737cff798a
Based on the last version from Alpine, but installed to /usr/gcc6 and with pretty much everything disabled except for the C compiler. We can probably throw out a lot of patches, and make the APKBUILD much smaller. But let's focus on making it possible to compile old kernels again first. There's still a lot to do for that, see #103.
194 lines
6.8 KiB
Diff
194 lines
6.8 KiB
Diff
http://cgit.openembedded.org/openembedded-core/plain/meta/recipes-devtools/gcc/gcc-6.1/0010-gcc-poison-system-directories.patch
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From d76250323dad69212c958e4857a98d99ab51a39e Mon Sep 17 00:00:00 2001
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From: Khem Raj <raj.khem@gmail.com>
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Date: Fri, 29 Mar 2013 08:59:00 +0400
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Subject: [PATCH 10/46] gcc: poison-system-directories
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Signed-off-by: Khem Raj <raj.khem@gmail.com>
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Upstream-Status: Inappropriate [distribution: codesourcery]
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---
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gcc/common.opt | 4 ++++
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gcc/config.in | 6 ++++++
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gcc/configure | 16 ++++++++++++++++
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gcc/configure.ac | 10 ++++++++++
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gcc/doc/invoke.texi | 9 +++++++++
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gcc/gcc.c | 2 ++
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gcc/incpath.c | 19 +++++++++++++++++++
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7 files changed, 66 insertions(+)
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diff --git a/gcc/common.opt b/gcc/common.opt
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index 67048db..733185c 100644
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--- a/gcc/common.opt
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+++ b/gcc/common.opt
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@@ -659,6 +659,10 @@ Wreturn-local-addr
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Common Var(warn_return_local_addr) Init(1) Warning
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Warn about returning a pointer/reference to a local or temporary variable.
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+Wpoison-system-directories
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+Common Var(flag_poison_system_directories) Init(1) Warning
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+Warn for -I and -L options using system directories if cross compiling
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+
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Wshadow
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Common Var(warn_shadow) Warning
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Warn when one local variable shadows another.
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diff --git a/gcc/config.in b/gcc/config.in
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index 115cb61..105b30f 100644
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--- a/gcc/config.in
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+++ b/gcc/config.in
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@@ -187,6 +187,12 @@
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#endif
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+/* Define to warn for use of native system header directories */
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+#ifndef USED_FOR_TARGET
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+#undef ENABLE_POISON_SYSTEM_DIRECTORIES
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+#endif
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+
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+
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/* Define if you want all operations on RTL (the basic data structure of the
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optimizer and back end) to be checked for dynamic type safety at runtime.
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This is quite expensive. */
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diff --git a/gcc/configure b/gcc/configure
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index 1c6e340..8f83152 100755
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--- a/gcc/configure
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+++ b/gcc/configure
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@@ -942,6 +942,7 @@ with_system_zlib
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enable_maintainer_mode
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enable_link_mutex
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enable_version_specific_runtime_libs
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+enable_poison_system_directories
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enable_plugin
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enable_host_shared
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enable_libquadmath_support
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@@ -1681,6 +1682,8 @@ Optional Features:
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--enable-version-specific-runtime-libs
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specify that runtime libraries should be installed
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in a compiler-specific directory
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+ --enable-poison-system-directories
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+ warn for use of native system header directories
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--enable-plugin enable plugin support
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--enable-host-shared build host code as shared libraries
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--disable-libquadmath-support
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@@ -28908,6 +28911,19 @@ if test "${enable_version_specific_runtime_libs+set}" = set; then :
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fi
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+# Check whether --enable-poison-system-directories was given.
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+if test "${enable_poison_system_directories+set}" = set; then :
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+ enableval=$enable_poison_system_directories;
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+else
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+ enable_poison_system_directories=no
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+fi
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+
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+if test "x${enable_poison_system_directories}" = "xyes"; then
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+
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+$as_echo "#define ENABLE_POISON_SYSTEM_DIRECTORIES 1" >>confdefs.h
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+
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+fi
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+
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# Substitute configuration variables
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diff --git a/gcc/configure.ac b/gcc/configure.ac
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index 6c1dcd9..0fccaef 100644
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--- a/gcc/configure.ac
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+++ b/gcc/configure.ac
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@@ -5861,6 +5861,16 @@ AC_ARG_ENABLE(version-specific-runtime-libs,
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[specify that runtime libraries should be
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installed in a compiler-specific directory])])
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+AC_ARG_ENABLE([poison-system-directories],
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+ AS_HELP_STRING([--enable-poison-system-directories],
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+ [warn for use of native system header directories]),,
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+ [enable_poison_system_directories=no])
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+if test "x${enable_poison_system_directories}" = "xyes"; then
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+ AC_DEFINE([ENABLE_POISON_SYSTEM_DIRECTORIES],
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+ [1],
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+ [Define to warn for use of native system header directories])
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+fi
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+
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# Substitute configuration variables
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AC_SUBST(subdirs)
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AC_SUBST(srcdir)
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diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
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index 821f8fd..8bb49e7 100644
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--- a/gcc/doc/invoke.texi
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+++ b/gcc/doc/invoke.texi
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@@ -284,6 +284,7 @@ Objective-C and Objective-C++ Dialects}.
