Q: compile error

[kingjr]

Hi,

I'm stuck at the compile step. I run the command make and get

gcc -std=c99 -O3 -shared -o _layout.so layout.c
/usr/bin/ld: /tmp/ccbKpqJX.o: relocation R_X86_64_32 against `.rodata.str1.1' can not be used when making a shared object; recompile with -fPIC
/tmp/ccbKpqJX.o: error adding symbols: Bad value
collect2: error: ld returned 1 exit status
make: *** [_layout.so] Error 1

Any advice on how to proceed?

Thanks a lot!

[fogleman]

Add the -fPIC switch and try again.

[kingjr]

Thanks for this surprisingly quick response! Yes, I tried make --fPIC but got make: unrecognized option '--fPIC'.

I also did gcc -std=c99 -O3 -shared -o _layout.so layout.c -fPIC which seems to work (I don't know what to do with the other lines of Makefile). However, if I go to ipython and import layout, I still get:

Traceback (most recent call last)
<ipython-input-1-ef1e5c67b397> in <module>()
----> 1 import layout

~/GraphLayout/layout.py in <module>()
      1 from ctypes import CDLL, CFUNCTYPE, POINTER, Structure, c_float, c_int, byref
      2 
----> 3 dll = CDLL('_layout.so')
      4 
      5 MAX_EDGES = 128

~/anaconda/lib/python2.7/ctypes/__init__.pyc in __init__(self, name, mode, handle, use_errno, use_last_error)
    363 
    364         if handle is None:
--> 365             self._handle = _dlopen(self._name, mode)
    366         else:
    367             self._handle = handle

OSError: _layout.so: cannot open shared object file: No such file or directory

Which seems to suggests that the compilation didn't work?

Perhaps I'm looking in the wrong direction,

Thanks!

[fogleman]

Yeah, it's a single hyphen.

For the next error, try removing .so on this line:

https://github.com/fogleman/GraphLayout/blob/master/layout.py#L3

It's a Linux thing...

[kingjr]

For the next error, try removing .so on this line: https://github.com/fogleman/GraphLayout/blob/master/layout.py#L3 It's a Linux thing...

I'm on ubuntu indeed. But no this didn't fix it :/

----> 1 import layout

~/GraphLayout/layout.py in <module>()
      1 from ctypes import CDLL, CFUNCTYPE, POINTER, Structure, c_float, c_int, byref
      2 
----> 3 dll = CDLL('_layout')
      4 
      5 MAX_EDGES = 128

~/anaconda/lib/python2.7/ctypes/__init__.pyc in __init__(self, name, mode, handle, use_errno, use_last_error)
    363 
    364         if handle is None:
--> 365             self._handle = _dlopen(self._name, mode)
    366         else:
    367             self._handle = handle

OSError: _layout: cannot open shared object file: No such file or directory

[fogleman]

Might need to rename the _layout.so to _layout too? I have weird issues with the file extensions on Linux.

[kingjr]

Still not..