Follow-up Comment #1, bug #27201 (project avr-libc):
The problem is that accessing the union (and also struct,
for byte-wide access) elements without naming the union
itself is a GCC extension, so it is turned off when compiling
with -std=c99.
It appears to me that prepending the entire union declaration
with __extension__ does fix it by telling GCC "It's OK to use
the following GCC extension here, regardless of the --std
option in effect".
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