Re: Issue on X86_64?

[Lorenzo Pesce <lpesce@uchicago.edu>]

On Mar 28, 2008, at 12:45 PM, Andrew Haley wrote:

> Lorenzo Pesce wrote:
>> Thanks a lot for your kinds replied Andrew,
>>
>>>> However, when I get to X86 (whether Intel or AMD) it does not work
>>>> anymore. I can compile the files, and build the static library  
>>>> libroc.a.
>>>> It works fine and I can move it from AMD to intel (not the other  
>>>> way
>>>> around, but I assume it is a problem with my installation).  
>>>> However,
>>>> when I try to build a dynamically linked library, gcc complains  
>>>> that
>>>> "Relocation R_X86_64_32 against 'a local symbol' can not be used
>>>> when making a share object; recompile with -fPIC"
>>>> then it tells me it can't read symbols .o because it is a bad  
>>>> value.
>>>
>>> You need to compile everything that goes into a dynamically linked
>>> library with -fPIC.
>>
>> I have to admit my ignorance on compilers building, but once i
>> download unpack and so on the gcc compiler package, I can't
>> figure out in which of the hundreds of lines of the  various  
>> makefiles
>> or configuration files I should put the -fPIC flag.
>
> Don't mess with gcc's makefiles.
> gcc already builds all of its files correctly.
>
> When you use gcc to build *your* libraries, *you* must compile  
> everything
> with -fPIC.

I already do that. The problem is with libgfortran.* not with my  
libraries!

Java seems to need the object files from libgfortran for the JNI  
libraries to work properly so I need
libgfortran to be compiled with -fPIC to link them into the jni  
library. My libraries have always been built with -fPIC,
it is libgfortran that is breaking on the x86_64, not my libraries.

Does it make sense?

Lorenzo