gcc cant find SDL.h, but its there!

unholy · 01-11-2004, 09:03 AM

No luck I'm afraid, heres the output.

Code:

[unholy@localhost example1]$ gcc example1.c -o example -lSDL -lpthread
example1.c:10:17: SDL.h: No such file or directory
example1.c:13: error: syntax error before '*' token
example1.c: In function `setpixel':
example1.c:15: error: `Uint8' undeclared (first use in this function)
example1.c:15: error: (Each undeclared identifier is reported only once
example1.c:15: error: for each function it appears in.)
example1.c:15: error: `ubuff8' undeclared (first use in this function)
example1.c:16: error: `Uint16' undeclared (first use in this function)
example1.c:16: error: `ubuff16' undeclared (first use in this function)
example1.c:17: error: `Uint32' undeclared (first use in this function)
example1.c:17: error: `ubuff32' undeclared (first use in this function)
example1.c:18: error: syntax error before "color"
example1.c:22: error: `screen' undeclared (first use in this function)
example1.c:28: error: `color' undeclared (first use in this function)
example1.c:28: error: `r' undeclared (first use in this function)
example1.c:28: error: `g' undeclared (first use in this function)
example1.c:28: error: `b' undeclared (first use in this function)
example1.c:34: error: syntax error before ')' token
example1.c:35: error: `y' undeclared (first use in this function)
example1.c:35: error: `x' undeclared (first use in this function)
example1.c:36: error: syntax error before "color"
example1.c:40: error: syntax error before ')' token
example1.c:42: error: syntax error before ')' token
example1.c:43: error: syntax error before "color"
example1.c:47: error: syntax error before ')' token
example1.c:51: error: `SDL_BYTEORDER' undeclared (first use in this function)
example1.c:51: error: `SDL_LIL_ENDIAN' undeclared (first use in this function)
example1.c:67: error: syntax error before ')' token
example1.c:69: error: syntax error before ')' token
example1.c: At top level:
example1.c:84: error: syntax error before '*' token
example1.c: In function `DrawPicture':
example1.c:90: error: `screen' undeclared (first use in this function)
example1.c: In function `main':
example1.c:103: error: `SDL_Surface' undeclared (first use in this function)
example1.c:103: error: `screen' undeclared (first use in this function)
example1.c:104: error: `SDL_Event' undeclared (first use in this function)
example1.c:104: error: syntax error before "event"
example1.c:110: error: `SDL_INIT_VIDEO' undeclared (first use in this function)
example1.c:117: error: `SDL_Quit' undeclared (first use in this function)
example1.c:120: error: `SDL_SWSURFACE' undeclared (first use in this function)
example1.c:120: error: `SDL_ANYFORMAT' undeclared (first use in this function)
example1.c:136: error: `event' undeclared (first use in this function)
example1.c:139: error: `SDL_QUIT' undeclared (first use in this function)
example1.c:143: error: `SDL_KEYDOWN' undeclared (first use in this function)

unholy · 01-11-2004, 09:05 AM

And the paths seem okay.

Code:

[unholy@localhost example1]$ locate libSDL.a
/usr/lib/libSDL.a

Pres · 01-11-2004, 09:41 AM

all of that is to do with the header.

Try

#include <SDL/SDL.h> instead of "SDL.h" .... and do it again.

you're just doing an example here the thing is to get things going, not to worry about makefiles.

unholy · 01-11-2004, 09:58 AM

Doing that gives me this output

Code:

