From aa713662e8c8349dbf475437e8db72ffd9a9cc4d Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Wed, 22 May 2002 05:08:31 +0000
Subject: [PATCH] 2002-05-21  H.J. Lu  (hjl@gnu.org)

	* emultempl/elf32.em (gld${EMULATION_NAME}_parse_args): Handle
	"-z muldefs".
	(gld${EMULATION_NAME}_list_options): Add "-z muldefs".

	* ld.texinfo: Updated for --allow-multiple-definition and
	"-z muldefs".

	* ldmain.c (main): Initialize the allow_multiple_definition
	field to false.

	* lexsup.c (OPTION_ALLOW_MULTIPLE_DEFINITION): New.
	(ld_options): Add --allow-multiple-definition.
	(parse_args): Support OPTION_ALLOW_MULTIPLE_DEFINITION.
---
 ld/ChangeLog          | 16 ++++++++++++++++
 ld/emultempl/elf32.em |  3 +++
 ld/ld.texinfo         |  9 +++++++++
 ld/ldmain.c           |  1 +
 ld/lexsup.c           |  8 +++++++-
 5 files changed, 36 insertions(+), 1 deletion(-)

diff --git a/ld/ChangeLog b/ld/ChangeLog
index 920129ad357..4d2bc18e7c5 100644
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,3 +1,19 @@
+2002-05-21  H.J. Lu  (hjl@gnu.org)
+
+	* emultempl/elf32.em (gld${EMULATION_NAME}_parse_args): Handle
+	"-z muldefs".
+	(gld${EMULATION_NAME}_list_options): Add "-z muldefs".
+
+	* ld.texinfo: Updated for --allow-multiple-definition and
+	"-z muldefs".
+
+	* ldmain.c (main): Initialize the allow_multiple_definition
+	field to false.
+
+	* lexsup.c (OPTION_ALLOW_MULTIPLE_DEFINITION): New.
+	(ld_options): Add --allow-multiple-definition.
+	(parse_args): Support OPTION_ALLOW_MULTIPLE_DEFINITION.
+
 2002-05-21  Jason Thorpe  <thorpej@wasabisystems.com>
 
 	* Makefile.am (ALL_EMULATIONS): Add earmelfb_nbsd.o.
diff --git a/ld/emultempl/elf32.em b/ld/emultempl/elf32.em
index 077a8fc0f32..5f12e69f072 100644
--- a/ld/emultempl/elf32.em
+++ b/ld/emultempl/elf32.em
@@ -1541,6 +1541,8 @@ cat >>e${EMULATION_NAME}.c <<EOF
 	}
       else if (strcmp (optarg, "defs") == 0)
 	link_info.no_undefined = true;
+      else if (strcmp (optarg, "muldefs") == 0)
+	link_info.allow_multiple_definition = true;
       else if (strcmp (optarg, "combreloc") == 0)
 	link_info.combreloc = true;
       else if (strcmp (optarg, "nocombreloc") == 0)
@@ -1589,6 +1591,7 @@ cat >>e${EMULATION_NAME}.c <<EOF
   fprintf (file, _("  -z initfirst\t\tMark DSO to be initialized first at runtime\n"));
   fprintf (file, _("  -z interpose\t\tMark object to interpose all DSOs but executable\n"));
   fprintf (file, _("  -z loadfltr\t\tMark object requiring immediate process\n"));
+  fprintf (file, _("  -z muldefs\t\tAllow multiple definitions\n"));
   fprintf (file, _("  -z nocombreloc\tDon't merge dynamic relocs into one section\n"));
   fprintf (file, _("  -z nocopyreloc\tDon't create copy relocs\n"));
   fprintf (file, _("  -z nodefaultlib\tMark object not to use default search paths\n"));
diff --git a/ld/ld.texinfo b/ld/ld.texinfo
index a884ffdf849..b7fa2a9839c 100644
--- a/ld/ld.texinfo
+++ b/ld/ld.texinfo
@@ -859,6 +859,7 @@ of this object will ignore any default library search paths.
 @code{now} marks the object with the non-lazy runtime binding.
 @code{origin} marks the object may contain $ORIGIN.
 @code{defs} disallows undefined symbols.
+@code{muldefs} allows multiple definitions.
 @code{combreloc} combines multiple reloc sections and sorts them
 to make dynamic symbol lookup caching possible.
 @code{nocombreloc} disables multiple reloc sections combining.
@@ -1080,6 +1081,14 @@ Normally when creating a non-symbolic shared library, undefined symbols
 are allowed and left to be resolved by the runtime loader.  These options
 disallows such undefined symbols.
 
