From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1034787AbcIZH2H (ORCPT ); Mon, 26 Sep 2016 03:28:07 -0400 Received: from szxga02-in.huawei.com ([119.145.14.65]:15755 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1761726AbcIZH2F (ORCPT ); Mon, 26 Sep 2016 03:28:05 -0400 From: Wang Nan To: , CC: , , , Wang Nan , Arnaldo Carvalho de Melo , Alexei Starovoitov , He Kuang , Jiri Olsa Subject: [PATCH v2 03/18] perf tools: Add feature detection for LLVM Date: Mon, 26 Sep 2016 07:26:57 +0000 Message-ID: <1474874832-134786-4-git-send-email-wangnan0@huawei.com> X-Mailer: git-send-email 1.8.3.4 In-Reply-To: <1474874832-134786-1-git-send-email-wangnan0@huawei.com> References: <1474874832-134786-1-git-send-email-wangnan0@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.107.193.248] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020205.57E8CDF0.00CE,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: 4832df3a9a557a8bdaca5694b5bbdf37 Sender: linux-kernel-owner@vger.kernel.org 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 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