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build.plat: allow (easily) overriding with an empty string on Windows.

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This commit is contained in:
whitequark 2019-06-04 11:33:51 +00:00
parent 39ca0e6fa6
commit 1d3e9c8331
1 changed files with 5 additions and 1 deletions
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6
nmigen/build/plat.py
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@ -222,7 +222,11 @@ class TemplatedPlatform(Platform):
def get_override(var): def get_override(var):
var_env = "NMIGEN_{}".format(var) var_env = "NMIGEN_{}".format(var)
if var_env in os.environ: if var_env in os.environ:
return os.environ[var_env] # On Windows, there is no way to define an "empty but set" variable; it is tempting
# to use a quoted empty string, but it doesn't do what one would expect. Recognize
# this as a useful pattern anyway, and treat `set VAR=""` on Windows the same way
# `export VAR=` is treated on Linux.
return re.sub(r'^\"\"$', "", os.environ[var_env])
elif var in kwargs: elif var in kwargs:
return kwargs[var] return kwargs[var]
else: else: