auto-detection of configure changes

[Stefan (metze) Metzmacher]

tridge at samba.org schrieb:
> Hi Metze,
> 
> This is in regard to the waf TODO item of auto-detecting changes to
> the build scripts that require configure to be re-run.
> 
> I've added this as an option, but have not enabled it by default. To
> enable it use "configure --enable-auto-reconfigure".
> 
> The reason it is off by default is that it interacts badly with the
> configure -C option, and ends up inheriting the private WAFCACHE
> setting used in the implementation of -C into the main build.
> 
> We would also need to split out the build portions of scripts like
> lib/talloc/wscript into lib/talloc/wscript_build, as otherwise you'll
> get a reconfigure on any build rule changes in those scripts as well.
> 
> I'd prefer to leave this off by default for now, and consider
> enabling it by default once these problems are fixed and we have been
> using the waf build for a bit longer. I don't want to destabilise
> things just when I am proposing that waf become the default build
> system for Samba4.

This option might do something useful, but I was more after
giving an error messages the the users has to run configure again,
similar to the error that is raise when the user haven't done configure
at all yet.

metze

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