[petsc-dev] BuildSystem help needed

Matthew Knepley knepley at gmail.com
Fri Jul 22 20:10:29 CDT 2011

On Sat, Jul 23, 2011 at 3:03 AM, Barry Smith <bsmith at mcs.anl.gov> wrote:

>   Matt,
>   When a user provides --download-packagename for any package that does not
> support --download-   configure silently ignores their request leading the
> user to think that it actually did download the package.
>   This is because in package.py there is the code
>  def checkDownload(self, requireDownload = 1):
>    '''Check if we should download the package, returning the install
> directory or the empty string indicating installation'''
>    if not self.download:
>      return ''
>   I naively thought I could simple add a check if the user provided
> --download-package but self.download was not supported it would error out
> with a useful error message. That proved impossible.

Impossible!!! This is ridiculous. Either I have no idea what you want, or
this is a serious case of Not Invented Here syndrome (also I did not even
write these lines of code).

@@ -480,6 +480,8 @@
         raise RuntimeError('External package '+self.name+' does not work on
Microsoft Windows')
       if self.download and
self.framework.argDB.has_key('download-'+self.downloadname.lower()) and
self.framework.argDB['download-'+self.downloadname.lower()] and not
self.downloadonWindows and self.setCompilers.isCygwin():
         raise RuntimeError('External package '+self.name+' does not support
--download-'+self.downloadname.lower()+' on Microsoft Windows')
+    if not self.download and
self.framework.argDB.has_key('download-'+self.downloadname.lower()) and
+      raise RuntimeError('External package '+self.name+' does not support


>   Could you please add something to BuildSystem so that if a user requests
> --download-packagename but that functionality is not supported it generates
> a nice error message, in particular this needs to work for --download-thrust
> --download-cusp and --download-cuda but there are many others as well.
>    Thanks
>    Barry

What most experimenters take for granted before they begin their experiments
is infinitely more interesting than any results to which their experiments
-- Norbert Wiener
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