From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965982AbcKOEPI (ORCPT ); Mon, 14 Nov 2016 23:15:08 -0500 Received: from szxga03-in.huawei.com ([119.145.14.66]:25264 "EHLO szxga03-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755295AbcKOEIP (ORCPT ); Mon, 14 Nov 2016 23:08:15 -0500 From: Wang Nan To: , CC: , , , , Wang Nan , Jiri Olsa Subject: [PATCH 11/34] tools build: Add feature detection for LLVM Date: Tue, 15 Nov 2016 04:05:54 +0000 Message-ID: <20161115040617.69788-12-wangnan0@huawei.com> X-Mailer: git-send-email 2.10.1 In-Reply-To: <20161115040617.69788-1-wangnan0@huawei.com> References: <20161115040617.69788-1-wangnan0@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.107.193.248] X-CFilter-Loop: Reflected 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: 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 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; +} -- 2.10.1