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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 03/18] perf tools: Add feature detection for LLVM
Date: Mon, 26 Sep 2016 07:26:57 +0000	[thread overview]
Message-ID: <1474874832-134786-4-git-send-email-wangnan0@huawei.com> (raw)
In-Reply-To: <1474874832-134786-1-git-send-email-wangnan0@huawei.com>

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: 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      | 8 ++++++++
 tools/build/feature/test-llvm.cpp | 8 ++++++++
 2 files changed, 16 insertions(+)
 create mode 100644 tools/build/feature/test-llvm.cpp

diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile
index ac9c477..fd2f3e2 100644
--- a/tools/build/feature/Makefile
+++ b/tools/build/feature/Makefile
@@ -54,6 +54,7 @@ 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)
 
@@ -225,6 +226,13 @@ $(OUTPUT)test-sdt.bin:
 $(OUTPUT)test-cxx.bin:
 	$(BUILDXX) -std=gnu++11
 
+$(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
 
 ###############################
diff --git a/tools/build/feature/test-llvm.cpp b/tools/build/feature/test-llvm.cpp
new file mode 100644
index 0000000..d8d2cee
--- /dev/null
+++ b/tools/build/feature/test-llvm.cpp
@@ -0,0 +1,8 @@
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/raw_ostream.h"
+int main()
+{
+	llvm::errs() << "Hello World!\n";
+	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 ` Wang Nan [this message]
2016-09-26  7:26 ` [PATCH v2 04/18] perf tools: Add feature detection for clang Wang Nan
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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