Re: libs-base fails to compile on OpenBSD

[Wolfgang Lux]

Hi Riccardo,

> The base configure script reports:
> 
> checking the Objective-C runtime... GNU
> checking for custom shared objc library... NONE
> checking objc/runtime.h usability... yes
> checking objc/runtime.h presence... yes
> checking for objc/runtime.h... yes
> checking objc/objc.h usability... yes
> checking objc/objc.h presence... yes
> checking for objc/objc.h... yes
> 
> 
> checking whether objc really works... yes
> checking if the compiler supports -fconstant-string-class... yes
> checking if +load method is executed before main... yes
> checking for objc_sync_enter... no
> checking for objc_setProperty... no
> checking for _Block_copy... no
> checking for objc_setUncaughtExceptionHandler() in runtime... no
> checking for objc_set_unexpected() in runtime... no
> checking for _objc_unexpected_exception in runtime... no
> configure: Disabling native Objective-C exceptions because the ObjC runtime
> configure: has no way to set an uncaught exception handler.  Please install
> configure: a recent Objective-C runtime if you want to use them.
> checking whether to enable native Objective-C exceptions... no
> checking for objc_sync_enter... (cached) no
> 
> 
> this looks all correct? However, afterwards it fails as we had past month:
> 
>  Compiling file runtime.c ...
> runtime.c:35:27: fatal error: objc/objc-api.h: No such file or directory
>  #include <objc/objc-api.h>
>                            ^
> compilation terminated.
> 
> 
> You suggested this all should not be built at all, but which test is getting 
> confused?

Looking at Source/GNUmakefile in base (at the very end) the ObjectiveC2 
subproject, which is where runtime.c lives, is built only when the OBJC2RUNTIME 
makefile variable is set to 0 (meaning that you only have an old Objective-C 
runtime system, or rather the configure script was not able to identify your 
runtime system as being compatible with the newer runtime system):
  ifeq ($(OBJC2RUNTIME),0)
  SUBPROJECTS = ObjectiveC2
  endif

Going back to configure.ac then, OBJC2RUNTIME is set according to the presence 
of objc_setProperty. So the problem is this test:
  checking for objc_setProperty... no

Wolfgang