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How do I use extern to share variables between source files?
...est size of any common blocks.
Note that GCC 10.1.0, which was released on 2020-05-07, changes the
default compilation options to use
-fno-common, which means
that by default, the code above no longer links unless you override the
default with -fcommon (or use attributes, etc — see the link).
The...