[LLVMdev] LLVM-gcc for ARM

corina s corina_fff at yahoo.com
Sun Jan 17 01:36:27 PST 2010


 ../llvm-gcc4.2-2.6.source/configure --prefix=`pwd`/../install --program-prefix=llvm- --enable-llvm=/home/LLVM/llvm-2.6/ --enable-languages=c,c++  

and then make target=arm-elf gives the following error:

Unknown arch used in --with-arch=armv7


--- On Sun, 1/17/10, corina s <corina_fff at yahoo.com> wrote:

From: corina s <corina_fff at yahoo.com>
Subject: Re: [LLVMdev] LLVM-gcc for ARM
To: "Anton Korobeynikov" <anton at korobeynikov.info>, llvmdev at cs.uiuc.edu
Date: Sunday, January 17, 2010, 1:00 AM

Thanks for your tips.. But I'm still getting errors.

.../llvm-gcc4.2-2.6.source/configure --prefix=`pwd`/../install --program-prefix=llvm- --enable-llvm=/home/LLVM/llvm-2.6/ --enable-languages=c,c++  --with-gnu-ld=/home/arm/bin/arm-elf-ld 

checking for g++ that supports -ffunction-sections -fdata-sections... yes
configure: error: No support for this host/target combination.
make[1]: *** [configure-target-libstdc++-v3] Error 1

Thank you for your help,

--- On Sat, 1/16/10, Anton Korobeynikov <anton at korobeynikov.info> wrote:

From: Anton Korobeynikov <anton at korobeynikov.info>
Subject: Re: [LLVMdev] LLVM-gcc for ARM
To: "corina s" <corina_fff at yahoo.com>
Cc: llvmdev at cs.uiuc.edu
Date: Saturday, January 16, 2010, 6:09 PM


> /tmp/ccm99Neh.s:711: Error: selected
 processor does not support `sxtb r1,r1'
> make[3]: *** [libgcc/thumb/unwind-dw2-fde.o] Error 1
> Any ideas?
Yes. LLVM defaults to ARMv5 in codegeneration and does not support
ARMv4. Without any extra option arm-elf-as assumes ARMv4 and thus
gives you these errors. So:

1. If your desired target platform is ARMv4 and not newer - then
you're out of luck
2. Otherwise - add --with-cpu or --with-arch to llvm-gcc configure to
select the processor / arch desired.

It seems that you're interested in Cortex CPUs
("/tmp/arm-cortex-toolchain"), then your desired arch is armv7,
configure with --with-arch=armv7 or e.g. --with-cpu=cortex-a8

With best regards, Anton Korobeynikov
Faculty of Mathematics and Mechanics, Saint Petersburg State University

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