[petsc-dev] CFLAGS / LDFLAGS and cxx error

[Wesley Smith]

that's interesting.  I had just assumed at CFLAGS would be
concatenated onto CXXFLAGS.  I see that this isn't the case.  I'll try
again.

wes

On Wed, Jul 28, 2010 at 11:30 AM, Barry Smith <bsmith at mcs.anl.gov> wrote:
>
> On Jul 28, 2010, at 1:12 PM, Wesley Smith wrote:
>
>> On Wed, Jul 28, 2010 at 11:10 AM, Barry Smith <bsmith at mcs.anl.gov> wrote:
>>>
>>>  You are passing the CFLAGS="-arch i386"  to C but not g++ hence g++ is using the 64 bit. You need to set CXXFLAGS also to use 32 bit.
>>
>> yes, but why would it not be able to find any CXX compiler when
>> setting those flags?
>
>
>    If you look at the configure.log in detail you can see why. The g++ test works,. but then it does a test to see if the g++ and gcc compilers can be used together this fails because they are built with different arches.
>
>   Barry
>
> sh: g++ -c -o conftest.o     conftest.cc
> Executing: g++ -c -o conftest.o     conftest.cc
>
> Executing: g++  -o conftest -arch i386   conftest.o
> sh:
> Possible ERROR while running linker: ld: warning: in conftest.o, file was built for unsupported file format which is not the architecture being linked (i386)
> Undefined symbols:
>  "_main", referenced from:
>      start in crt1.10.6.o
> ld: symbol(s) not found
>
>
>