similar to: [LLVMdev] Setting up a cross-compiler for cortex-m3

Hi there, I'm trying to switch from GCC to llvm (clang++) for cross-compiling a firmware of mine for a stm32 (ARM cortex-m3). After looking in the documentation and a bit of googling here is what I did (in case someone else in the future is having the same problem) cd llvm git clone http://llvm.org/git/llvm.git cd llvm/tools git clone http://llvm.org/git/clang.git cd llvm/projects git

On 18 July 2012 14:33, salvatore benedetto <salvatore.benedetto at gmail.com> wrote: > but I still haven't figure out how to build for cortex-m3 > > clang -march=armv7-m -mfloat-abi=soft <something missing?> testReference.cpp -c -march should have done the trick. You can also try -mcpu=cortex-m3, or try -ccc-host-triple armv7m-none-gnueabi (or -eabi), and possibly

On 18 July 2012 14:57, salvatore benedetto <salvatore.benedetto at gmail.com> wrote: > $ clang -march=armv7-m -mfloat-abi=soft -ccc-host-triple > armv7m-none-gnueabi testReference.cpp -c > fatal error: error in backend: CPU: 'cortex-m3' does not support ARM > mode execution! Ah, yes! Try: $ clang -ccc-host-triple thumbv7m-none-gnueabi testReference.cpp -c Cross

On Wed, Jul 18, 2012 at 3:52 PM, Renato Golin <rengolin at systemcall.org> wrote: > On 18 July 2012 14:33, salvatore benedetto > <salvatore.benedetto at gmail.com> wrote: >> but I still haven't figure out how to build for cortex-m3 >> >> clang -march=armv7-m -mfloat-abi=soft <something missing?> testReference.cpp -c > > -march should have done

On Wed, Jul 18, 2012 at 4:15 PM, Renato Golin <rengolin at systemcall.org> wrote: > On 18 July 2012 14:57, salvatore benedetto > <salvatore.benedetto at gmail.com> wrote: >> $ clang -march=armv7-m -mfloat-abi=soft -ccc-host-triple >> armv7m-none-gnueabi testReference.cpp -c >> fatal error: error in backend: CPU: 'cortex-m3' does not support ARM >>

On 18 July 2012 15:24, salvatore benedetto <salvatore.benedetto at gmail.com> wrote: > I'm not sure how to interpret the above output, but I don't understand > why if say -triple armv4t-none--gnueabi . Ok, we're getting there... ;) I think these errors are due to Clang not finding the libraries/includes/etc for the target you're building. If you have

On Wed, Jul 18, 2012 at 5:45 PM, Renato Golin <rengolin at systemcall.org> wrote: > On 18 July 2012 15:46, salvatore benedetto > <salvatore.benedetto at gmail.com> wrote: >> $ clang++ -ccc-host-triple thumbv7m-none-gnueabi noInclude.cpp -c >> --sysroot=/home/emitrax/CodeSourcery/Sourcery_G++_Lite/arm-none-linux-gnueabi/libc/ > > Try -ccc-gcc-name

On Wed, Jul 18, 2012 at 4:31 PM, Renato Golin <rengolin at systemcall.org> wrote: > On 18 July 2012 15:24, salvatore benedetto > <salvatore.benedetto at gmail.com> wrote: >> I'm not sure how to interpret the above output, but I don't understand >> why if say -triple armv4t-none--gnueabi . > > Ok, we're getting there... ;) Glad you are confident.

On 18 July 2012 15:46, salvatore benedetto <salvatore.benedetto at gmail.com> wrote: > $ clang++ -ccc-host-triple thumbv7m-none-gnueabi noInclude.cpp -c > --sysroot=/home/emitrax/CodeSourcery/Sourcery_G++_Lite/arm-none-linux-gnueabi/libc/ Try -ccc-gcc-name arm-none-linux-gnueabi-g++ -ccc-host-triple thumbv7m-none-linux-gnueabi Sometimes it's better than sysroot, as it finds it

