From patchwork Sat Nov 26 07:03:31 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wang Nan X-Patchwork-Id: 84230 Delivered-To: patch@linaro.org Received: by 10.140.20.101 with SMTP id 92csp386108qgi; Fri, 25 Nov 2016 23:07:19 -0800 (PST) X-Received: by 10.84.175.234 with SMTP id t97mr25972130plb.145.1480144039357; Fri, 25 Nov 2016 23:07:19 -0800 (PST) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id f16si47864132pga.83.2016.11.25.23.07.18; Fri, 25 Nov 2016 23:07:19 -0800 (PST) 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 S1751712AbcKZHHN (ORCPT + 25 others); Sat, 26 Nov 2016 02:07:13 -0500 Received: from szxga01-in.huawei.com ([58.251.152.64]:59658 "EHLO szxga01-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751082AbcKZHGy (ORCPT ); Sat, 26 Nov 2016 02:06:54 -0500 Received: from 172.24.1.36 (EHLO szxeml431-hub.china.huawei.com) ([172.24.1.36]) by szxrg01-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id DVS32986; Sat, 26 Nov 2016 15:06:16 +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; Sat, 26 Nov 2016 15:06:04 +0800 From: Wang Nan To: , CC: , , , , , Wang Nan , Jiri Olsa Subject: [PATCH v3 07/30] tools build: Add feature detection for LLVM Date: Sat, 26 Nov 2016 07:03:31 +0000 Message-ID: <20161126070354.141764-8-wangnan0@huawei.com> X-Mailer: git-send-email 2.10.1 In-Reply-To: <20161126070354.141764-1-wangnan0@huawei.com> References: <20161126070354.141764-1-wangnan0@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.107.193.248] X-CFilter-Loop: Reflected 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: Alexei Starovoitov Cc: He Kuang Cc: Jiri Olsa Cc: Zefan Li Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/1474874832-134786-4-git-send-email-wangnan0@huawei.com Signed-off-by: Arnaldo Carvalho de Melo --- 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 -- 2.10.1 diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile index 8f668bc..c09de59 100644 --- a/tools/build/feature/Makefile +++ b/tools/build/feature/Makefile @@ -55,6 +55,7 @@ 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) @@ -229,6 +230,13 @@ $(OUTPUT)test-cxx.bin: $(OUTPUT)test-jvmti.bin: $(BUILD) +$(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; +}