Exactly what it says: no previous prototype. A prototype in C is a declaration of function signature.

Look at this, as Sjoerd already pointed out: http://dev.monetdb.org/hg/MonetDB-extend/file/tip/reverse/reverse.c

at lines 77 and 78

On 31 March 2016 at 14:49, Shmagi Kavtaradze <kavtaradze.s@gmail.com> wrote:

I use two versions of Monetdb. 1 is PythonUDF and another Monetdb 11.21.13. Function "bitand" is compiled and used well in Monetdb, but when I try to compile PythonUDF it gives me errors:

udf.c:14:1: error: no previous prototype for 'UDFbitand' [-Werror=missing-prototypes]
UDFbitand(flt *ret, lng*a, lng *b)
^
cc1: all warnings being treated as errors
Makefile:876: recipe for target 'lib_udf_la-udf.lo' failed

any ideas? thanks in advance.

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