Apparent cffi bug

mylib.c

#include <stdlib.h>
#include <stdio.h>
#include "mylib.h"

/* initialize the array with integers 0...length */
void initialize_MyArray(MyArray* a, long length){
    a->length = length;
    a->arr = (int*)malloc(length * sizeof(int));
    int i;
    for(i=0; i<length; i++){
        a->arr[i] = i;
    }
}

/* free the memory when finished */
void deallocate_MyArray(MyArray* a){
    free(a->arr);
    a->arr = NULL;
}

/* tools to print the array */
char* stringify(MyArray* a, int nmax){
    char* output = (char*) malloc(nmax * 20);
    int pos = sprintf(&output[0], "[");

    int k;
    for (k=0; k < a->length && k < nmax; k++){
        pos += sprintf(&output[pos], " %d", a->arr[k]);
    }
    if(a->length > nmax)
        pos += sprintf(&output[pos], "...");
    sprintf(&output[pos], " ]");
    return output;
}

void print_MyArray(MyArray* a, int nmax){
    char* s = stringify(a, nmax);
    printf("%s", s);
    free(s);
}

mylib.h

typedef struct {
    int* arr;
    long length;
} MyArray;

void initialize_MyArray(MyArray* a, long length);

void deallocate_MyArray(MyArray* a);

char* stringify(MyArray* a, int nmax);

void print_MyArray(MyArray* a, int nmax);

output

╰─➤  ./test.py 
__pycache__/_cffi__xd2227dcfx6cd0d953.c:158:34: error: unknown type name ‘MyArray’
 static void _cffi_check__MyArray(MyArray *p)
                                  ^
__pycache__/_cffi__xd2227dcfx6cd0d953.c: In function ‘_cffi_layout__MyArray’:
__pycache__/_cffi__xd2227dcfx6cd0d953.c:167:10: error: unknown type name ‘MyArray’
   struct _cffi_aligncheck { char x; MyArray y; };
          ^
__pycache__/_cffi__xd2227dcfx6cd0d953.c:169:12: error: ‘MyArray’ undeclared (first use in this function)
     sizeof(MyArray),
            ^
__pycache__/_cffi__xd2227dcfx6cd0d953.c:169:12: note: each undeclared identifier is reported only once for each function it appears in
In file included from __pycache__/_cffi__xd2227dcfx6cd0d953.c:3:0:
__pycache__/_cffi__xd2227dcfx6cd0d953.c:171:14: error: expected specifier-qualifier-list before ‘MyArray’
     offsetof(MyArray, arr),
              ^
__pycache__/_cffi__xd2227dcfx6cd0d953.c:172:23: error: expected expression before ‘)’ token
     sizeof(((MyArray *)0)->arr),
                       ^
In file included from __pycache__/_cffi__xd2227dcfx6cd0d953.c:3:0:
__pycache__/_cffi__xd2227dcfx6cd0d953.c:173:14: error: expected specifier-qualifier-list before ‘MyArray’
     offsetof(MyArray, length),
              ^
__pycache__/_cffi__xd2227dcfx6cd0d953.c:174:23: error: expected expression before ‘)’ token
     sizeof(((MyArray *)0)->length),
                       ^
__pycache__/_cffi__xd2227dcfx6cd0d953.c:179:3: warning: implicit declaration of function ‘_cffi_check__MyArray’ [-Wimplicit-function-declaration]
   _cffi_check__MyArray(0);
   ^
__pycache__/_cffi__xd2227dcfx6cd0d953.c: In function ‘_cffi_f_deallocate_MyArray’:
__pycache__/_cffi__xd2227dcfx6cd0d953.c:185:3: error: unknown type name ‘MyArray’
   MyArray * x0;
   ^
__pycache__/_cffi__xd2227dcfx6cd0d953.c:201:3: warning: implicit declaration of function ‘deallocate_MyArray’ [-Wimplicit-function-declaration]
   { deallocate_MyArray(x0); }
   ^
__pycache__/_cffi__xd2227dcfx6cd0d953.c: In function ‘_cffi_f_initialize_MyArray’:
__pycache__/_cffi__xd2227dcfx6cd0d953.c:212:3: error: unknown type name ‘MyArray’
   MyArray * x0;
   ^
__pycache__/_cffi__xd2227dcfx6cd0d953.c:238:3: warning: implicit declaration of function ‘initialize_MyArray’ [-Wimplicit-function-declaration]
   { initialize_MyArray(x0, x1); }
   ^
__pycache__/_cffi__xd2227dcfx6cd0d953.c: In function ‘_cffi_f_print_MyArray’:
__pycache__/_cffi__xd2227dcfx6cd0d953.c:249:3: error: unknown type name ‘MyArray’
   MyArray * x0;
   ^
__pycache__/_cffi__xd2227dcfx6cd0d953.c:275:3: warning: implicit declaration of function ‘print_MyArray’ [-Wimplicit-function-declaration]
   { print_MyArray(x0, x1); }
   ^
Traceback (most recent call last):
  File "/home/alendit/anaconda/envs/numba/lib/python3.3/distutils/unixccompiler.py", line 116, in _compile
    extra_postargs)
  File "/home/alendit/anaconda/envs/numba/lib/python3.3/distutils/ccompiler.py", line 909, in spawn
    spawn(cmd, dry_run=self.dry_run)
  File "/home/alendit/anaconda/envs/numba/lib/python3.3/distutils/spawn.py", line 32, in spawn
    _spawn_posix(cmd, search_path, dry_run=dry_run)
  File "/home/alendit/anaconda/envs/numba/lib/python3.3/distutils/spawn.py", line 163, in _spawn_posix
    % (cmd[0], exit_status))
distutils.errors.DistutilsExecError: command 'gcc' failed with exit status 1

