Return-Path: Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 8.1 \(1993\)) Subject: Re: [PATCH bluez-utils] Link mcaptest with -lrt From: Marcel Holtmann In-Reply-To: <1419856719-30526-1-git-send-email-thomas.petazzoni@free-electrons.com> Date: Mon, 29 Dec 2014 09:40:04 -0800 Cc: linux-bluetooth@vger.kernel.org Message-Id: References: <1419856719-30526-1-git-send-email-thomas.petazzoni@free-electrons.com> To: Thomas Petazzoni Sender: linux-bluetooth-owner@vger.kernel.org List-ID: Hi Thomas, > The mcaptest tool uses the profiles/health/mcap.c source file, which > calls clock_getres(). This function is defined in librt, so mcaptest > should be linked against librt, otherwise one gets link failures such > as: > > ld: profiles/health/mcap.o: undefined reference to symbol 'clock_getres@@GLIBC_2.2.5' > ld: note: 'clock_getres@@GLIBC_2.2.5' is defined in DSO [...]/sysroot/lib64/librt.so.1 so try adding it to the linker command line > [...]/sysroot/lib64/librt.so.1: could not read symbols: Invalid operation > collect2: error: ld returned 1 exit status > Makefile:4184: recipe for target 'tools/mcaptest' failed the manpage clearly states to only link against -lrt when using glibc versions before 2.17. If we want to support older glibc, then this might need to be conditional via a configure test. Regards Marcel