Implicit List of All Build Targets in SCONS? - c++

Question

I have an scons project that force includes several header files as a compiler flag.
# Forced include files passed directly to the compiler
env.Append(CCFLAGS = ['/FIinclude.h'])
These files are not included by any files in the project. I need to add an explicit dependency for them.
forced_include_headers = ['include.h']
# Trying to add an explicit dependency for each build target
for object in BUILD_TARGETS:
env.Depends(object, forced_include_headers)
The problem I'm running into is that BUILD_TARGETS list is empty. It seems to only contain things passed from COMMAND_LINE_TARGETS or DEFAULT_TARGETS. All of the targets in our project are built implicitly. We do not make use of env.Default, etc. Is there a way to get the implicit target list, or do I have to manually build it? I noticed that TARGETS is reserved and does not seem to contain what I want either.
I can add an env.Depends(target, forced_include_headers) for all of the targets in their respective SConscript files, but the project is quite large.

Answer 1

I'm not sure that this is the best way to solve the problem (in fact, I think the idea of creating a pseudo-builder works better), but this code will return a list of Object targets:
# Typical SConstruct / SConscript
env = Environment()
env.Program('foo.c')
lib = env.SharedLibrary('bar.c')
env.Program('foo2.c', LIBS=[lib])
SConscript('subdir/SConscript', exports={'env':env})
# Get a list of all Object targets
def get_all_targets(env, node='.'):
def get_all_targets_iter(env, node):
if node.has_builder() and node.get_builder().get_name(env) in ('Object', 'SharedObject'):
yield node
for kid in node.all_children():
for kid in get_all_targets(env, kid):
yield kid
node = env.arg2nodes(node, env.fs.Entry)[0]
return list(get_all_targets_iter(env, node))
# Force them all to depend upon some header
env.Depends(get_all_targets(env), 'site_wide.h')