Commit cb40d55b authored Nov 26, 2016 by Wang Nan Committed by Arnaldo Carvalho de Melo Dec 05, 2016

tools build: Add feature detection for LLVM



Check if basic LLVM compiling environment is ready.

Use llvm-config to detect include and library directories. Avoid using
'llvm-config --cxxflags' because its result contain some unwanted flags
like --sysroot (if LLVM is built by yocto).

Use '?=' to set LLVM_CONFIG, so explicitly passing LLVM_CONFIG to make
would override it.

Use 'llvm-config --libs BPF' to check if BPF backend is compiled in.
Since now BPF bytecode is the only required backend, no need to waste
time linking llvm and clang if BPF backend is missing. This also
introduce an implicit requirement that LLVM should be new enough.  Old
LLVM doesn't support BPF backend.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Joe Stringer <joe@ovn.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/20161126070354.141764-8-wangnan0@huawei.com


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

parent 2bd42de0

tools/build/feature/Makefile

+8 −0

Original line number	Diff line number	Diff line
		@@ -55,6 +55,7 @@ FILES := $(addprefix $(OUTPUT),$(FILES))
		CC := $(CROSS_COMPILE)gcc -MD
		CXX := $(CROSS_COMPILE)g++ -MD
		PKG_CONFIG := $(CROSS_COMPILE)pkg-config
		LLVM_CONFIG ?= llvm-config

		all: $(FILES)

		@@ -229,6 +230,13 @@ $(OUTPUT)test-cxx.bin:
		$(OUTPUT)test-jvmti.bin:
		$(BUILD)

		$(OUTPUT)test-llvm.bin:
		$(BUILDXX) -std=gnu++11 \
		-I$(shell $(LLVM_CONFIG) --includedir) \
		-L$(shell $(LLVM_CONFIG) --libdir) \
		$(shell $(LLVM_CONFIG) --libs Core BPF) \
		$(shell $(LLVM_CONFIG) --system-libs)

		-include $(OUTPUT)*.d

		###############################

tools/build/feature/test-llvm.cpp

0 → 100644

+8 −0

Original line number	Diff line number	Diff line
		#include "llvm/Support/ManagedStatic.h"
		#include "llvm/Support/raw_ostream.h"
		int main()
		{
		llvm::errs() << "Hello World!\n";
		llvm::llvm_shutdown();
		return 0;
		}

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