[mpich-discuss] how to specify CFLAGS in configuring mpich

[Syed. Jahanzeb Maqbool Hashmi]

Thanks for the help


On Thu, Jul 25, 2013 at 10:21 AM, Pavan Balaji <balaji at mcs.anl.gov> wrote:

>
> 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 at 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
>
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