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 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 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 Merge from Sourcery G++ binutils 2.17: 2007-03-20 Joseph Myers Based on patch by Mark Hatle . 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 Signed-off-by: Scott Garman 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= 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; } }