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Carlo Bramini 2010-01-27 10:06:17 PST When building third party software powered by libtool (like xine-lib and several others) under Mingw+MSys, libSDL fails to link. I got this message when building SDL video out component of xine-lib: *** Warning: linker path does not have real file for library -lmingw32. *** I have the capability to make that library automatically link in when *** you link to this library. But I can only do this if you have a *** shared version of the library, which you do not appear to have *** because I did check the linker path looking for a file starting *** with libmingw32 and none of the candidates passed a file format test *** using a file magic. Last file checked: /mingw/lib/libmingw32.a Apparently there is no need to manually add -lmingw32 for making libSDL working. If this flag is removed, everything is built without troubles. If it has been added for fixing a cross-compiler, perhaps if would be a better idea to adjust its SPECS file in the same manner it has been done in the true one used by mingw on Windows (I'm just guessing why it exists here). There is also another message received on the console: *** Warning: linker path does not have real file for library -lSDLmain. *** I have the capability to make that library automatically link in when *** you link to this library. But I can only do this if you have a *** shared version of the library, which you do not appear to have *** because I did check the linker path looking for a file starting *** with libSDLmain and none of the candidates passed a file format test *** using a file magic. Last file checked: /mingw/lib/libSDLmain.a This message, like previous one, is caused by -no-undefined flag sent to libtool when building shared libraries. Actually adding an .la file with its dependencies solves the troubles, so I believe it would be better to create it too in the build process of libSDL. --HG-- branch : SDL-1.2
Simple DirectMedia Layer
(SDL)
Version 1.2
---
http://www.libsdl.org/
This is the Simple DirectMedia Layer, a general API that provides low
level access to audio, keyboard, mouse, joystick, 3D hardware via OpenGL,
and 2D framebuffer across multiple platforms.
The current version supports Linux, Windows CE/95/98/ME/XP/Vista, BeOS,
MacOS Classic, Mac OS X, FreeBSD, NetBSD, OpenBSD, BSD/OS, Solaris, IRIX,
and QNX. The code contains support for Dreamcast, Atari, AIX, OSF/Tru64,
RISC OS, SymbianOS, Nintendo DS, and OS/2, but these are not officially
supported.
SDL is written in C, but works with C++ natively, and has bindings to
several other languages, including Ada, C#, Eiffel, Erlang, Euphoria,
Guile, Haskell, Java, Lisp, Lua, ML, Objective C, Pascal, Perl, PHP,
Pike, Pliant, Python, Ruby, and Smalltalk.
This library is distributed under GNU LGPL version 2, which can be
found in the file "COPYING". This license allows you to use SDL
freely in commercial programs as long as you link with the dynamic
library.
The best way to learn how to use SDL is to check out the header files in
the "include" subdirectory and the programs in the "test" subdirectory.
The header files and test programs are well commented and always up to date.
More documentation is available in HTML format in "docs/index.html", and
a documentation wiki is available online at:
http://www.libsdl.org/cgi/docwiki.cgi
The test programs in the "test" subdirectory are in the public domain.
Frequently asked questions are answered online:
http://www.libsdl.org/faq.php
If you need help with the library, or just want to discuss SDL related
issues, you can join the developers mailing list:
http://www.libsdl.org/mailing-list.php
Enjoy!
Sam Lantinga (slouken@libsdl.org)