[Scons-users] [c++] Automatically choosing sources for linking

[Dirk Bächle]

On 29.03.2014 22:10, Scott Davies wrote:

> I'm playing with the dependency calculation stuff in SCons using 

> http://www.scons.org/wiki/ExplicitlyCallCppScanner as a starting 

> point, and have immediately hit two problems.

>

> 1) I'm having trouble getting the scanner to pay any attention to 

> CPPPATH...as far as I can tell it's behaving as if the path is always 

> set to '.'.

>

> Simple example (note how c.h doesn't show up as a dependency despite 

> CPPPATH being set in the environment):

>

> [...]

>

> Any idea what might be going on here?  (I'm a newbie at both SCons and 

> Python, so I'm probably doing something stupid.)

>

Looks like you need

   includes = scanner(f, env, scanner.path_function(env))

instead of

   includes = scanner(f, env)

. Looks a bit magic and I don't want to go into all the gory details 
about it right now. Instead I'll update the Wiki page accordingly, as  
soon as I find the time.


>

>

> 2) In another test on my actual codebase, if I use 

> SCons.Scanner.C.SConsCPPScannerWrapper('prescanner','.') rather 

> than SCons.Scanner.C.CScanner(), the scanner crashes (causing scons to 

> terminate) on one of my source files thusly:

>


The current scanner doesn't support full expansion and tracking of 
macros, and probably never will. However, an issue report would help 
here because the parsing shouldn't crash...

Dirk