[Scons-users] Building SDL 2 with SCons on Linux

[Dirk Bächle]

Hi Davide,

On 13.03.2014 16:00, Davide Coppola wrote:

> I wrote a tutorial about how to build SDL2 as a static library on 

> Linux using  SCons: 

> http://blog.davidecoppola.com/2014/03/13/building-sdl-2-with-scons-on-linux/ 

>

>


thanks a lot for publishing your scripts. I really like the style of 
your writing, the article reads nicely.


> Please check it out and let me know if you have any comment or 

> suggestion for improving the scripts.

>


I have indeed a few comments, especially regarding your usage of the 
variant_dir feature.

1.) If your projects get bigger and you would perhaps like to create 
several (all?) variants with *one* call of SCons, here's what you could 
change: Create another SConscript, right beside your top-level 
SConstruct. It only contains the includes to the lower directories, so:

   Import('env')
   SConscript('src/libs/SDL2/SConscript', exports = 'env', variant_dir = 
'build/' + env['mode'], src_dir = 'src', duplicate = 0)
   SConscript('src/game/SConscript', exports = 'env', variant_dir = 
'build/' + env['mode'], src_dir = 'src', duplicate = 0)

Then, set up single environments for the variants you'd like to create 
in your SConstruct:

   env = Environment(variables = vars)
   debugEnv = env.Clone()
   debugEnv.Append(CCFLAGS = ['-Wall', '-g', '-O0', '-DDEBUG'])
   debugEnv['mode'] = 'debug'

   ...
   profileEnv = env.Clone()
   profileEnv.Append(CCFLAGS = ['-Wall', '-pg', '-O0', '-DNDEBUG'])
   profileEnv['mode'] = 'profile'

Now, you can do things like

   mode_env = {'debug' : debugEnv,
                          'release' : releaseEnv,
                          'profile' : profileEnv}
   for m in mode_env:
     SConscript('SConscript', exports={'env' : mode_env[m]})

and get all variants at once.

2.) As another minor point, in the SConscripts you create localEnvs via 
Clone(). This is okay, but when you then call localEnv.Program() (or any 
other builder that is defined within the localEnv environment) and 
additionally give parameters like LIBPATH to this call, this means that 
internally another Environment (a so called OverrideEnvironment) gets 
created.
Doesn't really hurt, but it's actually unnecessary. You don't use the 
localEnv for anything else, so just set it up completely like for the 
other variables:

   localEnv.Append(CPPPATH=['#/src/libs/SDL2/include'])
   localEnv.Append(CCFLAGS = ['-D_REENTRANT'])
   localEnv.Append(LINKFLAGS=['-Wl,--no-undefined'])
   localEnv.Append(LIBS=['SDL2', 'pthread', 'm', 'dl', 'ts', 'pthread', 
'rt'])
   localEnv.Append(LIBPATH=['../libs/SDL2'])

Finally, feel free to add your project as snippet to our Wiki, under the 
"Recipes" section ( http://www.scons.org/wiki/SconsRecipes ) . We can 
always use more good examples like this one.

Best regards,

Dirk

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