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[PATCH 04/14] perf tools: Add feature detection for clang

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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: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
---
 tools/build/feature/Makefile       | 10 ++++++++++
 tools/build/feature/test-clang.cpp | 21 +++++++++++++++++++++
 2 files changed, 31 insertions(+)
 create mode 100644 tools/build/feature/test-clang.cpp

diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile
index fd2f3e2..0af90dd 100644
--- a/tools/build/feature/Makefile
+++ b/tools/build/feature/Makefile
@@ -233,6 +233,16 @@ $(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
 
 ###############################
diff --git a/tools/build/feature/test-clang.cpp b/tools/build/feature/test-clang.cpp
new file mode 100644
index 0000000..1c6ad41
--- /dev/null
+++ b/tools/build/feature/test-clang.cpp
@@ -0,0 +1,21 @@
+#include "clang/Driver/Driver.h"
+#include "clang/Basic/VirtualFileSystem.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;
+}
-- 
1.8.3.4

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[PATCH 00/14] perf clang: Support compiling BPF script use builtin clang Wang Nan <wangnan0@huawei.com> - 2016-09-23 15:00 +0200
  [PATCH 03/14] perf tools: Add feature detection for LLVM Wang Nan <wangnan0@huawei.com> - 2016-09-23 15:00 +0200
  [PATCH 01/14] tools build: Support compiling C++ source file Wang Nan <wangnan0@huawei.com> - 2016-09-23 15:00 +0200
    Re: [PATCH 01/14] tools build: Support compiling C++ source file Jiri Olsa <jolsa@redhat.com> - 2016-09-28 16:40 +0200
  [PATCH 04/14] perf tools: Add feature detection for clang Wang Nan <wangnan0@huawei.com> - 2016-09-23 15:00 +0200
  [PATCH 09/14] perf clang: Update test case to use real BPF script Wang Nan <wangnan0@huawei.com> - 2016-09-23 15:00 +0200
  [PATCH 08/14] perf clang: Allow passing CFLAGS to builtin clang Wang Nan <wangnan0@huawei.com> - 2016-09-23 15:00 +0200
  [PATCH 13/14] perf clang: Pass fill path compiler Wang Nan <wangnan0@huawei.com> - 2016-09-23 15:00 +0200
  [PATCH 12/14] perf bpf: Compile BPF script use builtin cflags support Wang Nan <wangnan0@huawei.com> - 2016-09-23 15:00 +0200
  [PATCH 02/14] perf tools: Add feature detection for g++ Wang Nan <wangnan0@huawei.com> - 2016-09-23 15:00 +0200
  [PATCH 11/14] perf tools: Extract kernel build option detector as utils Wang Nan <wangnan0@huawei.com> - 2016-09-23 15:00 +0200
  [PATCH 06/14] perf clang: Add builtin clang support ant test case Wang Nan <wangnan0@huawei.com> - 2016-09-23 15:00 +0200
  [PATCH 05/14] perf build: Add clang and llvm compile and linking support Wang Nan <wangnan0@huawei.com> - 2016-09-23 15:00 +0200
  [PATCH 07/14] perf clang: Use real file system for #include Wang Nan <wangnan0@huawei.com> - 2016-09-23 15:00 +0200
  [PATCH 14/14] perf clang: Pass correct CFLAGS to builtin clang Wang Nan <wangnan0@huawei.com> - 2016-09-23 15:00 +0200
  [PATCH 10/14] perf clang: Support compile IR to BPF object and add testcase Wang Nan <wangnan0@huawei.com> - 2016-09-23 15:00 +0200
  Re: [PATCH 00/14] perf clang: Support compiling BPF script use  builtin clang Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2016-09-24 17:20 +0200
    Re: [PATCH 00/14] perf clang: Support compiling BPF script use  builtin clang "Wangnan (F)" <wangnan0@huawei.com> - 2016-09-26 04:00 +0200
      Re: [PATCH 00/14] perf clang: Support compiling BPF script use  builtin clang Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2016-09-27 01:50 +0200
        Re: [PATCH 00/14] perf clang: Support compiling BPF script use  builtin clang "Wangnan (F)" <wangnan0@huawei.com> - 2016-09-27 04:00 +0200

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