On 29 October 2014 02:26, Jongsung Kim <neidhard....@lge.com> wrote: > The version-string from binutils-linaro looks to be blamed. It once was: > > GNU ld (crosstool-NG linaro-1.13.1-4.7-2013.04-20130415 - Linaro GCC 2013.04) > 2.23.1 > > and the linker plugin works with this version of Linaro prebuilt toolchain. > Now it is: > > GNU ld (crosstool-NG linaro-1.13.1-4.8-2014.04 - Linaro GCC 4.8-2014.04) > 2.24.0.20140311 Linaro 2014.03 > GNU ld (crosstool-NG linaro-1.13.1-4.9-2014.08 - Linaro GCC 4.9-2014.08) > 2.24.0.20140801 Linaro 2014.08 > > and the linker plugin is not supported: > > $ arm-linux-gnueabihf-gcc -flto -fuse-linker-plugin -o hello hello.c > arm-linux-gnueabihf-gcc: error: -fuse-linker-plugin is not supported in this > configuration > > Look into gcc/configure script. It uses the version of ld to determine > whether ld supports linker plugin. It extracts the version by doing something > like: > > $ arm-linux-gnueabihf-ld --version | sed 1q | sed -n -e 's,^.*[ > ]\([0-9][0-9]*\.[0-9][0-9]*.*\)$,\1,p' > > and it will extract the last 2014.03 or 2014.08. By using proper substitution > expression like 's,^GNU ld (.*) \([0-9][.0-9]*\).*$,\1,p', the script may > enable linker plugin. > > However, patching the script looks like a bad idea, because it doesn’t help > handling the version of gold: > > GNU gold (GNU Binutils for Ubuntu 2.24) 1.11 > GNU gold (crosstool-NG linaro-1.13.1-4.7-2013.04-20130415 - Linaro GCC > 2013.04 2.23.1) 1.11 > GNU gold (crosstool-NG linaro-1.13.1-4.8-2014.04 - Linaro GCC 4.8-2014.04 > 2.24.0.20140311 Linaro 2014.03) 1.11 > GNU gold (crosstool-NG linaro-1.13.1-4.9-2014.08 - Linaro GCC 4.9-2014.08 > 2.24.0.20140801 Linaro 2014.08) 1.11 > > I couldn’t find a reasonable general expression to extract the version.
This should be fixed in binutils-linaro-2.24-2014.11. > From: linaro-toolchain-boun...@lists.linaro.org > [mailto:linaro-toolchain-boun...@lists.linaro.org] On Behalf Of 박주형 > Sent: Monday, October 27, 2014 10:15 PM > To: linaro-andr...@lists.linaro.org; linaro-toolchain@lists.linaro.org > Subject: Enabling back linker plugin for Linaro Android toolchain > > I'm using Linaro Android toolchain's arm-eabi- for compiling my Android Linux > kernel with LTO. > > The main benefits of my kernel is that it uses LTO(Link-Time-Optimizations). > (Patches found here: https://github.com/andikleen/linux-misc) > > But now, it's broken with Linaro Android toolchains from 2014.09~ > > Building Linux kernel with LTO requires Linker plugin with the toolchain. > > > But for some reason, linker plugin is disabled with 2014.09 and 2014.10 > (Which I used from here : > https://android-build.linaro.org/builds/~linaro-android/toolchain-4.9-2014.09 > https://android-build.linaro.org/builds/~linaro-android/toolchain-4.9-2014.10 > ) > > LTO build works flawlessly with 2014.08. > > With 2014.09 and 2014.10, I get the following error : > cc1: error: -fno-fat-lto-objects are supported only with linker plugin > > If I explicitly remove " -fno-fat-lto-objects " from the Makefile, the linker > fails to link all of the object files. > > > I would like to ask Linaro to enable back the Linker plugin support :) > > Thanks in advance.. > > > _______________________________________________ > linaro-toolchain mailing list > linaro-toolchain@lists.linaro.org > http://lists.linaro.org/mailman/listinfo/linaro-toolchain -- Will Newton Toolchain Working Group, Linaro _______________________________________________ linaro-toolchain mailing list linaro-toolchain@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-toolchain
