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waftools: make zcmgen task uid independent of the checkout path #569

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waftools: make zcmgen task uid independent of the checkout path #569

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7 changes: 6 additions & 1 deletion waftools/zcm-gen.py
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Original file line number Diff line number Diff line change
Expand Up @@ -372,15 +372,20 @@ class zcmgen(Task.Task):
ext_in = ['.zcm']
ext_out = ['.c', '.h', '.hpp', '.java', '.py', '.jl']

# Task.uid() plus the package prefix: two task generators over the same sources can differ
# only in the prefix and still produce identically named outputs (nodejs emits zcmtypes.js
# either way). Node paths are taken relative to the source tree so that the uid, and any
# build cache keyed on it, is the same in every checkout of the project.
def uid(self):
try:
return self.uid_
except AttributeError:
src = self.generator.bld.srcnode
m = Utils.md5(self.__class__.__name__.encode('utf-8'))
up = m.update
up(self.generator.pkgPrefix.encode('utf-8'))
for x in self.inputs + self.outputs:
up(x.abspath().encode('utf-8'))
up(x.path_from(src).encode('utf-8'))
self.uid_ = m.digest()
return self.uid_

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