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6b90bd4ba4
This patch allows to build the whole kernel with GCC plugins. It was ported from
grsecurity/PaX. The infrastructure supports building out-of-tree modules and
building in a separate directory. Cross-compilation is supported too.
Currently the x86, arm, arm64 and uml architectures enable plugins.
The directory of the gcc plugins is scripts/gcc-plugins. You can use a file or a directory
there. The plugins compile with these options:
* -fno-rtti: gcc is compiled with this option so the plugins must use it too
* -fno-exceptions: this is inherited from gcc too
* -fasynchronous-unwind-tables: this is inherited from gcc too
* -ggdb: it is useful for debugging a plugin (better backtrace on internal
errors)
* -Wno-narrowing: to suppress warnings from gcc headers (ipa-utils.h)
* -Wno-unused-variable: to suppress warnings from gcc headers (gcc_version
variable, plugin-version.h)
The infrastructure introduces a new Makefile target called gcc-plugins. It
supports all gcc versions from 4.5 to 6.0. The scripts/gcc-plugin.sh script
chooses the proper host compiler (gcc-4.7 can be built by either gcc or g++).
This script also checks the availability of the included headers in
scripts/gcc-plugins/gcc-common.h.
The gcc-common.h header contains frequently included headers for GCC plugins
and it has a compatibility layer for the supported gcc versions.
The gcc-generate-*-pass.h headers automatically generate the registration
structures for GIMPLE, SIMPLE_IPA, IPA and RTL passes.
Note that 'make clean' keeps the *.so files (only the distclean or mrproper
targets clean all) because they are needed for out-of-tree modules.
Based on work created by the PaX Team.
Signed-off-by: Emese Revfy <re.emese@gmail.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Michal Marek <mmarek@suse.com>
52 lines
853 B
Bash
Executable File
52 lines
853 B
Bash
Executable File
#!/bin/sh
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srctree=$(dirname "$0")
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gccplugins_dir=$($3 -print-file-name=plugin)
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plugincc=$($1 -E -x c++ - -o /dev/null -I"${srctree}"/gcc-plugins -I"${gccplugins_dir}"/include 2>&1 <<EOF
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#include "gcc-common.h"
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#if BUILDING_GCC_VERSION >= 4008 || defined(ENABLE_BUILD_WITH_CXX)
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#warning $2 CXX
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#else
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#warning $1 CC
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#endif
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EOF
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)
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if [ $? -ne 0 ]
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then
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exit 1
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fi
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case "$plugincc" in
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*"$1 CC"*)
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echo "$1"
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exit 0
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;;
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*"$2 CXX"*)
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# the c++ compiler needs another test, see below
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;;
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*)
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exit 1
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;;
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esac
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# we need a c++ compiler that supports the designated initializer GNU extension
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plugincc=$($2 -c -x c++ -std=gnu++98 - -fsyntax-only -I"${srctree}"/gcc-plugins -I"${gccplugins_dir}"/include 2>&1 <<EOF
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#include "gcc-common.h"
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class test {
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public:
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int test;
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} test = {
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.test = 1
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};
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EOF
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)
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if [ $? -eq 0 ]
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then
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echo "$2"
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exit 0
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fi
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exit 1
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