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-Wparentheses -Wno-pedantic-ms-format @gol
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-Wplacement-new -Wplacement-new=@var{n} @gol
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-Wpointer-arith -Wno-pointer-to-int-cast @gol
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+-Wno-poison-system-directories @gol
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-Wno-pragmas -Wredundant-decls -Wno-return-local-addr @gol
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-Wreturn-type -Wsequence-point -Wshadow -Wno-shadow-ivar @gol
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-Wshift-overflow -Wshift-overflow=@var{n} @gol
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@@ -4723,6 +4724,14 @@ made up of data only and thus requires no special treatment. But, for
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most targets, it is made up of code and thus requires the stack to be
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made executable in order for the program to work properly.
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+@item -Wno-poison-system-directories
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+@opindex Wno-poison-system-directories
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+Do not warn for @option{-I} or @option{-L} options using system
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+directories such as @file{/usr/include} when cross compiling. This
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+option is intended for use in chroot environments when such
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+directories contain the correct headers and libraries for the target
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+system rather than the host.
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+
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@item -Wfloat-equal
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@opindex Wfloat-equal
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@opindex Wno-float-equal
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diff --git a/gcc/gcc.c b/gcc/gcc.c
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index 1af5920..4cfef7f 100644
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--- a/gcc/gcc.c
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+++ b/gcc/gcc.c
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@@ -1017,6 +1017,8 @@ proper position among the other output files. */
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"%{fuse-ld=*:-fuse-ld=%*} " LINK_COMPRESS_DEBUG_SPEC \
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"%X %{o*} %{e*} %{N} %{n} %{r}\
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%{s} %{t} %{u*} %{z} %{Z} %{!nostdlib:%{!nostartfiles:%S}} \
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+ %{Wno-poison-system-directories:--no-poison-system-directories} \
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+ %{Werror=poison-system-directories:--error-poison-system-directories} \
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%{static:} %{L*} %(mfwrap) %(link_libgcc) " \
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VTABLE_VERIFICATION_SPEC " " SANITIZER_EARLY_SPEC " %o " CHKP_SPEC " \
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%{fopenacc|fopenmp|%:gt(%{ftree-parallelize-loops=*:%*} 1):\
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diff --git a/gcc/incpath.c b/gcc/incpath.c
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index ea40f4a..856da41 100644
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--- a/gcc/incpath.c
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+++ b/gcc/incpath.c
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@@ -26,6 +26,7 @@
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#include "intl.h"
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#include "incpath.h"
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#include "cppdefault.h"
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+#include "diagnostic-core.h"
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/* Microsoft Windows does not natively support inodes.
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VMS has non-numeric inodes. */
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@@ -381,6 +382,24 @@ merge_include_chains (const char *sysroot, cpp_reader *pfile, int verbose)
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}
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fprintf (stderr, _("End of search list.\n"));
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}
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+
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+#ifdef ENABLE_POISON_SYSTEM_DIRECTORIES
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+ if (flag_poison_system_directories)
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+ {
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+ struct cpp_dir *p;
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+
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+ for (p = heads[QUOTE]; p; p = p->next)
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+ {
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+ if ((!strncmp (p->name, "/usr/include", 12))
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+ || (!strncmp (p->name, "/usr/local/include", 18))
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+ || (!strncmp (p->name, "/usr/X11R6/include", 18)))
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+ warning (OPT_Wpoison_system_directories,
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+ "include location \"%s\" is unsafe for "
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+ "cross-compilation",
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+ p->name);
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+ }
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+ }
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+#endif
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}
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/* Use given -I paths for #include "..." but not #include <...>, and
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--
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2.8.2
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