You don't need any of these flags if you are building mpich on an armv7 platform. Just do ./configure. -- Pavan On 07/24/2013 07:26 PM, Syed. Jahanzeb Maqbool Hashmi wrote:

Hello

Sorry if I am being so noob in asking this.

I want to build mpich for armv7 and in doing so, I want to specify arm related flags specifically, CFLAGS="-O2 �march=armv7-a �mtune=cortex-a8 �mfpu=neon �mfloat-abi=hard �fomit-frame-pointer"

But when I configure mpich and specify CFLAGS it fails to start by throwing this error.

linaro@weiser1:/mnt/nfs/install/mpich-3.0.4$ ./configure --prefix=/mnt/nfs/install/mpich-install/4.8/ CFLAGS="-O2 -march=armv7-a -mtune=cortex-a9 -mfpu=neon -float-abi=hard -fomit-frame-pointer" Configuring MPICH version 3.0.4 with '--prefix=/mnt/nfs/install/mpich-install/4.8/' 'CFLAGS=-O2 -march=armv7-a -mtune=cortex-a9 -mfpu=neon -float-abi=hard -fomit-frame-pointer' 'CXXFLAGS=-O2 -march=armv7-a -mtune=cortex-a9 -mfpu=neon -mfloat-abi=hard -funsafe-math-optimizations -ffast-math -fomit-frame-pointer' Running on system: Linux weiser1 3.6.0-rc5 #1 SMP PREEMPT Wed Sep 12 16:25:07 KST 2012 armv7l armv7l armv7l GNU/Linux checking for icc... no checking for pgcc... no checking for xlc... no checking for xlC... no checking for pathcc... no checking for cc... cc checking whether the C compiler works... no configure: error: in `/mnt/nfs/install/mpich-3.0.4': configure: error: C compiler cannot create executables See `config.log' for more details

Any help?

Thanks

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-- Pavan Balaji http://www.mcs.anl.gov/~balaji