Re: Rebuild issue with CheckLib()?

On 4/28/21 1:50 AM, Herzog, Tobias (G3-29) wrote:
> Hi SCons-Users,
> 
> I discovered an issue (?) with missing rebuilds. It seems that rebuilds are not triggered, if the presence of an external lib is tested with the CheckLib Method.
> 
> I am using an SConstruct with the following content:
> 
> env = Environment(LIBPATH=['#mylib'])
> 
> conf = Configure(env)
> if not conf.CheckLib('gtestd'):
>      print('Error')
>      Exit(1)
> conf.Finish()
> 
> env.Append(LIBS=['gtestd'])
> env.Program('test.cpp')
> 
> If you modify "mylib/gtestd.lib" (I am using MSVC compiler on Windows), no rebuild is triggered ("scons: `.' is up to date."). However the dependencies are detected correctly ("scons --tree=all"). Even with "-config=force" no rebuild is triggered. If I leave out the Configure section it works like expected.
> 
> Is this a bug or a feature? Maybe this is not a common use case, but I would expect a rebuild here.

I am thinking this is probably related to 
https://github.com/SCons/scons/issues/2485
which is quite an old bug that seems to have had lots of analysis... and 
then no resolution.