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Records the commands for cross compilation with two methods. The first method relies on Multiarch. The second approach is to explicitly specify the PKG_CONFIG variables, which is widely used in build system (like Buildroot, Yocto, etc). Co-developed-by: James Clark <james.clark@arm.com> Signed-off-by: James Clark <james.clark@arm.com> Signed-off-by: Leo Yan <leo.yan@arm.com> Tested-by: Ian Rogers <irogers@google.com> Cc: amadio@gentoo.org Cc: Thomas Richter <tmricht@linux.ibm.com> Link: https://lore.kernel.org/r/20240717082211.524826-7-leo.yan@arm.com Signed-off-by: Namhyung Kim <namhyung@kernel.org>
102 lines
3.2 KiB
Plaintext
102 lines
3.2 KiB
Plaintext
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1) perf build
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=============
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The perf build process consists of several separated building blocks,
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which are linked together to form the perf binary:
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- libperf library (static)
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- perf builtin commands
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- traceevent library (static)
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- GTK ui library
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Several makefiles govern the perf build:
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- Makefile
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top level Makefile working as a wrapper that calls the main
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Makefile.perf with a -j option to do parallel builds.
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- Makefile.perf
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main makefile that triggers build of all perf objects including
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installation and documentation processing.
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- tools/build/Makefile.build
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main makefile of the build framework
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- tools/build/Build.include
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build framework generic definitions
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- Build makefiles
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makefiles that defines build objects
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Please refer to tools/build/Documentation/Build.txt for more
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information about build framework.
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2) perf build
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=============
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The Makefile.perf triggers the build framework for build objects:
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perf, libperf, gtk
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resulting in following objects:
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$ ls *-in.o
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gtk-in.o libperf-in.o perf-in.o
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Those objects are then used in final linking:
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libperf-gtk.so <- gtk-in.o libperf-in.o
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perf <- perf-in.o libperf-in.o
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NOTE this description is omitting other libraries involved, only
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focusing on build framework outcomes
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3) Build with ASan or UBSan
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==========================
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$ cd tools/perf
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$ make DESTDIR=/usr
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$ make DESTDIR=/usr install
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AddressSanitizer (or ASan) is a GCC feature that detects memory corruption bugs
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such as buffer overflows and memory leaks.
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$ cd tools/perf
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$ make DEBUG=1 EXTRA_CFLAGS='-fno-omit-frame-pointer -fsanitize=address'
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$ ASAN_OPTIONS=log_path=asan.log ./perf record -a
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ASan outputs all detected issues into a log file named 'asan.log.<pid>'.
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UndefinedBehaviorSanitizer (or UBSan) is a fast undefined behavior detector
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supported by GCC. UBSan detects undefined behaviors of programs at runtime.
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$ cd tools/perf
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$ make DEBUG=1 EXTRA_CFLAGS='-fno-omit-frame-pointer -fsanitize=undefined'
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$ UBSAN_OPTIONS=print_stacktrace=1 ./perf record -a
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If UBSan detects any problem at runtime, it outputs a “runtime error:” message.
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4) Cross compilation
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====================
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As Multiarch is commonly supported in Linux distributions, we can install
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libraries for multiple architectures on the same system and then cross-compile
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Linux perf. For example, Aarch64 libraries and toolchains can be installed on
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an x86_64 machine, allowing us to compile perf for an Aarch64 target.
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Below is the command for building the perf with dynamic linking.
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$ cd /path/to/Linux
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$ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- -C tools/perf
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For static linking, the option `LDFLAGS="-static"` is required.
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$ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- \
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LDFLAGS="-static" -C tools/perf
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In the embedded system world, a use case is to explicitly specify the package
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configuration paths for cross building:
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$ PKG_CONFIG_SYSROOT_DIR="/path/to/cross/build/sysroot" \
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PKG_CONFIG_LIBDIR="/usr/lib/:/usr/local/lib" \
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make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- -C tools/perf
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In this case, the variable PKG_CONFIG_SYSROOT_DIR can be used alongside the
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variable PKG_CONFIG_LIBDIR or PKG_CONFIG_PATH to prepend the sysroot path to
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the library paths for cross compilation.
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