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Upstream-Status="Inappropriate [distribution: codesourcery]"

Patch originally created by Mark Hatle, forward-ported to
binutils 2.21 by Scott Garman.

purpose:  warn for uses of system directories when cross linking

Code Merged from Sourcery G++ binutils 2.19 - 4.4-277

2008-07-02  Joseph Myers  <joseph@codesourcery.com>

    ld/
    * ld.h (args_type): Add error_poison_system_directories.
    * ld.texinfo (--error-poison-system-directories): Document.
    * ldfile.c (ldfile_add_library_path): Check
    command_line.error_poison_system_directories.
    * ldmain.c (main): Initialize
    command_line.error_poison_system_directories.
    * lexsup.c (enum option_values): Add
    OPTION_ERROR_POISON_SYSTEM_DIRECTORIES.
    (ld_options): Add --error-poison-system-directories.
    (parse_args): Handle new option.

2007-06-13  Joseph Myers  <joseph@codesourcery.com>

    ld/
    * config.in: Regenerate.
    * ld.h (args_type): Add poison_system_directories.
    * ld.texinfo (--no-poison-system-directories): Document.
    * ldfile.c (ldfile_add_library_path): Check
    command_line.poison_system_directories.
    * ldmain.c (main): Initialize
    command_line.poison_system_directories.
    * lexsup.c (enum option_values): Add
    OPTION_NO_POISON_SYSTEM_DIRECTORIES.
    (ld_options): Add --no-poison-system-directories.
    (parse_args): Handle new option.

2007-04-20  Joseph Myers  <joseph@codesourcery.com>

    Merge from Sourcery G++ binutils 2.17:

    2007-03-20  Joseph Myers  <joseph@codesourcery.com>
    Based on patch by Mark Hatle <mark.hatle@windriver.com>.
    ld/
    * configure.in (--enable-poison-system-directories): New option.
    * configure, config.in: Regenerate.
    * ldfile.c (ldfile_add_library_path): If
    ENABLE_POISON_SYSTEM_DIRECTORIES defined, warn for use of /lib,
    /usr/lib, /usr/local/lib or /usr/X11R6/lib.

Signed-off-by: Mark Hatle <mark.hatle@windriver.com>
Signed-off-by: Scott Garman <scott.a.garman@intel.com>

diff -urN binutils-2.21.orig//ld/config.in binutils-2.21/ld/config.in
--- binutils-2.21.orig//ld/config.in	2010-11-05 03:34:27.000000000 -0700
+++ binutils-2.21/ld/config.in	2011-01-19 10:48:15.147301022 -0800
@@ -4,6 +4,9 @@
    language is requested. */
 #undef ENABLE_NLS
 
+/* Define to warn for use of native system library directories */
+#undef ENABLE_POISON_SYSTEM_DIRECTORIES
+
 /* Additional extension a shared object might have. */
 #undef EXTRA_SHLIB_EXTENSION
 
diff -urN binutils-2.21.orig//ld/configure binutils-2.21/ld/configure
--- binutils-2.21.orig//ld/configure	2011-01-19 10:46:46.997571921 -0800
+++ binutils-2.21/ld/configure	2011-01-19 11:03:50.577832729 -0800
@@ -768,6 +768,7 @@
 enable_targets
 enable_64_bit_bfd
 with_sysroot
+enable_poison_system_directories
 enable_gold
 enable_got
 enable_werror
@@ -1418,6 +1419,8 @@
 			  (and sometimes confusing) to the casual installer
   --enable-targets        alternative target configurations
   --enable-64-bit-bfd     64-bit support (on hosts with narrower word sizes)
+  --enable-poison-system-directories
+                          warn for use of native system library directories
   --enable-gold[=ARG]     build gold [ARG={default,yes,no}]
   --enable-got=<type>     GOT handling scheme (target, single, negative,
                           multigot)
@@ -4203,7 +4206,18 @@
 fi
 
 
+# Check whether --enable-poison-system-directories was given.
+if test "${enable_poison_system_directories+set}" = set; then :
+  enableval=$enable_poison_system_directories;
+else
+  enable_poison_system_directories=no
+fi
+
+if test "x${enable_poison_system_directories}" = "xyes"; then
 
+$as_echo "#define ENABLE_POISON_SYSTEM_DIRECTORIES 1" >>confdefs.h
+
+fi
 
 # Check whether --enable-got was given.
 if test "${enable_got+set}" = set; then :
diff -urN binutils-2.21.orig//ld/configure.in binutils-2.21/ld/configure.in
--- binutils-2.21.orig//ld/configure.in	2010-11-23 05:50:32.000000000 -0800
+++ binutils-2.21/ld/configure.in	2011-01-19 10:50:57.378398946 -0800
@@ -69,6 +69,16 @@
 AC_SUBST(TARGET_SYSTEM_ROOT)
 AC_SUBST(TARGET_SYSTEM_ROOT_DEFINE)
 
