2013/11/8 Peter Rosin <p...@lysator.liu.se> > On 2013-11-08 12:18, Panicz Maciej Godek wrote: > > 2013/11/8 Peter Rosin <p...@lysator.liu.se <mailto:p...@lysator.liu.se>> > > > > The SDL library, for some obscure reason, has its own special > > take on that and prescribes that you should keep using main() >
> > even if you are doing a GUI app. I think the SDLmain library > > contains the real WinMain@16 entry point and that entry point > > in turn calls the application main function. Or I should perhaps > > say SDL_main (see that -Dmain=SDL_main define above). > > Some part of this fragile SDL crap fails. I don't know what. > > > > Perhaps the SDL_main library was compiled to expect an > > ordinary main entry point instead of the GUI WinMain@16 version? > > > > Just to be clear, I'm not an SDL user. This is just my > > understanding of this. > > The above description might very well be flawed in some way, but SDL > > initialization is peculiar. > > > > > > I can later try to add some of the options from the libtool > > invocation generated by autoconf to my invocation of gcc to see > > which particular option causes the failure and then let you know. > > I think that your description of the way SDL does things on mingw > > is sound (and I think that the goal is to ensure portability, as > > unix programmers have no idea what the WinMain is) > > Hmmm, I have this hunch that the -nostdlib option that libtool adds to the > g++ invocation beats -mwindows, just like it beats -pthread. But I don't > know that for a fact... I just made the following test: I removed the mediation of libtool and called g++ directly, with the same flags, i.e. g++ -D_GNU_SOURCE=1 -Dmain=SDL_main -Ic:/mingw/msys/1.0/include/SDL -Ic:/mingw/msys/1.0/include/guile/2.0 -I/usr/local/include -Ic:/mingw/msys/1.0/include -Wall -Werror -g -O2 -o slayer.exe file.o font.o image.o input.o slayer.o symbols.o video.o -mwindows -Lc:/mingw/msys/1.0/lib -lmingw32 -lSDLmain -lSDL -Lc:/mingw/msys/1.0/lib -lguile-2.0 -lgc -mwindows -Lc:/mingw/msys/1.0/lib -lSDL_image -lmingw32 -lSDLmain -lSDL -lSDL_ttf (the initial part, "/bin/sh ../libtool --tag=CXX --mode=link", was removed) and it got linked with no complaints. I then removed both -mwindows flags from the above invocation, and it did work as well. So plainly it looks as if there was some problem with libtool on MinGW. Unfortunately, I'm not a shell scripting master, so I can't say exactly which command libtool uses to link the program and how it is invoked.
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