From 09a32a40b34477cd787deb12833c063a09dea7b2 Mon Sep 17 00:00:00 2001 From: Khem Raj Date: Fri, 29 Mar 2013 08:59:00 +0400 Subject: [PATCH 02/40] gcc: poison-system-directories Add /sw/include and /opt/include based on the original zecke-no-host-includes.patch patch. The original patch checked for /usr/include, /sw/include and /opt/include and then triggered a failure and aborted. Instead, we add the two missing items to the current scan. If the user wants this to be a failure, they can add "-Werror=poison-system-directories". Signed-off-by: Mark Hatle Signed-off-by: Khem Raj Upstream-Status: Pending --- gcc/common.opt | 4 ++++ gcc/config.in | 6 ++++++ gcc/configure | 16 ++++++++++++++++ gcc/configure.ac | 10 ++++++++++ gcc/doc/invoke.texi | 9 +++++++++ gcc/gcc.c | 2 ++ gcc/incpath.c | 21 +++++++++++++++++++++ 7 files changed, 68 insertions(+) diff --git a/gcc/common.opt b/gcc/common.opt index dfed6ec76ba..8bb65e0e1af 100644 --- a/gcc/common.opt +++ b/gcc/common.opt @@ -682,6 +682,10 @@ Wreturn-local-addr Common Var(warn_return_local_addr) Init(1) Warning Warn about returning a pointer/reference to a local or temporary variable. +Wpoison-system-directories +Common Var(flag_poison_system_directories) Init(1) Warning +Warn for -I and -L options using system directories if cross compiling + Wshadow Common Var(warn_shadow) Warning Warn when one variable shadows another. Same as -Wshadow=global. diff --git a/gcc/config.in b/gcc/config.in index 364eba47737..9551c0dfdf9 100644 --- a/gcc/config.in +++ b/gcc/config.in @@ -224,6 +224,12 @@ #endif +/* Define to warn for use of native system header directories */ +#ifndef USED_FOR_TARGET +#undef ENABLE_POISON_SYSTEM_DIRECTORIES +#endif + + /* Define if you want all operations on RTL (the basic data structure of the optimizer and back end) to be checked for dynamic type safety at runtime. This is quite expensive. */ diff --git a/gcc/configure b/gcc/configure index b4088d8fd1e..793530e21cf 100755 --- a/gcc/configure +++ b/gcc/configure @@ -1010,6 +1010,7 @@ with_system_zlib enable_maintainer_mode enable_link_mutex enable_version_specific_runtime_libs +enable_poison_system_directories enable_plugin enable_host_shared enable_libquadmath_support @@ -1766,6 +1767,8 @@ Optional Features: --enable-version-specific-runtime-libs specify that runtime libraries should be installed in a compiler-specific directory + --enable-poison-system-directories + warn for use of native system header directories --enable-plugin enable plugin support --enable-host-shared build host code as shared libraries --disable-libquadmath-support @@ -30271,6 +30274,19 @@ if test "${enable_version_specific_runtime_libs+set}" = set; then : fi +# Check whether --enable-poison-system-directories was given. +if test "${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 + +$as_echo "#define ENABLE_POISON_SYSTEM_DIRECTORIES 1" >>confdefs.h + +fi + # Substitute configuration variables diff --git a/gcc/configure.ac b/gcc/configure.ac index 070b9c6c497..0fd438e39e5 100644 --- a/gcc/configure.ac +++ b/gcc/configure.ac @@ -6605,6 +6605,16 @@ AC_ARG_ENABLE(version-specific-runtime-libs, [specify that runtime libraries should be installed in a compiler-specific directory])]) +AC_ARG_ENABLE([poison-system-directories], + AS_HELP_STRING([--enable-poison-system-directories], + [warn