temporary filename prefix.
-   Copyright (C) 1996-2019 Free Software Foundation, Inc.
+   Copyright (C) 1996-2020 Free Software Foundation, Inc.

 This file is part of the libiberty library.
 Libiberty is free software; you can redistribute it and/or
diff --git a/libiberty/clock.c b/libiberty/clock.c
index a3730714bd..0de74657d0 100644
--- a/libiberty/clock.c
+++ b/libiberty/clock.c
@@ -1,5 +1,5 @@
 /* ANSI-compatible clock function.
-   Copyright (C) 1994-2019 Free Software Foundation, Inc.
+   Copyright (C) 1994-2020 Free Software Foundation, Inc.

 This file is part of the libiberty library.  This library is free
 software; you can redistribute it and/or modify it under the
diff --git

1 files changed, 50 insertions, 23 deletions

diff --git a/libiberty/simple-object-elf.c b/libiberty/simple-object-elf.c
index 7515926..c62d5bb 100644
--- a/libiberty/simple-object-elf.c
+++ b/libiberty/simple-object-elf.c
@@ -1,5 +1,5 @@
 /* simple-object-elf.c -- routines to manipulate ELF object files.
-   Copyright (C) 2010-2019 Free Software Foundation, Inc.
+   Copyright (C) 2010-2020 Free Software Foundation, Inc.
    Written by Ian Lance Taylor, Google.
 
 This program is free software; you can redistribute it and/or modify it
@@ -1366,30 +1366,17 @@ simple_object_elf_copy_lto_debug_sections (simple_object_read *sobj,
 	  return errmsg;
 	}
 
-      /* If we are processing .symtab purge __gnu_lto_slim symbol
-	 from it and any symbols in discarded sections.  */
+      /* If we are processing .symtab purge any symbols
+	 in discarded sections.  */
       if (sh_type == SHT_SYMTAB)
 	{
 	  unsigned entsize = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
 					      shdr, sh_entsize, Elf_Addr);
 	  unsigned strtab = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
 					     shdr, sh_link, Elf_Word);
-	  unsigned char *strshdr = shdrs + (strtab - 1) * shdr_size;
-	  off_t stroff = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
-					  strshdr, sh_offset, Elf_Addr);
-	  size_t strsz = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
-					  strshdr, sh_size, Elf_Addr);
-	  char *strings = XNEWVEC (char, strsz);
-	  char *gnu_lto = strings;
+	  size_t prevailing_name_idx = 0;
 	  unsigned char *ent;
 	  unsigned *shndx_table = NULL;
-	  simple_object_internal_read (sobj->descriptor,
-				       sobj->offset + stroff,
-				       (unsigned char *)strings,
-				       strsz, &errmsg, err);
-	  /* Find first '\0' in strings.  */
-	  gnu_lto = (char *) memchr (gnu_lto + 1, '\0',
-				     strings + strsz - gnu_lto);
 	  /* Read the section index table if present.  */
 	  if (symtab_indices_shndx[i - 1] != 0)
 	    {
@@ -1404,6 +1391,45 @@ simple_object_elf_copy_lto_debug_sections (simple_object_read *sobj,
 					   (unsigned char *)shndx_table,
 					   sidxsz, &errmsg, err);
 	    }
+
+	  /* Find a WEAK HIDDEN symbol which name we will use for removed
+	     symbols.  We know there's a prevailing weak hidden symbol
+	     at the start of the .debug_info section.  */
+	  for (ent = buf; ent < buf + length; ent += entsize)
+	    {
+	      unsigned st_shndx = ELF_FETCH_FIELD (type_functions, ei_class,
+						   Sym, ent,
+						   st_shndx, Elf_Half);
+	      unsigned char *st_info;
+	      unsigned char *st_other;
+	      if (ei_class == ELFCLASS32)
+		{
+		  st_info = &((Elf32_External_Sym *)ent)->st_info;
+		  st_other = &((Elf32_External_Sym *)ent)->st_other;
+		}
+	      else
+		{
+		  st_info = &((Elf64_External_Sym *)ent)->st_info;
+		  st_other = &((Elf64_External_Sym *)ent)->st_other;
+		}
+	      if (st_shndx == SHN_XINDEX)
+		st_shndx = type_functions->fetch_Elf_Word
+		    ((unsigned char *)(shndx_table + (ent - buf) / entsize));
+
+	      if (st_shndx != SHN_COMMON
+		  && !(st_shndx != SHN_UNDEF
+		       && st_shndx < shnum
+		       && pfnret[st_shndx - 1] == -1)
+		  && ELF_ST_BIND (*st_info) == STB_WEAK
+		  && *st_other == STV_HIDDEN)
+		{
+		  prevailing_name_idx = ELF_FETCH_FIELD (type_functions,
+							 ei_class, Sym, ent,
+							 st_name, Elf_Word);
+		  break;
+		}
+	    }
+
 	  for (ent = buf; ent < buf + length; ent += entsize)
 	    {
 	      unsigned st_shndx = ELF_FETCH_FIELD (type_functions, ei_class,
@@ -1426,9 +1452,10 @@ simple_object_elf_copy_lto_debug_sections (simple_object_read *sobj,
 	      if (st_shndx == SHN_XINDEX)
 		st_shndx = type_functions->fetch_Elf_Word
 		    ((unsigned char *)(shndx_table + (ent - buf) / entsize));
-	      /* Eliminate all COMMONs - this includes __gnu_lto_v1
-		 and __gnu_lto_slim which otherwise cause endless
-		 LTO plugin invocation.  */
+	      /* Eliminate all COMMONs - this includes __gnu_lto_slim
+		 which otherwise cause endless LTO plugin invocation.
+		 FIXME: remove the condition once we remove emission
+		 of __gnu_lto_slim symbol.  */
 	      if (st_shndx == SHN_COMMON)
 		discard = 1;
 	      /* We also need to remove symbols refering to sections
@@ -1460,12 +1487,13 @@ simple_object_elf_copy_lto_debug_sections (simple_object_read *sobj,
 		  else
 		    {
 		      /* Make discarded global symbols hidden weak
-			 undefined and sharing the gnu_lto_ name.  */
+			 undefined and sharing a name of a prevailing
+			 symbol.  */
 		      bind = STB_WEAK;
 		      other = STV_HIDDEN;
 		      ELF_SET_FIELD (type_functions, ei_class, Sym,
 				     ent, st_name, Elf_Word,
-				     gnu_lto - strings);
+				     prevailing_name_idx);
 		      ELF_SET_FIELD (type_functions, ei_class, Sym,
 				     ent, st_shndx, Elf_Half, SHN_UNDEF);
 		    }
@@ -1482,7 +1510,6 @@ simple_object_elf_copy_lto_debug_sections (simple_object_read *sobj,
 		ELF_SET_FIELD (type_functions, ei_class, Sym,
 			       ent, st_shndx, Elf_Half, sh_map[st_shndx]);
 	    }
-	  XDELETEVEC (strings);
 	  XDELETEVEC (shndx_table);
 	}
       else if (sh_type == SHT_GROUP)