From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754638AbYEWQ6U (ORCPT ); Fri, 23 May 2008 12:58:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751184AbYEWQ6M (ORCPT ); Fri, 23 May 2008 12:58:12 -0400 Received: from smtp1.linux-foundation.org ([140.211.169.13]:41426 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751102AbYEWQ6L (ORCPT ); Fri, 23 May 2008 12:58:11 -0400 Date: Fri, 23 May 2008 09:56:23 -0700 From: Andrew Morton To: Segher Boessenkool Cc: linux-kernel@vger.kernel.org, Peter Oberparleiter , Peter Oberparleiter , Sam Ravnborg , ltp-coverage@lists.sourceforge.net Subject: Re: [PATCH 0/7] gcov kernel support Message-Id: <20080523095623.5678a34f.akpm@linux-foundation.org> In-Reply-To: References: <48313D8E.7020109@de.ibm.com> <20080523011213.690363c7.akpm@linux-foundation.org> X-Mailer: Sylpheed 2.4.8 (GTK+ 2.12.5; x86_64-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 23 May 2008 13:06:00 +0200 Segher Boessenkool wrote: > >> This is version #2 of the gcov kernel support patch set > > > > powerpc blew up: > > > > /opt/crosstool/gcc-4.1.0-glibc-2.3.6/powerpc64-unknown-linux-gnu/lib/ > > gcc/powerpc64-unknown-linux-gnu/4.1.0/../../../../powerpc64-unknown- > > linux-gnu/bin/ld: skipping incompatible > > /opt/crosstool/gcc-4.1.0-glibc-2.3.6/powerpc64-unknown-linux-gnu/lib/ > > gcc/powerpc64-unknown-linux-gnu/4.1.0/./libgcov.a when searching for > > -lgcov > > /opt/crosstool/gcc-4.1.0-glibc-2.3.6/powerpc64-unknown-linux-gnu/lib/ > > gcc/powerpc64-unknown-linux-gnu/4.1.0/../../../../powerpc64-unknown- > > linux-gnu/bin/ld: cannot find -lgcov > > collect2: ld returned 1 exit status > > make[2]: *** [arch/powerpc/kernel/vdso32/vdso32.so.dbg] Error 1 > > make[1]: *** [arch/powerpc/kernel/vdso32] Error 2 > > Sounds like your toolchain was built without biarch support, but you're > using it for the 32-bit parts of the kernel anyway. Which works as long > as you're not using any libraries, but now you need libgcov.a . ok.. > What does > > /opt/crosstool/gcc-4.1.0-glibc-2.3.6/powerpc64-unknown-linux-gnu/bin/ > powerpc64-unknown-linux-gnu-gcc -v > > say? y:/home/akpm> /opt/crosstool/gcc-4.1.0-glibc-2.3.6/powerpc64-unknown-linux-gnu/bin/powerpc64-unknown-linux-gnu-gcc -v Using built-in specs. Target: powerpc64-unknown-linux-gnu Configured with: /home/axboe/crosstool-0.43/build/powerpc64-unknown-linux-gnu/gcc-4.1.0-glibc-2.3.6/gcc-4.1.0/configure --target=powerpc64-unknown-linux-gnu --host=x86_64-host_unknown-linux-gnu --prefix=/opt/crosstool/gcc-4.1.0-glibc-2.3.6/powerpc64-unknown-linux-gnu --disable-multilib --with-sysroot=/opt/crosstool/gcc-4.1.0-glibc-2.3.6/powerpc64-unknown-linux-gnu/powerpc64-unknown-linux-gnu/sys-root --with-local-prefix=/opt/crosstool/gcc-4.1.0-glibc-2.3.6/powerpc64-unknown-linux-gnu/powerpc64-unknown-linux-gnu/sys-root --disable-nls --enable-threads=posix --enable-symvers=gnu --enable-__cxa_atexit --enable-languages=c --enable-shared --enable-c99 --enable-long-long Thread model: posix gcc version 4.1.0 > (Or whatever the correct path to that compiler is, the directory > structure is a bit unusual here it seems). There shouldn't be a > --disable-biarch there. > > Or, what does > > find > /opt/crosstool/gcc-4.1.0-glibc-2.3.6/powerpc64-unknown-linux-gnu/4.1.0/ > -name libgcov.a > > say? (It should usually find three versions: 64-bit, 32-bit, 32-bit no > float). Only a single hit: /opt/crosstool/gcc-4.1.0-glibc-2.3.6/powerpc64-unknown-linux-gnu/lib/gcc/powerpc64-unknown-linux-gnu/4.1.0/libgcov.a and it contains y:/home/akpm/ppc> ar x libgcov.a y:/home/akpm/ppc> l total 316 -rw-r--r-- 1 akpm akpm 44192 May 23 09:53 _gcov.o -rw-r--r-- 1 akpm akpm 8448 May 23 09:53 _gcov_execl.o -rw-r--r-- 1 akpm akpm 8584 May 23 09:53 _gcov_execle.o -rw-r--r-- 1 akpm akpm 8456 May 23 09:53 _gcov_execlp.o -rw-r--r-- 1 akpm akpm 7384 May 23 09:53 _gcov_execv.o -rw-r--r-- 1 akpm akpm 7544 May 23 09:53 _gcov_execve.o -rw-r--r-- 1 akpm akpm 7392 May 23 09:53 _gcov_execvp.o -rw-r--r-- 1 akpm akpm 7264 May 23 09:53 _gcov_fork.o -rw-r--r-- 1 akpm akpm 7240 May 23 09:53 _gcov_interval_profiler.o -rw-r--r-- 1 akpm akpm 7464 May 23 09:53 _gcov_merge_add.o -rw-r--r-- 1 akpm akpm 8544 May 23 09:53 _gcov_merge_delta.o -rw-r--r-- 1 akpm akpm 8488 May 23 09:53 _gcov_merge_single.o -rw-r--r-- 1 akpm akpm 6976 May 23 09:53 _gcov_one_value_profiler.o -rw-r--r-- 1 akpm akpm 6856 May 23 09:53 _gcov_pow2_profiler.o -rw-r--r-- 1 akpm akpm 146492 May 23 09:52 libgcov.a y:/home/akpm/ppc> file _gcov_merge_delta.o _gcov_merge_delta.o: ELF 64-bit MSB relocatable, 64-bit PowerPC or cisco 7500, version 1 (SYSV), not stripped > > You *can* build with a non-biarch compiler, but then you need to point > the kernel build system at a 32-bit toolchain to use for the 32-bit > parts (via CROSS32_COMPILE). Jens built this one, using crosstool. It is http://userweb.kernel.org/~akpm/cross-compilers/power64-cross.tar.bz2 It was all working happily until gcov came along :(