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>
116 lines
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116 lines
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#
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# NOTE! Don't add files that are generated in specific
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# subdirectories here. Add them in the ".gitignore" file
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# in that subdirectory instead.
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#
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# NOTE! Please use 'git ls-files -i --exclude-standard'
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# command after changing this file, to see if there are
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# any tracked files which get ignored after the change.
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#
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# Normal rules
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#
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.*
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*.o
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*.o.*
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*.a
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*.s
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*.ko
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*.so
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*.so.dbg
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*.mod.c
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*.i
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*.lst
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*.symtypes
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*.order
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*.elf
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*.bin
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*.tar
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*.gz
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*.bz2
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*.lzma
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*.xz
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*.lz4
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*.lzo
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*.patch
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*.gcno
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modules.builtin
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Module.symvers
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*.dwo
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*.su
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*.c.[012]*.*
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#
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# Top-level generic files
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#
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/tags
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/TAGS
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/linux
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/vmlinux
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/vmlinux.32
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/vmlinux-gdb.py
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/vmlinuz
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/System.map
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/Module.markers
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#
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# Debian directory (make deb-pkg)
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#
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/debian/
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#
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# tar directory (make tar*-pkg)
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#
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/tar-install/
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#
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# git files that we don't want to ignore even if they are dot-files
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#
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!.gitignore
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!.mailmap
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#
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# Generated include files
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#
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include/config
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include/generated
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arch/*/include/generated
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# stgit generated dirs
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patches-*
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# quilt's files
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patches
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series
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# cscope files
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cscope.*
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ncscope.*
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# gnu global files
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GPATH
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GRTAGS
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GSYMS
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GTAGS
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# id-utils files
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ID
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*.orig
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*~
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\#*#
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#
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# Leavings from module signing
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#
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extra_certificates
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signing_key.pem
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signing_key.priv
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signing_key.x509
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x509.genkey
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# Kconfig presets
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all.config
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# Kdevelop4
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*.kdev4
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