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

[Davide Coppola]

Hey Dirk,

I'm glad you appreciated the post, thanks.


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.

>


I was aware of that (I probably saw something similar on the wiki), but I
prefer to be able to control which build is created at any time.
I'll keep your solution in mind though, as I could change my mind at some
point!




> 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'])

>


Wow, I wasn't aware of that!
I changed my scripts and updated the blog post with your suggestion, thanks



> 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.

>


I'd like to, but the WIKI doesn't allow me to create an account... I get
the following error message when I try: "Unknown action newaccount."
Could you or someone else fix that?

Thanks again


-- 
Davide Coppola

*email:* vivaladav at gmail.com
*website:* http://www.davidecoppola.com
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