Wednesday, February 22, 2012

Firebird V2.0.7

We are currently preparing to release Firebird 2.0.7, since I take responsibility for the Mac builds, I did a 2.0.7 build on MacOSX 10.7 using the development tools installed by XCode 4.1 (gcc 4.2.1 etc). I set up the relevant environment variables for this older 32bit only build CFLAGS, CXXFLAGS, LD_FLAGS and also set the MACOSX_DEPLOYMENT_TARGET=10.4. The builds completed without any problems, some simple tests on MacOSX 10.7 showed no problems.

Now - Imagine my surprise when Philippe told me that when he tried to QA the builds on MacOSX 10.5 we got this error on SuperServer startup.

Process: fbserver [623]
Identifier: fbserver
Version: ??? (???)
Code Type: X86 (Native)
Parent Process: fbguard [310]

Date/Time: 2012-02-09 09:42:13.939 +0100
OS Version: Mac OS X 10.5.8 (9L31a)
Report Version: 6
Anonymous UUID: FA7F8C0C-581B-4153-ADBE-2BCB59C5F823

Exception Codes: 0x0000000000000002, 0x0000000000000000
Crashed Thread: 0

Dyld Error Message:
Symbol not found: ___moddi3
Referenced from:
Expected in: /usr/lib/libSystem.B.dylib

A simple nm and grep shows the following for the 10.5 libSystem.B.dylib

nm /usr/lib/libSystem.B.dylib | grep moddi3
00083490 t ___moddi3
0003df70 t ___umoddi3

On 10.5 ___moddi3 is defined in libgcc_s.1.dylib which links to libsystem.B.dylib

From what I can gather these *moddi3 symbols are routines for doing 64bit maths on 32bit systems.

However the same on 10.7 returns nothing, however the symbols can be found in libgcc_s.10.5.dylib which does not link to libgcc_s.1.dylib hence the missing symbols message.

Supposedly this can be fixed by linking explicity to to libgcc_s.10.5.dylib
using -lgcc_s.10.5. I got round it by booting up my copy of Snow Leopard (10.6) and
building Firebird 2.0.7 there instead of on MacOSX 10.7

So basically if you want to buld an application that is deployable on 10.5 or less, you can't - unless you know how to get around the above problem. Its as if although you can build 32bit applications for 32bit versions of MacOSX, they won't run, because they are incompatible with any version of the OS less than 10.6.


Maury Markowitz said...

I'm sorry to write directly, but I'm not sure where else to turn.

I'm trying to build the ODBC driver on 10.7. There are no instructions, and nothing but failure reports in the small number of attempts in the mailing lists.

So I'm muddling my way through. Have you succeeded? Should I continue my muddling? Or is this hopeless?

Paul Beach said...

I haven't tried to build the ODBC driver on MacOS, mainly because nobody has asked me for it. However it should be possible. Contact me directly via my email address on te contacts page at and we can see what can be done.
Paul Beach

mhubig said...

Hi Paul, I'm trying to build FB 2.0.7 on Mac OS X 10.8.2, but I've no look. Can you please post the commands you used to build it?

Cheers, Markus

Paul Beach said...

Markus, Please email me with your problem, you can find my address on the contacts page at