CODEWITHSUNDEEP
cbuildscons
ugoren
ugoren

Reputation: 16449

SCons - Add dependency for all objects in a library

I have this SConstruct file:

lib=Library("foo", "foo.c", CPPFLAGS="-include foo.h")

Because of -include, I need to recompile whenever foo.h changes. SCons doesn't automatically figure this out.

I tried adding a dependecy - Depends(lib, "foo.h") - but it only causes a useless relink.

How can I make foo.c recompile when foo.h changes?

Extra credit - what I really need is to recompile not only when foo.h changes, but also when headers it includes change. But detecting foo.h changes are good enough.

Upvotes: 0

Views: 831

Answers (1)

dirkbaechle
dirkbaechle

Reputation: 4052

As a first shot this is the best I can come up with:

# Construct special environment
env = Environment()
env.Append(CPPFLAGS = ['-include', 'foo.h'])

# Compile objects separately
objs = env.Object(Glob('*.c'))

# Add explicit dependencies
add_deps = ['foo.h']
for o in objs:
    env.Depends(o, add_deps)

# Create final library
env.Library('myfoo', objs)

The extension *.o isn't mentioned directly anywhere in the build description, and add_deps can easily be extended by the headers that get included via "foo.h".

Upvotes: 1

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