On Wed, Jul 18, 2012 at 6:08 PM, salvatore benedetto <salvatore.benedetto at gmail.com> wrote: > On Wed, Jul 18, 2012 at 5:45 PM, Renato Golin <rengolin at systemcall.org> wrote: >> On 18 July 2012 15:46, salvatore benedetto >> <salvatore.benedetto at gmail.com> wrote: >>> $ clang++ -ccc-host-triple thumbv7m-none-gnueabi noInclude.cpp -c >>>

On Mon, Jul 30, 2012 at 10:27 AM, Renato Golin <rengolin at systemcall.org> wrote: > On 30 July 2012 09:14, salvatore benedetto > <salvatore.benedetto at gmail.com> wrote: >> I'm sorry, I should have been more clear. I don't just want to get >> right of the option itself, I want not to >> have the need to a have a GCC cross-toolchain around. > >

On Mon, Jul 30, 2012 at 3:51 AM, Gordon Keiser <gkeiser at arxan.com> wrote: > Making a symlink to clang in the same directory as the GCC / binutils (I'll call it $ARM_BIN) called > > arm-none-linux-gnueabi-clang (and one with clang++ too) > > and another link in the $ARM_BIN/../lib directory to clang directory located under clang's lib (for includes) > should be

On 22 July 2012 22:03, salvatore benedetto <salvatore.benedetto at gmail.com> wrote: > While we are at it, if a new comer would like to understand where everything > takes place, where should he look? > > I did a grep in the source and eventually ended up in clang/something/driver. That's pretty much it: clang/lib/Driver

On 18 July 2012 17:08, salvatore benedetto <salvatore.benedetto at gmail.com> wrote: > I of course own you a beer :-) Thank you very much. I will remind you of that, next year, on EuroLLVM 2013. :D > Which part of gcc I'm using with that option? > Just the libc, libgcc et all? AFAIK, it uses the name to find the tool chain, and guess all other binaries from it. So it calls

On 30 July 2012 09:14, salvatore benedetto <salvatore.benedetto at gmail.com> wrote: > I'm sorry, I should have been more clear. I don't just want to get > right of the option itself, I want not to > have the need to a have a GCC cross-toolchain around. That requires a bit more than just compiling binutils. You'll need a working linker and a perfect interaction between

On Sun, Jul 22, 2012 at 11:12 PM, Renato Golin <rengolin at systemcall.org> wrote: > On 22 July 2012 22:03, salvatore benedetto > <salvatore.benedetto at gmail.com> wrote: >> While we are at it, if a new comer would like to understand where everything >> takes place, where should he look? >> >> I did a grep in the source and eventually ended up in

On 23 July 2012 17:03, Chris Cadwallader <ccadwallader at arxan.com> wrote: > On Darwin, if -march is armv7 clang's driver will assume you want thumb2 unless you also give it -mno-thumb but that is irrelevant with mcpu=cortex-m3. I think that Thumb2 should be the default for v7 on any system, not just Darwin. Maybe some ARM folk can comment on this... -- cheers, --renato

On Sun, Jul 22, 2012 at 10:37 PM, Renato Golin <rengolin at systemcall.org> wrote: > On 22 July 2012 20:42, Anton Korobeynikov <anton at korobeynikov.info> wrote: >>> Any suggestions? >> Try to specify CPU explicitly. > > He shouldn't have to, but that might help. Maybe setting -march? This > is a big mess... > > I thought that v7 always assumed

On Mon, Jul 23, 2012 at 8:14 PM, Renato Golin <rengolin at systemcall.org> wrote: > On 23 July 2012 17:03, Chris Cadwallader <ccadwallader at arxan.com> wrote: >> On Darwin, if -march is armv7 clang's driver will assume you want thumb2 unless you also give it -mno-thumb but that is irrelevant with mcpu=cortex-m3. > > I think that Thumb2 should be the default for v7

On Sun, Jul 22, 2012 at 9:42 PM, Anton Korobeynikov <anton at korobeynikov.info> wrote: >> Any suggestions? > Try to specify CPU explicitly. Already did. clang++ -ccc-gcc-name arm-none-linux-gnueabi-g++ -ccc-host-triple thumbv7m-none-gnueabi testReference.cpp -c -mcpu=cortex-m3 fatal error: error in backend: CPU: 'cortex-m3' does not support ARM mode execution! S.