Re: [KOS] Problems compiling SDL 2 samples

[Harley L. <los...@gm...>]

$ make
rm -f example.elf
kos-cc -o example.elf testdraw2.o -lSDL2
testdraw2.o: In function `DrawPoints':
/usr/local/dc/kos-ports/SDL2-test/build/SDL2-2.0.4/test/testdraw2.c:79: 
undefined reference to `_SDL_RenderGetViewport'
...
/usr/local/dc/kos-ports/SDL2-test/build/SDL2-2.0.4/test/testdraw2.c:299: 
undefined reference to `_SDL_atoi'
collect2: error: ld returned 1 exit status
Makefile:28: recipe for target 'example.elf' failed
make: *** [example.elf] Error
$ sh-elf-nm $KOS_PORTS/lib/libSDL2.a | grep -E "(RenderGetViewport|atoi)"
          U _SDL_atoi_REAL
          U _SDL_atoi_REAL
          U _SDL_atoi_REAL
          U _SDL_atoi_REAL
          U _SDL_atoi_REAL
00000000 T _SDL_RenderGetViewport_REAL
          U _atoi
00000000 T _SDL_atoi_REAL
          U _SDL_atoi_REAL

$ grep -Er "(RenderGetViewport_REAL|SDL_atoi_REAL)"
src/dynapi/SDL_dynapi_overrides.h:#define SDL_RenderGetViewport 
SDL_RenderGetViewport_REAL
src/dynapi/SDL_dynapi_overrides.h:#define SDL_atoi SDL_atoi_REAL


 From what I can tell, SDL2 wants SDL_dynapi defined for all platforms.

On 02/10/2016 08:13 AM, Luke Benstead wrote:
> Thanks OK, I just wanted to make sure that what I was doing in the 
> makefile wasn't obviously wrong... I'll keep digging! Thanks!
>
> On 10 February 2016 at 15:34, Lawrence Sebald <blu...@gm... 
> <mailto:blu...@gm...>> wrote:
>
>     Unfortunately, I have no idea why you’d be having that particular
>     issue off the top of my head. It looks like you’re compiling in
>     the SDL_render.c file into your library, which is where those
>     functions are implemented, so I don’t really know…
>
>     The only thing I can guess is that somehow you’re picking up an
>     old version of the library where you didn’t compile that in or
>     something? Try rebuilding the entire library and then the program
>     again?
>
>     I really know next to nothing about SDL2, which I suppose doesn’t
>     help here...
>
>>     On Feb 10, 2016, at 4:03 AM, Luke Benstead <ka...@gm...
>>     <mailto:ka...@gm...>> wrote:
>>
>>     Hi there!
>>
>>     I've managed to get the SDL 2 port to a state where it compiles,
>>     but is untested. My SD card adapter just arrived so I figured I'd
>>     try to compile one of the SDL 2 sample applications to test the port.
>>
>>     I added the following target to the KOSMakefile.mk file:
>>
>>
>>     defaultall: replacefiles $(OBJS) subdirs linklib buildsamples
>>
>>     TESTDRAW2_SRCS = $(CURDIR)/test/testdraw2.c
>>     TESTDRAW2_OBJS = $(CURDIR)/test/testdraw2.o
>>     TESTDRAW2_TARGET = testdraw2.elf
>>
>>     buildsamples:
>>         $(KOS_CC) $(CFLAGS) -Iinclude -c $(TESTDRAW2_SRCS) -o
>>     $(TESTDRAW2_OBJS)
>>         $(KOS_CC) $(KOS_CFLAGS) $(KOS_LDFLAGS) -L$(CURDIR) -Iinclude
>>     -o $(TESTDRAW2_TARGET) $(KOS_START) $(TESTDRAW2_OBJS) $(KOS_LIBS)
>>     -lSDL2
>>
>>     No matter what incantation I use to build the source file, I
>>     still end up with undefined references to the SDL 2 functions. e.g.
>>
>>     /home/lukeb/Dreamcast/kos-ports/SDL2/build/SDL2-2.0.4/test/testdraw2.o:
>>     In function `_DrawPoints':
>>     testdraw2.c:(.text+0x1a0): undefined reference to
>>     `_SDL_RenderGetViewport'
>>     testdraw2.c:(.text+0x1b8): undefined reference to
>>     `_SDL_SetRenderDrawColor'
>>     testdraw2.c:(.text+0x1c4): undefined reference to
>>     `_SDL_RenderDrawPoint'
>>
>>
>>     Am I missing something obvious? Grepping for those functions does
>>     find them in libSDL2.a which I'm linking to. I've tried changing
>>     the order of the GCC args, and also tried just compiling the
>>     source file directly rather than to an object file first.
>>
>>     I'd appreciate any suggestions you might have!
>>
>>     Thanks,
>>
>>     Luke.
>>
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