From patchwork Tue Jul 19 17:05:52 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roberto Sassu X-Patchwork-Id: 12922742 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C5F13C43334 for ; Tue, 19 Jul 2022 17:06:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237587AbiGSRGW (ORCPT ); Tue, 19 Jul 2022 13:06:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59336 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235892AbiGSRGV (ORCPT ); Tue, 19 Jul 2022 13:06:21 -0400 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BB4724D817; Tue, 19 Jul 2022 10:06:20 -0700 (PDT) Received: from fraeml714-chm.china.huawei.com (unknown [172.18.147.207]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4LnQBR2z29z689Mf; Wed, 20 Jul 2022 01:02:55 +0800 (CST) Received: from roberto-ThinkStation-P620.huawei.com (10.204.63.22) by fraeml714-chm.china.huawei.com (10.206.15.33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Tue, 19 Jul 2022 19:06:17 +0200 From: Roberto Sassu To: , , , , , , , , , , , , , , CC: , , , , Roberto Sassu Subject: [PATCH 1/4] tools, build: Retry detection of bfd-related features Date: Tue, 19 Jul 2022 19:05:52 +0200 Message-ID: <20220719170555.2576993-1-roberto.sassu@huawei.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Originating-IP: [10.204.63.22] X-ClientProxiedBy: lhreml754-chm.china.huawei.com (10.201.108.204) To fraeml714-chm.china.huawei.com (10.206.15.33) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org While separate features have been defined to determine which linking flags are required to use libbfd depending on the distribution (libbfd, libbfd-liberty and libbfd-liberty-z), the same has not been done for other features requiring linking to libbfd. For example, disassembler-four-args requires linking to libbfd too, but it should use the right linking flags. If not all the required ones are specified, e.g. -liberty, detection will always fail even if the feature is available. Instead of creating new features, similarly to libbfd, simply retry detection with the different set of flags until detection succeeds (or fails, if the libraries are missing). In this way, feature detection is transparent for the users of this building mechanism (e.g. perf), and those users don't have for example to set an appropriate value for the FEATURE_CHECK_LDFLAGS-disassembler-four-args variable. The number of retries and features for which the retry mechanism is implemented is low enough to make the increase in the complexity of Makefile negligible. Tested with perf and bpftool on Ubuntu 20.04.4 LTS, Fedora 36 and openSUSE Tumbleweed. Signed-off-by: Roberto Sassu --- tools/build/feature/Makefile | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile index 7c2a17e23c30..063dab19148c 100644 --- a/tools/build/feature/Makefile +++ b/tools/build/feature/Makefile @@ -89,6 +89,8 @@ all: $(FILES) __BUILD = $(CC) $(CFLAGS) -MD -Wall -Werror -o $@ $(patsubst %.bin,%.c,$(@F)) $(LDFLAGS) BUILD = $(__BUILD) > $(@:.bin=.make.output) 2>&1 + BUILD_BFD = $(BUILD) -DPACKAGE='"perf"' -lbfd -ldl + BUILD_ALL = $(BUILD) -fstack-protector-all -O2 -D_FORTIFY_SOURCE=2 -ldw -lelf -lnuma -lelf -lslang $(FLAGS_PERL_EMBED) $(FLAGS_PYTHON_EMBED) -DPACKAGE='"perf"' -lbfd -ldl -lz -llzma -lzstd -lcap __BUILDXX = $(CXX) $(CXXFLAGS) -MD -Wall -Werror -o $@ $(patsubst %.bin,%.cpp,$(@F)) $(LDFLAGS) BUILDXX = $(__BUILDXX) > $(@:.bin=.make.output) 2>&1 @@ -96,7 +98,7 @@ __BUILDXX = $(CXX) $(CXXFLAGS) -MD -Wall -Werror -o $@ $(patsubst %.bin,%.cpp,$( ############################### $(OUTPUT)test-all.bin: - $(BUILD) -fstack-protector-all -O2 -D_FORTIFY_SOURCE=2 -ldw -lelf -lnuma -lelf -lslang $(FLAGS_PERL_EMBED) $(FLAGS_PYTHON_EMBED) -DPACKAGE='"perf"' -lbfd -ldl -lz -llzma -lzstd -lcap + $(BUILD_ALL) || $(BUILD_ALL) -lopcodes -liberty $(OUTPUT)test-hello.bin: $(BUILD) @@ -240,13 +242,14 @@ $(OUTPUT)test-libpython.bin: $(BUILD) $(FLAGS_PYTHON_EMBED) $(OUTPUT)test-libbfd.bin: - $(BUILD) -DPACKAGE='"perf"' -lbfd -ldl + $(BUILD_BFD) $(OUTPUT)test-libbfd-buildid.bin: - $(BUILD) -DPACKAGE='"perf"' -lbfd -ldl + $(BUILD_BFD) || $(BUILD_BFD) -liberty || $(BUILD_BFD) -liberty -lz $(OUTPUT)test-disassembler-four-args.bin: - $(BUILD) -DPACKAGE='"perf"' -lbfd -lopcodes + $(BUILD_BFD) -lopcodes || $(BUILD_BFD) -lopcodes -liberty || \ + $(BUILD_BFD) -lopcodes -liberty -lz $(OUTPUT)test-reallocarray.bin: $(BUILD)