DYLD_FALLBACK_LIBRARY_PATH changed in OpenJDK (was Re: How to load dylib on Mac?)

[Max (Weijun) Wang]

In fact, why is DYLD_FALLBACK_LIBRARY_PATH updated in src/solaris/bin/ 
java_md.c? Why not DYLD_LIBRARY_PATH?

DYLD_LIBRARY_PATH should be preferred than DYLD_FALLBACK_LIBRARY_PATH.  
If the libjpeg.dylib is in DYLD_LIBRARY_PATH, it will be loaded  
instead of /usr/lib/libjpeg.dylib.

Thanks
Max


On Jul 24, 2009, at 4:52 PM, Weijun Wang wrote:

> Hi All
>
> I've found something new.
>
> It seems the dlopen() function in Mac is quite normal, but there are
> some problem inside OpenJDK.
>
> I'm calling dlopen("libkrb5.dylib", RTLD_NOW) inside OpenJDK now and  
> it
> returns NULL. However, if I manually set DYLD_LIBRARY_PATH or
> DYLD_FALLBACK_LIBRARY_PATH to /usr/lib, then it works.
>
> So I printf the DYLD_FALLBACK_LIBRARY_PATH value, it is changed to
> something like jre/lib/i386:jre/lib:jre/../lib/i386. According to  
> Apple
> doc, the default value of it should ~/lib:/usr/lib:/usr/local/lib. If
> OpenJDK wants to change it to something else, shouldn't it append the
> new value onto the old one?
>
> So I suggest making these changes:
>
> --- a/src/solaris/bin/java_md.c
> +++ b/src/solaris/bin/java_md.c
> @@ -443,6 +443,9 @@
>        * variable.
>        */
>       runpath = getenv(LD_LIBRARY_PATH);
> +#ifdef __APPLE__
> +      if (!runpath) runpath = "/usr/local/lib:/usr/lib";
> +#endif
> #endif /* __solaris__ */
>
> #if defined(__linux__) || defined(_ALLBSD_SOURCE)
>
> Yes, the default runpath should also include "~/lib", omitted here for
> brevity.
>
> Thanks
> Max
>
>
> Max (Weijun) Wang wrote:
>> Hi All
>>
>> I'm totally new to C programming on Mac.
>>
>> On other systems I can call dlopen("libkrb5.so", RTLD_NOW) to  
>> return a
>> non-NULL pointer to the library. However, on Mac,
>> dlopen("libkrb5.dylib", RTLD_NOW) returns NULL even if I can see  
>> the /
>> usr/lib/libkrb5.dylib is right there. What's wrong here?
>>
>> Also, is there a way to write a cross-platform call? Say,
>> dlopen_smart("krb5")?
>
> I've found the JNI_LIB_NAME() macro. Nice.
>
>>
>> Thanks
>> Max
>>
>>
>