+@kindex --allow-multiple-definition
+@kindex -z muldefs
+@item --allow-multiple-definition
+@itemx -z muldefs
+Normally when a symbol is defined multiple times, the linker will
+report a fatal error. These options allow multiple definitions and the
+first definition will be used.
+
 @kindex --allow-shlib-undefined
 @item --allow-shlib-undefined
 Allow undefined symbols in shared objects even  when --no-undefined is
diff --git a/ld/ldmain.c b/ld/ldmain.c
index 814fc9d04bd..25ae5ec4bc2 100644
--- a/ld/ldmain.c
+++ b/ld/ldmain.c
@@ -239,6 +239,7 @@ main (argc, argv)
   link_info.optimize = false;
   link_info.no_undefined = false;
   link_info.allow_shlib_undefined = false;
+  link_info.allow_multiple_definition = false;
   link_info.strip = strip_none;
   link_info.discard = discard_sec_merge;
   link_info.keep_memory = true;
diff --git a/ld/lexsup.c b/ld/lexsup.c
index cbde50960f7..ddaf692935f 100644
--- a/ld/lexsup.c
+++ b/ld/lexsup.c
@@ -126,7 +126,8 @@ int parsing_defsym = 0;
 #define OPTION_UNIQUE			(OPTION_SECTION_START + 1)
 #define OPTION_TARGET_HELP              (OPTION_UNIQUE + 1)
 #define OPTION_ALLOW_SHLIB_UNDEFINED	(OPTION_TARGET_HELP + 1)
-#define OPTION_DISCARD_NONE		(OPTION_ALLOW_SHLIB_UNDEFINED + 1)
+#define OPTION_ALLOW_MULTIPLE_DEFINITION (OPTION_ALLOW_SHLIB_UNDEFINED + 1)
+#define OPTION_DISCARD_NONE		(OPTION_ALLOW_MULTIPLE_DEFINITION + 1)
 #define OPTION_SPARE_DYNAMIC_TAGS	(OPTION_DISCARD_NONE + 1)
 #define OPTION_NO_DEFINE_COMMON		(OPTION_SPARE_DYNAMIC_TAGS + 1)
 #define OPTION_NOSTDLIB			(OPTION_NO_DEFINE_COMMON + 1)
@@ -319,6 +320,8 @@ static const struct ld_option ld_options[] =
      '\0', NULL, N_("Allow no undefined symbols"), TWO_DASHES },
   { {"allow-shlib-undefined", no_argument, NULL, OPTION_ALLOW_SHLIB_UNDEFINED},
      '\0', NULL, N_("Allow undefined symbols in shared objects"), TWO_DASHES },
+  { {"allow-multiple-definition", no_argument, NULL, OPTION_ALLOW_MULTIPLE_DEFINITION},
+     '\0', NULL, N_("Allow multiple definitions"), TWO_DASHES },
   { {"no-warn-mismatch", no_argument, NULL, OPTION_NO_WARN_MISMATCH},
       '\0', NULL, N_("Don't warn about mismatched input files"), TWO_DASHES},
   { {"no-whole-archive", no_argument, NULL, OPTION_NO_WHOLE_ARCHIVE},
@@ -761,6 +764,9 @@ parse_args (argc, argv)
 	case OPTION_ALLOW_SHLIB_UNDEFINED:
 	  link_info.allow_shlib_undefined = true;
 	  break;
+	case OPTION_ALLOW_MULTIPLE_DEFINITION:
+	  link_info.allow_multiple_definition = true;
+	  break;
 	case OPTION_NO_WARN_MISMATCH:
 	  command_line.warn_mismatch = false;
 	  break;
-- 
2.30.2