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/alendit/anaconda/envs/numba/lib/python3.3/site-packages/cffi/ffiplatform.py", line 47, in _build
    dist.run_command('build_ext')
  File "/home/alendit/anaconda/envs/numba/lib/python3.3/distutils/dist.py", line 949, in run_command
    cmd_obj.run()
  File "/home/alendit/anaconda/envs/numba/lib/python3.3/distutils/command/build_ext.py", line 353, in run
    self.build_extensions()
  File "/home/alendit/anaconda/envs/numba/lib/python3.3/distutils/command/build_ext.py", line 462, in build_extensions
    self.build_extension(ext)
  File "/home/alendit/anaconda/envs/numba/lib/python3.3/distutils/command/build_ext.py", line 517, in build_extension
    depends=ext.depends)
  File "/home/alendit/anaconda/envs/numba/lib/python3.3/distutils/ccompiler.py", line 574, in compile
    self._compile(obj, src, ext, cc_args, extra_postargs, pp_opts)
  File "/home/alendit/anaconda/envs/numba/lib/python3.3/distutils/unixccompiler.py", line 118, in _compile
    raise CompileError(msg)
distutils.errors.CompileError: command 'gcc' failed with exit status 1

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "./test.py", line 22, in <module>
    main()
  File "./test.py", line 17, in main
    lib = ffi.verify(sources=['mylib.c'], include_dirs=['.'])
  File "/home/alendit/anaconda/envs/numba/lib/python3.3/site-packages/cffi/api.py", line 339, in verify
    lib = self.verifier.load_library()
  File "/home/alendit/anaconda/envs/numba/lib/python3.3/site-packages/cffi/verifier.py", line 74, in load_library
    self._compile_module()
  File "/home/alendit/anaconda/envs/numba/lib/python3.3/site-packages/cffi/verifier.py", line 139, in _compile_module
    outputfilename = ffiplatform.compile(tmpdir, self.get_extension())
  File "/home/alendit/anaconda/envs/numba/lib/python3.3/site-packages/cffi/ffiplatform.py", line 25, in compile
    outputfilename = _build(tmpdir, ext)
  File "/home/alendit/anaconda/envs/numba/lib/python3.3/site-packages/cffi/ffiplatform.py", line 50, in _build
    raise VerificationError('%s: %s' % (e.__class__.__name__, e))
cffi.ffiplatform.VerificationError: CompileError: command 'gcc' failed with exit status 1
(numba)╭─alendit@alendit-UX31A ~/numba/buffer  ‹master*› 
╰─➤  python --version                                                                                                                                                                                                                      
Python 3.3.5 :: Continuum Analytics, Inc.

test.py

#!/usr/bin/env python
from cffi import FFI

def main():
    ffi = FFI()
    ffi.cdef("""typedef struct {
    int* arr;
    long length;
    } MyArray;
    
    void initialize_MyArray(MyArray* a, long length);
    
    void deallocate_MyArray(MyArray* a);
    
    void print_MyArray(MyArray* a, int nmax);
    """)
    lib = ffi.verify(sources=['mylib.c'], include_dirs=['.'])



if __name__ == "__main__":
    main()

test_working.py

#!/usr/bin/env python
from cffi import FFI

def main():
    ffi = FFI()
    ffi.cdef("""typedef struct {
    int* arr;
    long length;
    } MyArray;
    
    void initialize_MyArray(MyArray* a, long length);
    
    void deallocate_MyArray(MyArray* a);
    
    void print_MyArray(MyArray* a, int nmax);
    """)
    lib = ffi.verify(open("mylib.c", "r").read(), include_dirs=['.'])



if __name__ == "__main__":
    main()