I came across a peculiar behavior while working with make. If it is expected behavior, it would be worth documenting. If it is not, a bug should be filed.
The following variable will never receive its default assignment: # Set default for foo export foo foo ?= 5 It would appear that the export directive causes variables to be defined with an empty value, which renders the ?= assignment useless. However, the following works fine: # Set default for foo export foo ?= 5 This may be common knowledge for some folks, but I struggled with it for a while. I believe it would be worth noting in section 5.7.2 and/or 6.2 of the make manual. Thanks - Sean Mahnken
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