[petsc-users] how to rebuild from updated repo

[Jed Brown]

On Mon, Nov 7, 2011 at 15:07, Shao-Ching Huang <huangsc at gmail.com> wrote:

> I was thinking rebuilding in 5 seconds, if I could reuse most of the
> already-built .o files. (Like in a typical makefile scenario -- only
> the changed source files are re-compiled). It seems that the petsc
> "make" command cleans up all the .o files automatically.
>

If you have CMake on your system, "make" runs a parallel CMake-generated
build that does dependency analysis. A "do-nothing" build should take about
1 second. But if you haven't updated for a while, it's likely that a header
has changed that will require recompiling more.
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