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From: Wang Nan <wangnan0@huawei.com>
To: <acme@kernel.org>, <alexei.starovoitov@gmail.com>
Cc: <lizefan@huawei.com>, <linux-kernel@vger.kernel.org>,
	<pi3orama@163.com>, Wang Nan <wangnan0@huawei.com>,
	Arnaldo Carvalho de Melo <acme@redhat.com>,
	Alexei Starovoitov <ast@fb.com>, He Kuang <hekuang@huawei.com>,
	Jiri Olsa <jolsa@kernel.org>
Subject: [PATCH v2 04/18] perf tools: Add feature detection for clang
Date: Mon, 26 Sep 2016 07:26:58 +0000	[thread overview]
Message-ID: <1474874832-134786-5-git-send-email-wangnan0@huawei.com> (raw)
In-Reply-To: <1474874832-134786-1-git-send-email-wangnan0@huawei.com>

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..e23c1b1
--- /dev/null
+++ b/tools/build/feature/test-clang.cpp
@@ -0,0 +1,21 @@
+#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;
+}
-- 
1.8.3.4

  parent reply	other threads:[~2016-09-26  7:28 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-09-26  7:26 [PATCH v2 00/18] perf clang: Support compiling BPF script on the fly Wang Nan
2016-09-26  7:26 ` [PATCH v2 01/18] tools build: Support compiling C++ source file Wang Nan
2016-10-06 22:44   ` [tip:perf/urgent] " tip-bot for Wang Nan
2016-09-26  7:26 ` [PATCH v2 02/18] perf tools: Add feature detection for g++ Wang Nan
2016-10-06 22:45   ` [tip:perf/urgent] tools build: " tip-bot for Wang Nan
2016-09-26  7:26 ` [PATCH v2 03/18] perf tools: Add feature detection for LLVM Wang Nan
2016-09-26  7:26 ` Wang Nan [this message]
2016-09-26  7:26 ` [PATCH v2 05/18] perf build: Add clang and llvm compile and linking support Wang Nan
2016-09-26  7:27 ` [PATCH v2 06/18] perf clang: Add builtin clang support ant test case Wang Nan
2016-09-26  7:27 ` [PATCH v2 07/18] perf clang: Use real file system for #include Wang Nan
2016-09-26  7:27 ` [PATCH v2 08/18] perf clang: Allow passing CFLAGS to builtin clang Wang Nan
2016-09-26  7:27 ` [PATCH v2 09/18] perf clang: Update test case to use real BPF script Wang Nan
2016-09-26  7:27 ` [PATCH v2 10/18] perf clang: Support compile IR to BPF object and add testcase Wang Nan
2016-09-26  7:27 ` [PATCH v2 11/18] perf tools: Extract helpers in llvm-utils.c Wang Nan
2016-09-26  7:27 ` [PATCH v2 12/18] perf bpf: Compile BPF script use builtin clang support Wang Nan
2016-09-26  7:27 ` [PATCH v2 13/18] perf clang: Pass full path to builtin clang Wang Nan
2016-09-26  7:27 ` [PATCH v2 14/18] perf clang: Pass CFLAGS " Wang Nan
2016-09-26  7:27 ` [PATCH v2 15/18] perf clang: Link BPF functions declaration into perf Wang Nan
2016-09-26  7:27 ` [PATCH v2 16/18] perf clang: Declare BPF functions for BPF scripts automatically Wang Nan
2016-09-26  7:27 ` [PATCH v2 17/18] perf clang: Include helpers to BPF scripts Wang Nan
2016-09-26  7:27 ` [PATCH v2 18/18] perf clang: Define PERF_BUILTIN_CLANG for builtin clang compiling Wang Nan
2016-10-05 23:20 ` [PATCH v2 00/18] perf clang: Support compiling BPF script on the fly Arnaldo Carvalho de Melo
2016-10-08  2:03   ` Wangnan (F)

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