OpenCloudOS-Kernel/tools/build/feature/test-llvm.cpp

#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/raw_ostream.h"
int main()
{
	llvm::errs() << "Hello World!\n";
	llvm::llvm_shutdown();
	return 0;
}
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> 2016-11-26 15:03:31 +08:00			`#include "llvm/Support/ManagedStatic.h"`
			`#include "llvm/Support/raw_ostream.h"`
			`int main()`
			`{`
			`llvm::errs() << "Hello World!\n";`
			`llvm::llvm_shutdown();`
			`return 0;`
			`}`