When compiling with pedantic the following warning is seen:
gcc -Wall -pedantic -O0 -o test test.c
In file included from test.c:3:0:
/path/inet/netinet/in.h:111:21: warning: comma at end of \
enumerator list [-Wpedantic]
IPPROTO_MH = 135, /* IPv6 mobility header. */
^
It is valid C99 to have a trailing comma after the last item in
an enumeration. However it is not valid C90. If possible glibc
attempts to keep all headers C90 + long long without requiring
C99 features. In this case it's easy to fix the headers and it
removes the warning seem with -pedantic.
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