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package/compiler-rt: new package

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This patch adds support for the compiler-rt (CLANG runtime) library.
It builds a set of static libraries and installs them into the
CLANG/LLVM toolchain resource folder. These libraries can then be
used by developers in the SDK for building target applications for
analysis.

What is fuzzing and why libfuzzer?
https://www.moritz.systems/blog/an-introduction-to-llvm-libfuzzer/

The compiler-rt fuzzer and address sanitizer tools require additional
LLVM binary tools installed to allow stack trace decoding actively during
executable analysis.  This patch conditionally enables these tools.
https://github.com/google/sanitizers/wiki/AddressSanitizerCallStack

Signed-off-by: Matt Weber <matthew.weber@rockwellcollins.com>
Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Cc: Romain Naour <romain.naour@smile.fr>
Cc: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Cc: Valentin Korenblit <valentinkorenblit@gmail.com>
Cc: Michael Drake <michael.drake@codethink.co.uk>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
This commit is contained in:
Matt Weber 2022-03-22 17:22:20 -06:00 committed by Arnout Vandecappelle (Essensium/Mind)
parent b19126c398
commit b1fcb596fe
6 changed files with 73 additions and 4 deletions
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1
DEVELOPERS
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@ -1903,6 +1903,7 @@ F: package/bridge-utils/
F: package/checkpolicy/
F: package/checksec/
F: package/cgroupfs-mount/
F: package/compiler-rt/
F: package/crda/
F: package/cunit/
F: package/dacapo/

1
package/Config.in
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@ -1934,6 +1934,7 @@ menu "Other"
source "package/cereal/Config.in"
source "package/clang/Config.in"
source "package/cmocka/Config.in"
source "package/compiler-rt/Config.in"
source "package/cppcms/Config.in"
source "package/cracklib/Config.in"
source "package/dawgdic/Config.in"

14
package/compiler-rt/Config.in Normal file
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@ -0,0 +1,14 @@
config BR2_PACKAGE_COMPILER_RT
bool "compiler-rt"
depends on BR2_PACKAGE_LLVM
depends on BR2_TOOLCHAIN_USES_GLIBC # asan lib requires
help
A collection of runtime libraries primarily used by clang and
llvm to provide builtins, sanitizer runtimes, and profiling
at runtime.
https://compiler-rt.llvm.org/
comment "compiler-rt requires llvm to be enabled and a glibc toolchain"
depends on !BR2_PACKAGE_LLVM
depends on !BR2_TOOLCHAIN_USES_GLIBC

3
package/compiler-rt/compiler-rt.hash Normal file
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@ -0,0 +1,3 @@
# Locally computed:
sha256 def1fc00c764cd3abbba925c712ac38860a756a43b696b291f46fee09e453274 compiler-rt-11.1.0.src.tar.xz
sha256 1a8f1058753f1ba890de984e48f0242a3a5c29a6a8f2ed9fd813f36985387e8d LICENSE.TXT

37
package/compiler-rt/compiler-rt.mk Normal file
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@ -0,0 +1,37 @@
################################################################################
#
# compiler-rt
#
################################################################################
# Compiler-RT should be bumped together with LLVM and Clang as the run-time is
# tied to the version of those tools
COMPILER_RT_VERSION = 11.1.0
COMPILER_RT_SOURCE = compiler-rt-$(COMPILER_RT_VERSION).src.tar.xz
COMPILER_RT_SITE = https://github.com/llvm/llvm-project/releases/download/llvmorg-$(COMPILER_RT_VERSION)
COMPILER_RT_LICENSE = NCSA MIT
COMPILER_RT_LICENSE_FILES = LICENSE.TXT
COMPILER_RT_DEPENDENCIES = host-clang llvm
COMPILER_RT_INSTALL_STAGING = YES
COMPILER_RT_INSTALL_TARGET = NO
COMPILER_RT_CONF_OPTS=-DCOMPILER_RT_STANDALONE_BUILD=OFF \
-DCOMPILER_RT_STANDALONE_BUILD=ON \
-DCOMPILER_RT_DEFAULT_TARGET_TRIPLE=$(GNU_TARGET_NAME) \
-DLLVM_CONFIG_PATH=$(HOST_DIR)/usr/bin/llvm-config
# The installation of the target runtime libraries defaults to DESTDIR, however
# host-clang resources directory needs a link so Clang can find the runtime
# libraries in the same location they would be if built as part of the Clang
# build. The "resources" directory is loosely documented and seems to be
# assumed, as compiler-rt is usually build at the same time as Clang and not
# standalone.
define COMPILER_RT_SETUP_RUNTIME_LIBS
mkdir -p $(HOST_DIR)/lib/clang/$(HOST_CLANG_VERSION)/lib
ln -sf ../../../../$(GNU_TARGET_NAME)/sysroot/usr/lib/linux $(HOST_DIR)/lib/clang/$(HOST_CLANG_VERSION)/lib/linux
ln -sf ../../../../$(GNU_TARGET_NAME)/sysroot/usr/share $(HOST_DIR)/lib/clang/$(HOST_CLANG_VERSION)/share
endef
COMPILER_RT_POST_INSTALL_STAGING_HOOKS += COMPILER_RT_SETUP_RUNTIME_LIBS
$(eval $(cmake-package))

21
package/llvm/llvm.mk
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@ -214,8 +214,7 @@ HOST_LLVM_CONF_OPTS += \
# We need to activate LLVM_INCLUDE_TOOLS, otherwise it does not generate
# libLLVM.so
LLVM_CONF_OPTS += \
-DLLVM_INCLUDE_TOOLS=ON \
-DLLVM_BUILD_TOOLS=OFF
-DLLVM_INCLUDE_TOOLS=ON
ifeq ($(BR2_PACKAGE_LLVM_RTTI),y)
HOST_LLVM_CONF_OPTS += -DLLVM_ENABLE_RTTI=ON
@ -278,11 +277,25 @@ LLVM_CONF_OPTS += \
# directories from STAGING_DIR.
# output/staging/usr/bin/llvm-config --includedir
# output/staging/usr/include
define HOST_LLVM_COPY_LLVM_CONFIG_TO_STAGING_DIR
define LLVM_COPY_LLVM_CONFIG_TO_STAGING_DIR
$(INSTALL) -D -m 0755 $(HOST_DIR)/bin/llvm-config \
$(STAGING_DIR)/usr/bin/llvm-config
endef
HOST_LLVM_POST_INSTALL_HOOKS = HOST_LLVM_COPY_LLVM_CONFIG_TO_STAGING_DIR
HOST_LLVM_POST_INSTALL_HOOKS = LLVM_COPY_LLVM_CONFIG_TO_STAGING_DIR
# The llvm-symbolizer binary is used by the Compiler-RT Fuzzer
# and AddressSanitizer tools on the target for stack traces.
# If we set -DLLVM_BUILD_TOOLS=ON this will also install the llvm-config
# target binary to STAGING_DIR, which means we can no longer run it.
# Therefore, overwrite it again with the host llvm-config.
ifeq ($(BR2_PACKAGE_COMPILER_RT),y)
LLVM_CONF_OPTS += \
-DLLVM_BUILD_TOOLS=ON
LLVM_POST_INSTALL_STAGING_HOOKS = LLVM_COPY_LLVM_CONFIG_TO_STAGING_DIR
else
LLVM_CONF_OPTS += \
-DLLVM_BUILD_TOOLS=OFF
endif
# By default llvm-tblgen is built and installed on the target but it is
# not necessary. Also erase LLVMHello.so from /usr/lib