+AC_ARG_ENABLE([poison-system-directories],
+         AS_HELP_STRING([--enable-poison-system-directories],
+                [warn for use of native system library directories]),,
+         [enable_poison_system_directories=no])
+if test "x${enable_poison_system_directories}" = "xyes"; then
+  AC_DEFINE([ENABLE_POISON_SYSTEM_DIRECTORIES],
+       [1],
+       [Define to warn for use of native system library directories])
+fi
+
 dnl Use --enable-gold to decide if this linker should be the default.
 dnl "install_as_default" is set to false if gold is the default linker.
 dnl "installed_linker" is the installed BFD linker name.
diff -urN binutils-2.21.orig//ld/ldfile.c binutils-2.21/ld/ldfile.c
--- binutils-2.21.orig//ld/ldfile.c	2011-01-19 10:46:47.157553281 -0800
+++ binutils-2.21/ld/ldfile.c	2011-01-19 10:58:30.035468447 -0800
@@ -124,6 +124,23 @@
     {
       new_dirs->name = xstrdup (name);
       new_dirs->sysrooted = is_sysrooted_pathname (name, FALSE);
+
+#ifdef ENABLE_POISON_SYSTEM_DIRECTORIES
+      if (command_line.poison_system_directories
+     && ((!strncmp (name, "/lib", 4))
+         || (!strncmp (name, "/usr/lib", 8))
+         || (!strncmp (name, "/usr/local/lib", 14))
+         || (!strncmp (name, "/usr/X11R6/lib", 14))))
+   {
+     if (command_line.error_poison_system_directories)
+       einfo (_("%X%P: error: library search path \"%s\" is unsafe for "
+            "cross-compilation\n"), name);
+     else
+       einfo (_("%P: warning: library search path \"%s\" is unsafe for "
+            "cross-compilation\n"), name);
+   }
+#endif
+
     }
 }
 
diff -urN binutils-2.21.orig//ld/ld.h binutils-2.21/ld/ld.h
--- binutils-2.21.orig//ld/ld.h	2009-11-26 05:45:25.000000000 -0800
+++ binutils-2.21/ld/ld.h	2011-01-19 10:52:54.814716478 -0800
@@ -198,6 +198,14 @@
      input files.  */
   bfd_boolean accept_unknown_input_arch;
 
+  /* If TRUE (the default) warn for uses of system directories when
+     cross linking.  */
+  bfd_boolean poison_system_directories;
+
+  /* If TRUE (default FALSE) give an error for uses of system
+     directories when cross linking instead of a warning.  */
+  bfd_boolean error_poison_system_directories;
+
   /* Big or little endian as set on command line.  */
   enum endian_enum endian;
 
diff -urN binutils-2.21.orig//ld/ldmain.c binutils-2.21/ld/ldmain.c
--- binutils-2.21.orig//ld/ldmain.c	2010-11-05 00:20:07.000000000 -0700
+++ binutils-2.21/ld/ldmain.c	2011-01-19 10:59:18.579767697 -0800
@@ -259,6 +259,8 @@
   command_line.warn_search_mismatch = TRUE;
   command_line.check_section_addresses = -1;
   command_line.disable_target_specific_optimizations = -1;
+  command_line.poison_system_directories = TRUE;
+  command_line.error_poison_system_directories = FALSE;
 
   /* We initialize DEMANGLING based on the environment variable
      COLLECT_NO_DEMANGLE.  The gcc collect2 program will demangle the
diff -urN binutils-2.21.orig//ld/ld.texinfo binutils-2.21/ld/ld.texinfo
--- binutils-2.21.orig//ld/ld.texinfo	2010-10-28 04:40:26.000000000 -0700
+++ binutils-2.21/ld/ld.texinfo	2011-01-19 10:56:04.452567113 -0800
@@ -2133,6 +2133,18 @@
 
 Passing @code{none} for @var{style} disables the setting from any
 @code{--build-id} options earlier on the command line.
+
+@kindex --no-poison-system-directories
+@item --no-poison-system-directories
+Do not warn for @option{-L} options using system directories such as
+@file{/usr/lib} when cross linking.  This option is intended for use
+in chroot environments when such directories contain the correct
+libraries for the target system rather than the host.
+
+@kindex --error-poison-system-directories
+@item --error-poison-system-directories
+Give an error instead of a warning for @option{-L} options using
+system directories when cross linking.
 @end table
 
 @c man end
diff -urN binutils-2.21.orig//ld/lexsup.c binutils-2.21/ld/lexsup.c
--- binutils-2.21.orig//ld/lexsup.c	2010-10-27 23:45:33.000000000 -0700
+++ binutils-2.21/ld/lexsup.c	2011-01-19 11:02:07.799898432 -0800
@@ -175,6 +175,8 @@
   OPTION_PLUGIN_OPT,
 #endif /* ENABLE_PLUGINS */
   OPTION_DEFAULT_SCRIPT,
+  OPTION_NO_POISON_SYSTEM_DIRECTORIES,
+  OPTION_ERROR_POISON_SYSTEM_DIRECTORIES
 };
 
 /* The long options.  This structure is used for both the option
@@ -603,6 +605,14 @@
     TWO_DASHES },
   { {"wrap", required_argument, NULL, OPTION_WRAP},
     '\0', N_("SYMBOL"), N_("Use wrapper functions for SYMBOL"), TWO_DASHES },
+  { {"no-poison-system-directories", no_argument, NULL,
+     OPTION_NO_POISON_SYSTEM_DIRECTORIES},
+    '\0', NULL, N_("Do not warn for -L options using system directories"),
+    TWO_DASHES },
+  { {"error-poison-system-directories", no_argument, NULL,
+     OPTION_ERROR_POISON_SYSTEM_DIRECTORIES},
+    '\0', NULL, N_("Give an error for -L options using system directories"),
+    TWO_DASHES },
 };
 
 #define OPTION_COUNT ARRAY_SIZE (ld_options)
@@ -1518,6 +1528,14 @@
               einfo (_("%P%X: --hash-size needs a numeric argument\n"));
           }
           break;
+
+   case OPTION_NO_POISON_SYSTEM_DIRECTORIES:
+     command_line.poison_system_directories = FALSE;
+     break;
+
+   case OPTION_ERROR_POISON_SYSTEM_DIRECTORIES:
+     command_line.error_poison_system_directories = TRUE;
+     break;
 	}
     }