From patchwork Fri Sep 23 12:49:50 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wang Nan X-Patchwork-Id: 76860 Delivered-To: patch@linaro.org Received: by 10.140.106.72 with SMTP id d66csp553567qgf; Fri, 23 Sep 2016 05:54:00 -0700 (PDT) X-Received: by 10.66.26.77 with SMTP id j13mr12238828pag.129.1474635240845; Fri, 23 Sep 2016 05:54:00 -0700 (PDT) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id jh9si7873966pac.81.2016.09.23.05.54.00; Fri, 23 Sep 2016 05:54:00 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759838AbcIWMx6 (ORCPT + 27 others); Fri, 23 Sep 2016 08:53:58 -0400 Received: from szxga01-in.huawei.com ([58.251.152.64]:18931 "EHLO szxga01-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758832AbcIWMuv (ORCPT ); Fri, 23 Sep 2016 08:50:51 -0400 Received: from 172.24.1.136 (EHLO szxeml431-hub.china.huawei.com) ([172.24.1.136]) by szxrg01-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id DRL70262; Fri, 23 Sep 2016 20:50:19 +0800 (CST) Received: from linux-4hy3.site (10.107.193.248) by szxeml431-hub.china.huawei.com (10.82.67.208) with Microsoft SMTP Server id 14.3.235.1; Fri, 23 Sep 2016 20:50:08 +0800 From: Wang Nan To: , CC: , , , Wang Nan , Arnaldo Carvalho de Melo , He Kuang , Jiri Olsa Subject: [PATCH 03/14] perf tools: Add feature detection for LLVM Date: Fri, 23 Sep 2016 12:49:50 +0000 Message-ID: <1474635001-153850-4-git-send-email-wangnan0@huawei.com> X-Mailer: git-send-email 1.8.3.4 In-Reply-To: <1474635001-153850-1-git-send-email-wangnan0@huawei.com> References: <1474635001-153850-1-git-send-email-wangnan0@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.107.193.248] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A0B0203.57E5250B.019B, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: f884c7bb8cb0b75f55c4b0c88b16272e Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 Cc: Arnaldo Carvalho de Melo Cc: Alexei Starovoitov Cc: He Kuang Cc: Jiri Olsa --- 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 -- 1.8.3.4 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; +}