[petsc-users] Petsc configuration and multiple branch working

[Barry Smith]

   How do you use ccache?  Do you do this “weird” thing

To install for the second method, do something like this:

cp ccache /usr/local/bin/
ln -s ccache /usr/local/bin/gcc
ln -s ccache /usr/local/bin/g++
ln -s ccache /usr/local/bin/cc
ln -s ccache /usr/local/bin/c++

   Thanks

   Barry



On Sep 6, 2014, at 5:50 PM, Jed Brown <jed at jedbrown.org> wrote:

> Barry Smith <bsmith at mcs.anl.gov> writes:
> 
>>   The problem with using different PETSC_ARCH for each branch is that
>>   when you switch the branches it will sometimes/often change an
>>   include file that many of the C files are dependent on so make
>>   gmake will require recompiling much of the library, with different
>>   working directories this will not happen.
> 
> I use ccache so that those "recompiles" take less than 10 seconds on
> average.  I don't think having a separate clone per branch is useful, so
> I just have one clone and about 50 PETSC_ARCHes within it.  Reconfigure
> is usually not necessary unless you have to go way back in history.