[unholy@localhost example1]$ gcc -g -Wall `sdl-config --cflags` `sdl-config --libs` -o example1 example1.c
example1.c: In function `DrawPicture':
example1.c:86: warning: unused variable `r'
example1.c:86: warning: unused variable `g'
example1.c:86: warning: unused variable `b'
example1.c: In function `main':
example1.c:128: warning: unsigned int format, pointer arg (arg 2)
/home/unholy/tmp/ccCOzzDc.o(.text+0x38): In function `setpixel':
/home/unholy/programming/example1/example1.c:23: undefined reference to `SDL_LockSurface'
/home/unholy/tmp/ccCOzzDc.o(.text+0x6a):/home/unholy/programming/example1/example1.c:28: undefined reference to `SDL_MapRGB'
/home/unholy/tmp/ccCOzzDc.o(.text+0x1f6):/home/unholy/programming/example1/example1.c:79: undefined reference to `SDL_UnlockSurface'
/home/unholy/tmp/ccCOzzDc.o(.text+0x27f): In function `DrawPicture':
/home/unholy/programming/example1/example1.c:96: undefined reference to `SDL_Flip'
/home/unholy/tmp/ccCOzzDc.o(.text+0x2a5): In function `main':
/home/unholy/programming/example1/example1.c:110: undefined reference to `SDL_Init'
/home/unholy/tmp/ccCOzzDc.o(.text+0x2b7):/home/unholy/programming/example1/example1.c:111: undefined reference to `SDL_GetError'
/home/unholy/tmp/ccCOzzDc.o(.text+0x2e2):/home/unholy/programming/example1/example1.c:117: undefined reference to `SDL_Quit'
/home/unholy/tmp/ccCOzzDc.o(.text+0x300):/home/unholy/programming/example1/example1.c:120: undefined reference to `SDL_SetVideoMode'
/home/unholy/tmp/ccCOzzDc.o(.text+0x317):/home/unholy/programming/example1/example1.c:122: undefined reference to `SDL_GetError'
/home/unholy/tmp/ccCOzzDc.o(.text+0x3ba):/home/unholy/programming/example1/example1.c:136: undefined reference to `SDL_PollEvent'
collect2: ld returned 1 exit status

Pres · 01-11-2004, 06:38 PM

Err well it's a dead givaway there that you did this :

[unholy@localhost example1]$ gcc -g -Wall `sdl-config --cflags` `sdl-config --libs` -o example1 example1.c

rather than this :

gcc example1.c -o example1 -lSDL -lpthread

with the <SDL/SDL.h> style include ... which was my suggestion

unholy · 01-11-2004, 07:23 PM

I do have <SDL/SDL.h> in my code.

Doing this

gcc example1.c -o example1 -lSDL -lpthread

gives me

Code:

[unholy@localhost example1]$ gcc example1.c -o example1 -lSDL -lpthread
/usr//bin/../lib/gcc-lib/i586-mandrake-linux-gnu/3.3.1/../../../libSDL.a(SDL_x11video.lo)(.text+0x1d): In function `X11_Available':
: undefined reference to `XOpenDisplay'
/usr//bin/../lib/gcc-lib/i586-mandrake-linux-gnu/3.3.1/../../../libSDL.a(SDL_x11video.lo)(.text+0x2f): In function `X11_Available':
: undefined reference to `XCloseDisplay'
/usr//bin/../lib/gcc-lib/i586-mandrake-linux-gnu/3.3.1/../../../libSDL.a(SDL_x11video.lo)(.text+0x453): In function `create_aux_windows':
: undefined reference to `XDestroyWindow'
/usr//bin/../lib/gcc-lib/i586-mandrake-linux-gnu/3.3.1/../../../libSDL.a(SDL_x11video.lo)(.text+0x4ff): In function `create_aux_windows':
: undefined reference to `XCreateWindow'
/usr//bin/../lib/gcc-lib/i586-mandrake-linux-gnu/3.3.1/../../../libSDL.a(SDL_x11video.lo)(.text+0x528): In function `create_aux_windows':
: undefined reference to `XSelectInput'


//lots more

Would you mind trying to compile the code I posted earlies to see if it compiles on your machine?

Hko · 01-12-2004, 10:49 AM

The errors you posted refer to libSDL.a. Seems the linker cannot find the dynamic libs (libSDL.so). Though I guess it should be very well posible to link SDL statically, it is not the way it should be done generally. this may be the problem when the X-lib's are installed dynamically only. How did you install SDL?

