Comments on: Compiling MySQL UDFs on Mac OS X

By: byte

byte — Tue, 06 Oct 2009 05:19:45 +0000

Hi Bejamin!

Thanks. It looks like bundle_loader makes things much better :)

Quick testing on a few UDFs I had handy:
g++ -Wall -bundle -bundle_loader /usr/local/mysql/bin/mysqld -o udf_return_values.so `/usr/local/mysql/bin/mysql_config --cflags` udf_return_values.c

By: Anonymous

Anonymous — Sat, 16 May 2009 16:03:50 +0000

I realize this is year old, but wanted to express my gratitude for the helpful article; I was wondering what the hell I was doing wrong on my Mac OS X where documentation isn’t as plentiful as it is on *nix.

Just one minor correction- your instruction had one dash for cflags; in my case, it doesn’t work; I had to use two dashes.

echo `/usr/local/mysql/bin/mysql_config -cflags`
returns the sample usage page for this script while this
echo `/usr/local/mysql/bin/mysql_config –cflags`
will return the correct include directory path and flags needed to compile

I’d also encourage you to post something over at MySQL’s documentation, even just a link back to this page for the UDF installation on Mac OS X.

Again, thanks!

By: byte

byte — Mon, 14 Apr 2008 16:30:18 +0000

When time permits, must figure out why using g++ generates a “bigger” .so over using gcc (it really shouldn’t make a difference)

-rwxr-xr-x 1 root wheel 8616 Apr 14 09:16 /usr/local/mysql/lib/udf_return_values.so*
-rwxr-xr-x 1 ccharles staff 8568 Apr 14 09:25 udf_return_values.so*

8616 (g++) vs 8568 (gcc)

By: byte

byte — Mon, 14 Apr 2008 16:19:38 +0000

Hi Bejamin!

Thanks. It looks like bundle_loader makes things much better :)

Quick testing on a few UDFs I had handy:
g++ -Wall -bundle -bundle_loader /usr/local/mysql/bin/mysqld -o udf_return_values.so `/usr/local/mysql/bin/mysql_config –cflags` udf_return_values.c

By: Benjamin Reed

Benjamin Reed — Mon, 14 Apr 2008 15:31:26 +0000

If you get linker errors, it might be that it expects certain runtime symbols to exist which come from the mysql binary itself. If you want it to properly resolve all symbols at link-time, you should be able to use the -bundle_loader flag. Also, if it’s a loadable module that’s going to be dlopened by MySQL, it’s technically more “correct” to make it a -bundle, not a -dynamiclib.

Try something like this (I can’t test it since I don’t have any udf sources handy):

g++ -Wall -bundle -bundle_loader /usr/local/mysql/bin/mysqld -o udf_lightspeed.so `/usr/local/mysql/bin/mysql_config –cflags` udf_lightspeed.c

You might need to add `/usr/local/mysql/bin/mysql_config –libmysqld-libs` to that as well to resolve libmysqld symbols.