[Scons-users] Code organization

[Managan, Rob]

I believe that Scons does call the preprocessor. It definitely works for
items added to CPPDEFINES; they get added to the command line and my code
relies on them; at least for things like #ifdef ...

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Rob Managan                             email managan at llnl.gov
LLNL                                             phone: 925-423-0903
P.O. Box 808, L-095                   FAX:   925-422-3389
Livermore, CA  94551-0808





On 1/16/14 1:00 PM, "Dirk Bächle" <tshortik at gmx.de> wrote:


>Hi Russell,

>

>On 16.01.2014 19:11, Russell, J.J. wrote:

>> THE PROBLEM

>> This is a request for some best practices advice on laying out

>>directories for target specific code and not using the preprocessor

>>(which SCONs does not run) within the code to select the proper target

>>specific code.

>>

>> BACKGROUND

>> In the cross-development environment we operate within, there is the

>>issue of how to handle target specific C and C++ code.  The two common

>>tactics are

>>

>>     1) Using the preprocessor #ifdef¹s

>>     2) Using #include¹s of the form

>>             #include ³package/target-specific/xx.h²

>>

>> We discouraged #1, since it just litters the code, rendering it

>>difficult to read and try to confine the target specific stuff to

>>includes.

>>

>>   For the #include¹s we further discourage this construct

>>

>>          #if defined (TARGET1)

>>         #  include ³package/TARGET1/xx.h²

>>         #elif defined (TARGET2)

>>         # include ³package/TARGET2/xx.h²

>>            etc.

>

>this looks like you try to "wink in" different trees of include files

>for each target. The Repository() function might be what you're looking

>for, UserGuide, chap. 22, "Building From Code Repositories":

>

>   http://www.scons.org/doc/production/HTML/scons-user/c4041.html

>

>Best regards,

>

>Dirk

>

>

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