for use of native system header directories]),, + [enable_poison_system_directories=no]) +if test "x${enable_poison_system_directories}" = "xyes"; then + AC_DEFINE([ENABLE_POISON_SYSTEM_DIRECTORIES], + [1], + [Define to warn for use of native system header directories]) +fi + # Substitute configuration variables AC_SUBST(subdirs) AC_SUBST(srcdir) diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 0d532a64bfe..86e57038042 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -348,6 +348,7 @@ Objective-C and Objective-C++ Dialects}. -Wpacked -Wno-packed-bitfield-compat -Wpacked-not-aligned -Wpadded @gol -Wparentheses -Wno-pedantic-ms-format @gol -Wpointer-arith -Wno-pointer-compare -Wno-pointer-to-int-cast @gol +-Wno-poison-system-directories @gol -Wno-pragmas -Wno-prio-ctor-dtor -Wredundant-decls @gol -Wrestrict -Wno-return-local-addr -Wreturn-type @gol -Wno-scalar-storage-order -Wsequence-point @gol @@ -6926,6 +6927,14 @@ made up of data only and thus requires no special treatment. But, for most targets, it is made up of code and thus requires the stack to be made executable in order for the program to work properly. +@item -Wno-poison-system-directories +@opindex Wno-poison-system-directories +Do not warn for @option{-I} or @option{-L} options using system +directories such as @file{/usr/include} when cross compiling. This +option is intended for use in chroot environments when such +directories contain the correct headers and libraries for the target +system rather than the host. + @item -Wfloat-equal @opindex Wfloat-equal @opindex Wno-float-equal diff --git a/gcc/gcc.c b/gcc/gcc.c index 9f790db0daf..b2200c5185a 100644 --- a/gcc/gcc.c +++ b/gcc/gcc.c @@ -1041,6 +1041,8 @@ proper position among the other output files. */ "%{fuse-ld=*:-fuse-ld=%*} " LINK_COMPRESS_DEBUG_SPEC \ "%X %{o*} %{e*} %{N} %{n} %{r}\ %{s} %{t} %{u*} %{z} %{Z} %{!nostdlib:%{!r:%{!nostartfiles:%S}}} \ + %{Wno-poison-system-directories:--no-poison-system-directories} \ + %{Werror=poison-system-directories:--error-poison-system-directories} \ %{static|no-pie|static-pie:} %@{L*} %(mfwrap) %(link_libgcc) " \ VTABLE_VERIFICATION_SPEC " " SANITIZER_EARLY_SPEC " %o "" \ %{fopenacc|fopenmp|%:gt(%{ftree-parallelize-loops=*:%*} 1):\ diff --git a/gcc/incpath.c b/gcc/incpath.c index 8a2bda00f80..9098ab044ab 100644 --- a/gcc/incpath.c +++ b/gcc/incpath.c @@ -26,6 +26,7 @@ #include "intl.h" #include "incpath.h" #include "cppdefault.h" +#include "diagnostic-core.h" /* Microsoft Windows does not natively support inodes. VMS has non-numeric inodes. */ @@ -393,6 +394,26 @@ merge_include_chains (const char *sysroot, cpp_reader *pfile, int verbose) } fprintf (stderr, _("End of search list.\n")); } + +#ifdef ENABLE_POISON_SYSTEM_DIRECTORIES + if (flag_poison_system_directories) + { + struct cpp_dir *p; + + for (p = heads[INC_QUOTE]; p; p = p->next) + { + if ((!strncmp (p->name, "/usr/include", 12)) + || (!strncmp (p->name, "/usr/local/include", 18)) + || (!strncmp (p->name, "/usr/X11R6/include", 18)) + || (!strncmp (p->name, "/sw/include", 11)) + || (!strncmp (p->name, "/opt/include", 12))) + warning (OPT_Wpoison_system_directories, + "include location \"%s\" is unsafe for " + "cross-compilation", + p->name); + } + } +#endif } /* Use given -I paths for #include "..." but not #include <...>, and -- 2.29.2