Question

I’m trying to use libjasper from http://www.ece.uvic.ca/~frodo/jasper/ as a static library in compiling dcraw.c from http://www.cybercom.net/~dcoffin/dcraw/ on windows with VC9. I have resolved several issues on the way and finally get three linking errors.

1>dcraw.obj : error LNK2001: unresolved external symbol _ftello
1>dcraw.obj : error LNK2001: unresolved external symbol _fseeko
1>dcraw.obj : error LNK2001: unresolved external symbol _getc_unlocked

the first two of these are easily resolved it seems, I added

#define fseeko _fseeki64
#define ftello _ftelli64

and that does it but what about the third one:

1>dcraw.obj : error LNK2001: unresolved external symbol _getc_unlocked

How can I work around that on windows with visual studio?

Thanks.

Answer 1

The actual equivalent of getc_unlocked is not getc, it’s _fgetc_nolock. So, assuming that whoever wrote the original code knew what he’s doing and had some reasons to prefer the thread-unsafe version, you probably want this:

#define getc_unlocked _fgetc_nolock