[Qt-interest] setting makefile variable from .pro file

[Pete Black]

Pete Black wrote:
> andrew.m.goth at l-3com.com wrote:
>> Pete Black wrote:
>>> Looks like I might have to create a custom make target that sets 
>>> INSTALL_ROOT or script it.
>> I don't think it's possible for a target to set a variable.  Well, one
>> way you could do it (if you were the one writing the makefile, which you
>> aren't!) is with conditional expressions:
> 
> It is actually. Create a custom target that sets INSTALL_ROOT and add it
> to the top of INSTALLS. Problem with this approach is that something is
> needed for when calling make uninstall and those targets only get added
> to the uninstall: makefile target if they have any files associated with
> them. Have a look in the makefile for install: and uninstall and you'll
> see what I mean.
> 
> After some procrastinating I decided to do it quick and dirty like this
> (remember, my only requirement is that it's contained in the .pro file):
> 
> !exists($$MAKEFILE) {
>   system("touch $$MAKEFILE")
>   system("qmake src.pro")
>   INSTALL_ROOT = "\/usr\/local"
>   CMD="sed -i 's/INSTALL_PROGRAM.*=.*/&\nINSTALL_ROOT  =
> $$INSTALL_ROOT/' $$MAKEFILE"
>   system($$CMD)
>   error("Ignore this error, everything is fine!")
> }
> 
> So this will now set a default value in the generated makefile just
> after INSTALL_PROGRAM. It's also possible to override that value like usual:
> 
>   make install INSTALL_ROOT=./
> 
> Anyway, I opened up a feature suggestion request, let's see what happens.
> 
> Pete

Qt opened up a task here:
http://www.qtsoftware.com/developer/task-tracker/index_html?id=246151&method=entry

Pete