I have an Audio Unit project which uses a BSD dynamic library and a
Cocoa framework to provide common services to a collection of plug-ins.
Up to now this has worked fine. Yesterday I installed Xcode 2.0, and
now it refuses to link targets of either of these types.
+ I tried with the existing dynamic library and framework, in a project
imported from XCode 1.5. I also tried a dummy brand new dynamic
library
target created in XCode 2.0. This produced the same result,
suggesting
that it's not down to a failure to update target settings.
+ The diagnostic is always:
ld: /Users/ian/FD Synthesiser/build/FD Synthesiser.build/FDS
Library.build/Objects-normal/ppc/plugins.o has local relocation
entries in non-writable section (__TEXT,__text)
where "plugins.o" is always the first module in the link list.
+ I get the same result whether I build with GCC 3.3 or GCC 4.0
+ A trivial library containing one module, and one function, such as:
int snafu (void) { return (42); }
will link without problems. I suspect the problem is the presence of
any external reference in the module - so adding "#import <Carbon/
Carbon.h>
to the above module is enough to trigger the problem.
I'm about to try going back to XCode 1.5, so I' afraid I won't be
able to try any experiments to narrow this down, but if anyone has a
definitive fix I'd be pleased to hear it.
------------
Later:-
It appears that supplying the linker flag "-read_only_relocs
suppress" is a workaround for this problem. But I still don't know
whether this is just a feature of all dynamic libraries that someone
has decided should now be an error condition, or whether the compiler
has started generating different code.
This may or may no be related, but it also seems that XCode will
always pass -mdynamic_no_pic to the compiler, even if your target
inspector's "Build" pane shows that you've asked it not to.
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