libpng headaches!
Hello dear Cygwin users, I hope I'm posting this to the right list. If not, then I sincerely apologize! I'm programming a game using SDL and I compile with gcc under Cygwin and link with the mingw libraries. I've done this for years, and it has worked fine all the time. But a short time ago I wanted to start using libpng for my project. And this is where the nightmare starts When I try to build my game with -lpng12 and -lz I get these two errors: undefined reference to `_setjmp' And: undefined reference to `__imp___ctype_' The last one occurs on a line in my code that calls toupper() or tolower(). I've been trying to research this as good as I can, and I've found some posts here and there with other people having similar problems. It appears as if libpng refuses to compile under Cygwin? For example, this is a comment I found at the OpenTTD website: [...] at the moment I am not sure how to do this because the PNG packages for Cygwin don't work (you can include libpng and it's development headers and manually edit the Makefile.config to make it compile but it fails at linkage with undefined reference to __setjmp errors). I guess the question I'd like to have answered is, what am I doing wrong? Thank you! Best regards David Karlgren -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: libpng headaches!
David Karlgren wrote: Hello dear Cygwin users, I hope I'm posting this to the right list. If not, then I sincerely apologize! I'm programming a game using SDL and I compile with gcc under Cygwin and link with the mingw libraries. So you're really using MinGW then. The MinGW list would be the appropriate place to look for help with this problem. -- Larry Hall http://www.rfk.com RFK Partners, Inc. (508) 893-9779 - RFK Office 216 Dalton Rd. (508) 893-9889 - FAX Holliston, MA 01746 _ A: Yes. Q: Are you sure? A: Because it reverses the logical flow of conversation. Q: Why is top posting annoying in email? -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: libpng headaches!
Larry Hall (Cygwin) wrote: David Karlgren wrote: Hello dear Cygwin users, I hope I'm posting this to the right list. If not, then I sincerely apologize! I'm programming a game using SDL and I compile with gcc under Cygwin and link with the mingw libraries. So you're really using MinGW then. The MinGW list would be the appropriate place to look for help with this problem. And the problem is presumably caused by trying to use the Cygwin version of libpng-devel, which will have references to functions supplied by the Cygwin DLL, when linking against MinGW runtime libs, which don't supply the same set of functions. The problem with -lz could probably be fixed by using the mingw-zlib package, but David will need to find a proper MinGW build of libpng (or roll his own). cheers, DaveK -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: libpng headaches!
Larry Hall (Cygwin) wrote: David Karlgren wrote: Hello dear Cygwin users, I hope I'm posting this to the right list. If not, then I sincerely apologize! I'm programming a game using SDL and I compile with gcc under Cygwin and link with the mingw libraries. So you're really using MinGW then. The MinGW list would be the appropriate place to look for help with this problem. Yes, I guess you're right. I was only using what was included with the Cygwin distribution, and I sort of figured they belonged to each other. But now I know where I should go from here. Thank you! Best regards David Karlgren -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
