Add -z globalaudit linker command line option to set the DF_GLOBALAUDIT flag bit in the dynamic tags.

* emultempl/elf32.em (handle_option): Accept the -z globalaudit
	command line option.
	* lexsup.c (elf_static_list_options): Add -z globalaudit.
	* ld.texinfo: Document the support for the new command line
	option.
	* NEWS: Mention the new feature.
	* testsuite/ld-elf/audit.exp: Add a test of the -z globalaudit
	command line option.
	* testsuite/ld-elf/globalaudit.rd: New file: Expected output from
	readelf.

ld/ChangeLog

@@ -1,3 +1,16 @@
+2017-08-11  Nick Clifton  <nickc@redhat.com>
+
+	* emultempl/elf32.em (handle_option): Accept the -z globalaudit
+	command line option.
+	* lexsup.c (elf_static_list_options): Add -z globalaudit.
+	* ld.texinfo: Document the support for the new command line
+	option.
+	* NEWS: Mention the new feature.
+	* testsuite/ld-elf/audit.exp: Add a test of the -z globalaudit
+	command line option.
+	* testsuite/ld-elf/globalaudit.rd: New file: Expected output from
+	readelf.
+
 2017-08-11  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR ld/21884

ld/NEWS

@@ -1,4 +1,7 @@
 -*- text -*-
+* Add -z globalaudit command line option to force audit libraries to be run
+  for every dynamic object loaded by an executable - provided that the loader
+  supports this functionality. 
 
 * Tighten linker script grammar around file name specifiers to prevent the use
   of SORT_BY_ALIGNMENT and SORT_BY_INIT_PRIORITY on filenames.  These would

ld/emultempl/elf32.em

@@ -2676,6 +2676,10 @@ fragment <<EOF
 	  link_info.noexecstack = TRUE;
 	  link_info.execstack = FALSE;
 	}
+      else if (strcmp (optarg, "globalaudit") == 0)
+	{
+	  link_info.flags_1 |= DF_1_GLOBAUDIT;
+	}
 EOF
 
 if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then

ld/ld.texinfo

@@ -1136,6 +1136,14 @@ This option is only meaningful when building a shared object.  It makes
 the symbols defined by this shared object available for symbol resolution
 of subsequently loaded libraries.
 
+@item globalaudit
+This option is only meaningful when building a dynamic executable.
+This option marks the executable as requiring global auditing by
+setting the @code{DF_1_GLOBAUDIT} bit in the @code{DT_FLAGS_1} dynamic
+tag.  Global auditing requires that any auditing library defined via
+the @option{--depaudit} or @option{-P} command line options be run for
+all dynamic objects loaded by the application. 
+
 @item initfirst
 This option is only meaningful when building a shared object.
 It marks the object so that its runtime initialization will occur

ld/lexsup.c

@@ -1828,6 +1828,8 @@ elf_static_list_options (FILE *file)
   -z execstack                Mark executable as requiring executable stack\n"));
   fprintf (file, _("\
   -z noexecstack              Mark executable as not requiring executable stack\n"));
+  fprintf (file, _("\
+  -z globalaudit              Mark executable requiring global auditing\n"));
 }
 
 static void

ld/testsuite/ld-elf/audit.exp

@@ -60,6 +60,9 @@ set build_tests {
   {"Run with -lusesaudit -lusesaudit2"
      "-Ltmpdir/ -lusesaudit -lusesaudit2" ""
      {main.c} {{"readelf" {-d} "depaudit2.rd"}} "useslibusesaudit2.out"}
+  {"Link with -z globalaudit"
+     "-Wl,-Paudit.so -Wl,-z,globalaudit" ""
+     {main.c} {{"readelf" {-d} "globalaudit.rd"}} "globalaudit.out"}	
 }
 
 run_cc_link_tests $build_tests

ld/testsuite/ld-elf/globalaudit.rd

@@ -0,0 +1,3 @@
+#...
+.*\(FLAGS_1\).*Flags: GLOBAUDIT
+#pass