[Scons-users] Export command and CPPPATH concatenation

[Dirk Bächle]

On 01.02.2014 09:51, Laurent wrote:

> Hi Dirk,

>

> Le 31 janv. 2014 à 23:12, Dirk Bächle <tshortik at gmx.de 

> <mailto:tshortik at gmx.de>> a écrit :

>

>> [...]

>

> No, I never try to add ‘./A’ to CPPPATH, this is why I am concerned. I 

> can send you this example by mail. I don’t know if I can add it to the 

> user mailing list so I did not provided it.

>

> The SConstruct and SConscript files provided in the mail are complete 

> (except for the missing ‘)’ in the SConstruct). From the example you 

> can see that adding './A’ to the CPPPATH is not necessary (no include 

> file in this directory). So I did not do it. Scons is automatically 

> adding ‘./A’ to the CPPPATH which I find rather strange.

>


Thanks for checking your input files again. I saw the missing ')' too, 
so I wasn't sure about whether your set of input files would be complete 
or not.

What is happening is that you specify the CPPPATH variable in the 
top-level SConstruct. But it gets evaluated during the call to 
StaticLibrary in the subfolder "A". Based on SCons' hierarchical build 
style, filenames and paths get interpreted relative to the current 
directory. That's why the "A" folder gets prepended to your path a 
second time, and this is normal and wanted behaviour.

To get around this, please either

- change your CPPPATH to a simple "./B", or
- use the "absolute path" specifier "#A/B".

My preferred method for the first option is to export the environment 
as-is to my SConscripts, and create a shallow Clone() copy where I
add include or library paths locally. This is less confusing, and makes 
it easier to move complete source folders around or rename them.

Hope this helps,

Dirk

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