tools build: Add feature detection for clang (c7fb4f62) · Commits · 戴 / test

Check if basic clang compiling environment is ready. Doesn't like 'llvm-config --libs' which can returns llvm libraries in right order and duplicates some libraries if necessary, there's no correspondence for clang libraries (-lclangxxx). to avoid extra complexity and to avoid new clang breaking libraries ordering, use --start-group and --end-group. In this test case, manually identify required clang libs and hope it to be stable. Putting all clang libraries here is possible (use make's wildcard), but then feature checking becomes very slow. 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/20161126070354.141764-9-wangnan0@huawei.com Signed-off-by:

Arnaldo Carvalho de Melo <acme@redhat.com>

tools/build/feature/Makefile

+10 −0

Original line number	Diff line number	Diff line
		@@ -237,6 +237,16 @@ $(OUTPUT)test-llvm.bin:
		$(shell $(LLVM_CONFIG) --libs Core BPF) \
		$(shell $(LLVM_CONFIG) --system-libs)

		$(OUTPUT)test-clang.bin:
		$(BUILDXX) -std=gnu++11 \
		-I$(shell $(LLVM_CONFIG) --includedir) \
		-L$(shell $(LLVM_CONFIG) --libdir) \
		-Wl,--start-group -lclangBasic -lclangDriver \
		-lclangFrontend -lclangEdit -lclangLex \
		-lclangAST -Wl,--end-group \
		$(shell $(LLVM_CONFIG) --libs Core option) \
		$(shell $(LLVM_CONFIG) --system-libs)

		-include $(OUTPUT)*.d

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

tools/build/feature/test-clang.cpp

0 → 100644

+21 −0

Original line number	Diff line number	Diff line
		#include "clang/Basic/VirtualFileSystem.h"
		#include "clang/Driver/Driver.h"
		#include "clang/Frontend/TextDiagnosticPrinter.h"
		#include "llvm/ADT/IntrusiveRefCntPtr.h"
		#include "llvm/Support/ManagedStatic.h"
		#include "llvm/Support/raw_ostream.h"

		using namespace clang;
		using namespace clang::driver;

		int main()
		{
		IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
		IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();

		DiagnosticsEngine Diags(DiagID, &*DiagOpts);
		Driver TheDriver("test", "bpf-pc-linux", Diags);

		llvm::llvm_shutdown();
		return 0;
		}

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