error: no member named 'stdio' in 'union SDL_RWops:: while building

[derrandz]

Hello,

so I followed the specified steps to build SDL2_image, I did as README-emscripten.txt specified.
the command:

$: emconfigure ./configure --disable-sdltest --with-sdl-prefix=/mycustompath --prefix=/mycustompath

has succeeded, however when I run

$: emmake make

the following error promps out:

$: emmake make
/bin/sh ./libtool  --tag=CC   --mode=compile emcc -DPACKAGE_NAME=\"\" -DPACKAGE_TARNAME=\"\" -DPACKAGE_VERSION=\"\" -DPACKAGE_STRING=\"\" -DPACKAGE_BUGREPORT=\"\" -DPACKAGE_URL=\"\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DHAVE_DLFCN_H=1 -DLT_OBJDIR=\".libs/\" -DPACKAGE=\"SDL2_image\" -DVERSION=\"2.0.0\" -DLOAD_BMP=1 -DLOAD_GIF=1 -DLOAD_LBM=1 -DLOAD_PCX=1 -DLOAD_PNM=1 -DLOAD_TGA=1 -DLOAD_XCF=1 -DLOAD_XPM=1 -DLOAD_XV=1 -I.      -MT IMG.lo -MD -MP -MF .deps/IMG.Tpo -c -o IMG.lo IMG.c
libtool: compile:  emcc -DPACKAGE_NAME=\"\" -DPACKAGE_TARNAME=\"\" -DPACKAGE_VERSION=\"\" -DPACKAGE_STRING=\"\" -DPACKAGE_BUGREPORT=\"\" -DPACKAGE_URL=\"\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DHAVE_DLFCN_H=1 -DLT_OBJDIR=\".libs/\" -DPACKAGE=\"SDL2_image\" -DVERSION=\"2.0.0\" -DLOAD_BMP=1 -DLOAD_GIF=1 -DLOAD_LBM=1 -DLOAD_PCX=1 -DLOAD_PNM=1 -DLOAD_TGA=1 -DLOAD_XCF=1 -DLOAD_XPM=1 -DLOAD_XV=1 -I. -MT IMG.lo -MD -MP -MF .deps/IMG.Tpo -c IMG.c  -fPIC -DPIC -o .libs/IMG.o
IMG.c:184:23: error: use of undeclared identifier 'SDL_RWOPS_STDFILE'
    if ( src->type == SDL_RWOPS_STDFILE ) {
                      ^
IMG.c:189:74: error: no member named 'stdio' in 'union SDL_RWops::(anonymous at
      /home/hrt/Schoolspace/Capstone/Libraries/emsdk_portable/emscripten/master/system/include/SDL/SDL_rwops.h:83:5)'
        data = emscripten_get_preloaded_image_data_from_FILE(src->hidden.stdio.fp, &w, &h);
                                                             ~~~~~~~~~~~ ^
2 errors generated.
ERROR:root:compiler frontend failed to generate LLVM bitcode, halting
make: *** [IMG.lo] Error 1

I appreciate the help.

[gsathya]

cc @Daft-Freak @juj

[Daft-Freak]

It looks like the build is finding the SDL 1.3 headers (SDL_RWOPS_STDFILE is defined in the SDL2 version of SDL_rwops.h but not the SDL1.3 version).

Also, looks that README file needs some updating...

[derrandz]

How do I specify the version of SDL for the build?

[gsathya]

IIRC "-s USE_SDL=2"

[derrandz]

How do I use -s USE_SDL=2 when the project is built by make..

I mean, in the docs, the use of such option is supplied to the compiler call emcc..

Do I have to manually modify the Makefile?

[Daft-Freak]

If there's an installed SDL2 build at --with-sdl-prefix it should just work. The recommended way of using SDL2 is to use Emscripten ports (-s USE_SDL=2 and -s USE_SDL_IMAGE=2). Building it yourself should still work though.

[derrandz]

The building of SDL2 went like charm actually, I am struggling to get SDL2_Image to build..

I do supply the built version of SDL2 to the emconfigure of SDL_image2, yet that problem occurs.

[Daft-Freak]

Did you emmake make install SDL2?

[derrandz]

Yes, I did.

However, one thing I noticed when I was ran emconfigure for SDL2_image

-config: No such file or directory
./configure: line 12524: /.../Libraries/SDL-emscripten/bin/sdl2-config: No such file or directory
./configure: line 12527: /.../Libraries/SDL-emscripten/bin/sdl2-config: No such file or directory
./configure: line 12529: /.../Libraries/SDL-emscripten/bin/sdl2-config: No such file or directory
./configure: line 12531: /.../Libraries/SDL-emscripten/bin/sdl2-config: No such file or directory

And I noticed that there is no bin directory in SDL-emscripten.

[Daft-Freak]

Make sure --with-sdl-prefix points to the prefix SDL was installed to not the source dir, the bin folder only exists after install.

[derrandz]

And where is that?

[Daft-Freak]

The path passed as --prefix to SDL2 configure.

[derrandz]

Since it was not specified in README-emscripten.txt, I haven't specified it explicitly and I think it was put in /usr/local

To avoid ambiguity I have re-ran emconfigure with a --prefix and supplied it to SDL2_image configure, now everything works.

I apologize for the inconvenience,
thank you.

[Daft-Freak]

Ah, didn't notice that the SDL2 docs don't mention specifying a prefix. I don't think the instructions for building SDL2_image have been updated since the initial port. I'll go and update that now.