From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_2 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 554CCC4361B for ; Mon, 14 Dec 2020 21:27:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 113602076D for ; Mon, 14 Dec 2020 21:27:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2503444AbgLNV1s (ORCPT ); Mon, 14 Dec 2020 16:27:48 -0500 Received: from mail.kernel.org ([198.145.29.99]:43772 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2503589AbgLNV1s (ORCPT ); Mon, 14 Dec 2020 16:27:48 -0500 Received: from gandalf.local.home (cpe-66-24-58-225.stny.res.rr.com [66.24.58.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C435820732 for ; Mon, 14 Dec 2020 21:27:07 +0000 (UTC) Date: Mon, 14 Dec 2020 16:27:06 -0500 From: Steven Rostedt To: Linux Trace Devel Subject: [PATCH] libtracefs: Add trace.conf for ld.so if needed Message-ID: <20201214162559.685f65ba@gandalf.local.home> X-Mailer: Claws Mail 3.17.3 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-trace-devel@vger.kernel.org From: "Steven Rostedt (VMware)" It cannot be guaranteed that the system the library is being installed on has ld.so set to search the location of where libtracefs.so is installed. During the install process, check if the path is found in ld.so.conf.d/ and if not, test if an executable can be built and find the library. If it can not, then add the path to ld.so.conf.d/trace.conf, and run ldconfig again. Signed-off-by: Steven Rostedt (VMware) --- Makefile | 26 ++++++++++++++++++++++++++ test.c | 7 +++++++ 2 files changed, 33 insertions(+) create mode 100644 test.c diff --git a/Makefile b/Makefile index b4d0a72..5a3cd04 100644 --- a/Makefile +++ b/Makefile @@ -28,6 +28,8 @@ endef $(call allow-override,CC,$(CROSS_COMPILE)gcc) $(call allow-override,AR,$(CROSS_COMPILE)ar) $(call allow-override,PKG_CONFIG,pkg-config) +$(call allow-override,LD_SO_CONF_PATH,/etc/ld.so.conf.d/) +$(call allow-override,LDCONFIG,ldconfig) EXT = -std=gnu99 INSTALL = install @@ -235,11 +237,35 @@ cscope: force $(RM) cscope* $(call find_tag_files) | cscope -b -q +ifeq ("$(DESTDIR)", "") +# If DESTDIR is not defined, then test if after installing the library +# and running ldconfig, if the library is visible by ld.so. +# If not, add the path to /etc/ld.so.conf.d/trace.conf and run ldconfig again. +define install_ld_config + $(LDCONFIG); \ + if ! grep "^$(libdir)$$" $(LD_SO_CONF_PATH)/* &> /dev/null ; then \ + $(CC) -o $(OUTPUT)test $(srctree)/test.c -I $(includedir_SQ) \ + -L $(libdir_SQ) -ltracefs; \ + if ! $(OUTPUT)test > /dev/null; then \ + echo $(libdir_SQ) >> $(LD_SO_CONF_PATH)/trace.conf; \ + $(LDCONFIG); \ + fi; \ + echo $(RM) $(OUTPUT)test; \ + fi +endef +else +# If installing to a location for another machine or package, do not bother +# with running ldconfig. +define install_ld_config +endef +endif # DESTDIR = "" + install_libs: libs install_pkgconfig $(Q)$(call do_install,$(LIBTRACEFS_SHARED),$(libdir_SQ)); \ cp -fpR $(LIB_INSTALL) $(DESTDIR)$(libdir_SQ) $(Q)$(call do_install,$(src)/include/tracefs.h,$(includedir_SQ)) $(Q)$(call do_install_ld,$(TRACE_LD_FILE),$(LD_SO_CONF_DIR),$(libdir_SQ)) + $(Q)$(call install_ld_config) install: install_libs diff --git a/test.c b/test.c new file mode 100644 index 0000000..daf99d6 --- /dev/null +++ b/test.c @@ -0,0 +1,7 @@ +#include + +int main() +{ + tracefs_get_tracing_dir(); + return 0; +} -- 2.25.4