Hi, I'm wondering why GCC is giving a warning "operation on 'c' may be undefined"? Here's the code: #define MAX_CHAR(data, accum) ((255 - (data)) > (accum)) ? ((accum) + (data)) : 255 uchar *c; uchar accum c = out_pix + (voffset - *cp++)*out_rowstride; *c++ = MAX_CHAR(*c, accum); ///<------------- warning on this line This is in a C file with gcc -v Using built-in specs. Target: i686-apple-darwin8 Configured with: /private/var/tmp/gcc/gcc-5367.obj~1/src/configure --disable-checking -enable-werror --prefix=/usr --mandir=/share/man --enable-languages=c,objc,c++,obj-c++ --program-transform-name=/^[cg][^.-]*$/s/$/-4.0/ --with-gxx-include-dir=/include/c++/4.0.0 --with-slibdir=/usr/lib --build=powerpc-apple-darwin8 --with-arch=nocona --with-tune=generic --program-prefix= --host=i686-apple-darwin8 --target=i686-apple-darwin8 Thread model: posix gcc version 4.0.1 (Apple Computer, Inc. build 5367) Any ideas? Thanks, wes
