The following command compiles a simple Hello world program (yes, I want to include mysql):
gcc Source.m -lobjc -lpthread -lmysqlclient -lz -L/usr/local/lib/mysql
The following GNUmakefile compiles the same file, but application crashes. It started to crash, when I added mysql to GNUmakefile:
----- include ${GNUSTEP_MAKEFILES}/common.make
ADDITIONAL_OBJCFLAGS= -Wno-import -Wall
TOOL_NAME = app app_OBJC_FILES = Source.m app_INCLUDE_DIRS = -I/usr/local/include/mysql app_TOOL_LIBS = -lecgi -lmysqlclient -lz app_LIB_DIRS = -L/usr/local/lib/mysql
include ${GNUSTEP_MAKEFILES}/tool.make -----
Error message:
Bus error (core dumped)
Another problem is that I have no clue what kind of command line GNUmakefile generates.
I had a similar crash with mysqlclient. My problem was, that libobjc and libmysqlclient both export hash_next functions and the libobjc was calling into the mysql version during class initialization. You could either "work around" this by ordering the linked libraries in way that happens to work (I don't know whether this can be done with gnustep-make) or you can try creating another C wrapper library for mysqlclient and avoid linking -lobjc and -lmysqlclient in the same executable which seems to work around the issue for us currently.
GCC 4.0 will call new objc_ prefixed hash functions but even 4.1 will probably still have the original version for binary compatibility, so you still run the risk that the mysqlclient may call into the objc version :-/.
If you have the possibility of building your own libobjc then you could apply similar patches and remove the non-prefixed versions.
For more information see:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19024
Cheers, David Ayers
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