When I try to compile the program you posted, I get no errors (only warnings), either using the sdl-config stuff + #include "SDL.h", or using "gcc example1.c -o example1 -lSDL -lpthread" with #include <SDL/SDL.h>. (on Debian)

unholy · 01-12-2004, 01:13 PM

According to the SDL website, mandrake (and slackware) install KDE in non standard folders, so I added these lines to ld.so.conf, as suggested, but still to no avail

/usr/lib
/opt/kde/lib

I installed the libraries from rpms on a CD, which I think came with Linux Mandrake. I am starting to think it is a problem with the OS. Perhaps it is time to go back to SuSE.

libSDL.a resides in /usr/lib

libSDL.so does not turn up when i try to 'locate' it as a normal user. But as root 'locate' does find it.

I have tried therefore to compile as root but the results arent any different.

Perhaps mandrake is a less ideal distro for the developer.

kev82 · 01-12-2004, 01:26 PM

by unholy
I installed the libraries from rpms on a CD

<cut />

libSDL.a resides in /usr/lib

libSDL.so does not turn up when i try to 'locate' it as a normal user. But as root 'locate' does find it.

from what ive heard and from the questions ive answered before, mandrake is a bit of a nightmare for development purposes

you say you installed rpm's, were they the normal, development, or static-development rpms because the presence of libSDL.a but not libSDL.so make me think youve installed the static-development rather than the development rpm. but i could be wrong as i dont know much about mandrake/rpms

Hko · 01-12-2004, 03:48 PM

Could it be that the libSDL.so are not readable to normal users?

Pres · 01-12-2004, 03:50 PM

Yeah Kev82 is onto something perhaps - did you install the development package but not the runtimes ? I think you need both,

unholy · 01-12-2004, 05:55 PM

These are the contents of the folder I did the rpm -Uhv from

Code:

SDL-1.0.8-1.i386.rpm              SDL_mixer-1.2.5-1.i386.rpm
SDL-1.2.6-1.i386.rpm              SDL_mixer-devel-1.2.5-1.i386.rpm
SDL-devel-1.0.8-1.i386.rpm        SDL_net-1.2.5-1.i386.rpm
SDL-devel-1.2.6-1.i386.rpm        SDL_net-devel-1.2.5-1.i386.rpm
SDL_image-1.2.3-1.i386.rpm        SDL_ttf-2.0.6-1.i386.rpm
SDL_image-devel-1.2.3-1.i386.rpm  SDL_ttf-devel-2.0.6-1.i386.rpm

If libSDL.so wasnt readable to normal users, at least root should have been able to install it. I think maybe Mandrake is the problem. Its a pity. I've tried several distros, and found Mandrake struck the balance the best. But development is a must for me, so perhaps I will try another of the distros I have here on DVD (SuSE 82., Debian Woody Stable, Gentoo, Slackware, Fedora).

Incidentally, rpm -q SDL doesnt turn up anything.

tthtlc · 06-11-2010, 01:16 AM

Sorry for being late, but your code was quite useful for me, thanks for that, and it compiles successfully easily too....due to a few errors you have:

a. Use <SDL.h> instead. Some error output reduced.
b. It is a C++ program, so please use ".cpp" instead of ".c". "gcc" will use different binaries to execute the ".cpp" vs ".c". More errors reduced.
c. After I change "gcc" to "g++" all error got eliminated, so the working commandline is:

g++ `sdl-config --cflags` `sdl-config --libs` mysdl_example.cpp

(where mysdl_example.cpp is the code you posted earlier.)

My env is Ubuntu 9.04).

A good piece of reference code.

Thanks.

PS:

One of the error I got is:

undefined reference to `__gxx_personality_v0'

this was because I had used "gcc" to compile the "xxx.cpp" instead of "g++" - because I thought gcc is intelligent enough to use g++ just by the recognizing the extension is ".cpp". But no:

http://www.network-theory.co.uk/docs...cintro_54.html