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2a23247420
Prior versons of the GCC warned about the 'dest' parameter of contrib/tools/pngcp.c not being volatile, which isn't necessary because it isn't modified. This removes the GCC specific fixup. The function which calls setjmp, cppng() also relied on undefined behavior because it assigned the result of setjmp() to a variable; this is not one of the four uses of setjmp permitted by ANSI-C. This passes the result previously returned by longjmp via (struct display). It's very very unlikely that any compiler could have got the code wrong but it is technically undefined.
This "contrib" directory contains contributions which are not necessarily under the libpng license, although all are open source. They are not part of libpng proper and are not used for building the library, although some are used for testing the library via "make check".