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