On Sun, 23 Jun 2019 at 19:44, Tim Janes <twjanes@xxxxxxxxx> wrote: > > I am attempting to build gcc 9.1.0 on an Arm7 (Raspberry Pi) running > piCore Linux distribution, but i wish it to be build to also run on Arm6 > (older Pi). > > My build script looks like this > > export CFLAGS="-O2 -pipe -march=armv6zk -mtune=arm1176jzf-s > -mcpu=arm1176jzf-s -mfpu=vfp -mfloat-abi=hard-fuse-ld=gold" > export CXXFLAGS="-O2 -pipe -fno-exceptions -march=armv6zk > -mtune=arm1176jzf-s -mcpu=arm1176jzf-s -mfpu=vfp -mfloat-abi=hard > -fuse-ld=gold" > export LDFLAGS="-L/usr/local/lib" > > ../gcc-9.1.0/configure \ > --libdir=/usr/lib \ > --enable-shared \ > --enable-threads=posix \ > --enable-__cxa_atexit \ > --enable-c99 \ > --enable-long-long \ > --enable-clocale=gnu \ > --enable-languages=c,c++ \ > --disable-multilib \ > --disable-libstdcxx-pch \ > --enable-cloog-backend=isl \ > --with-isl=/usr \ > --with-system-zlib \ > --enable-frame-pointer \ > --disable-bootstrap \ > --enable-lto \ > --with-pkgversion=piCore \ > --with-arch=armv6zk \ > --with-tune=arm1176jzf-s \ > --with-fpu=vfp \ > --with-float=hard \ > --with-gxx-include-dir=/usr/include/c++/9.1.0 > > but this fails with > > libtool: compile: > /mnt/sda1/piCore/10.x/armv7/tcz/src/gcc/build/./gcc/xgcc > -B/mnt/sda1/piCore/10.x/armv7/tcz/src/gcc/build/./gcc/ > -B/usr/local/armv7l-unknown-linux-gnueabihf/bin/ > -B/usr/local/armv7l-unknown-linux-gnueabihf/lib/ -isystem > /usr/local/armv7l-unknown-linux-gnueabihf/include -isystem > /usr/local/armv7l-unknown-linux-gnueabihf/sys-include -DHAVE_CONFIG_H > -I../../../gcc-9.1.0/libatomic/config/arm > -I../../../gcc-9.1.0/libatomic/config/linux/arm > -I../../../gcc-9.1.0/libatomic/config/posix > -I../../../gcc-9.1.0/libatomic -I. -Wall -Werror -pthread -g -O2 -pipe > -march=armv6zk -mtune=arm1176jzf-s -mcpu=arm1176jzf-s -mfpu=vfp > -mfloat-abi=hard -fuse-ld=gold -MT load_1_1_.lo -MD -MP -MF > .deps/load_1_1_.lo.Ppo -DN=1 -DIFUNC_ALT=1 -march=armv7-a+fp -c > ../../../gcc-9.1.0/libatomic/config/linux/arm/load_n.c -fPIC -DPIC -o > .libs/load_1_1_.o > cc1: error: switch '-mcpu=arm1176jzf-s' conflicts with '-march=armv7-a' > switch [-Werror] > cc1: all warnings being treated as errors > make[4]: *** [Makefile:854: load_1_1_.lo] Error 1 > > How do I stop it picking up march=armv7-a - presumably it is getting > that from the machine I am running on.? > > I have tried adding --with-cpu=arm1176jzf-s to the configuration, with > this I had to remove with-arch and with-tune, but the build gives > exactly the same error. > > Any help or suggestuions would be welcome. GCC assumes you want to build a compiler that runs on the system it's being built. To run on a different system you need to build a cross-compiler, so I think you should use something like: --host=armv6zk-unknown-linux-gnueabihf in the configure arguments.
