begin Daniel Phillips > On Wednesday 08 January 2003 21:14, Peter Jay Salzman wrote:
sdl newbie alert. i’m getting the following warnings:
warning: passing arg 2 of SDL_MapRGB' with different width due to prototype warning: passing arg 3 ofSDL_MapRGB’ with different width due
to prototype warning: passing arg 4 of `SDL_MapRGB’ with different width
due to prototype
from this line of code:
Uint32 white = SDL_MapRGB(screen->format, 255, 255, 255);
There is nothing wrong with that line of code. It does not cause a warning
here (gcc 2.95.4). Which compiler?
hi daniel,
aiieee. mea culpa! sometimes i forget the fact that the entire world
doesn’t use GNU/linux. sorry about that.
i’m on a linux box, and the error happens with both gcc-2.95 and
gcc-3.0.
here is the makefile:
WARN = -Wall -W -Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations
-Wtraditional -Wshadow -Wpointer-arith -Wcast-qual -Winline -Wredundant-decls
-Wconversion -Waggregate-return -Wnested-externs -Wcast-align -Wwrite-strings
CFLAGS = -g ${WARN}
LIBS = sdl-config --libs
all:
gcc-3.0 ${WARN} blah.c ${LIBS}
and proof of concept code, “blah.c”:
#include <SDL/SDL.h>
#include <stdlib.h>
SDL_Surface *init_Video(void);
int main(void);
int main(void)
{
SDL_Surface *screen = init_Video();
Uint32 white = SDL_MapRGB(screen->format, 255, 255, 255);
return 0;
}
SDL_Surface *init_Video(void)
{
Uint32 flags = SDL_SWSURFACE;
Uint32 bpp = 32;
SDL_Surface *screen;
SDL_Init(SDL_INIT_VIDEO);
atexit(SDL_Quit);
bpp = SDL_VideoModeOK(640, 480, bpp, flags);
screen = SDL_SetVideoMode(640, 480, bpp, flags);
return screen;
}
and the error messages that both gcc-3.0 and gcc-2.95 give:
p at satan% make
gcc -Wall -W -Wstrict-prototypes -Wmissing-prototypes
-Wmissing-declarations -Wtraditional -Wshadow -Wpointer-arith
-Wcast-qual -Winline -Wredundant-decls -Wconversion -Waggregate-return
-Wnested-externs -Wcast-align -Wwrite-strings blah.c sdl-config --libs
blah.c: In function main': blah.c:10: warning: passing arg 2 ofSDL_MapRGB’ with different width due to prototype
blah.c:10: warning: passing arg 3 of SDL_MapRGB' with different width due to prototype blah.c:10: warning: passing arg 4 ofSDL_MapRGB’ with different width due to prototype
blah.c:10: warning: unused variable white' blah.c: In functioninit_Video’:
blah.c:23: warning: passing arg 3 of SDL_VideoModeOK' as signed due to prototype blah.c:24: warning: passing arg 3 ofSDL_SetVideoMode’ as signed due to prototype
do you get the same thing? i’m using sdl 1.2 (debian sarge, current).
pete