Automatic detection of locally built SDL components is wonky on Fedora about systemshock HOT 8 CLOSED

PR #84 should make the detection of SDL_mixer a bit more automatic when it comes to the local builds. Could you give that a shot?

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@StrayLightning I updated PR#84 to be better about finding the locally built SDL2 over the system built one, want to give it a shot?

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I'm on Fedora 27, and System Shock builds just fine with the includes from the system SDL2-devel.i686 and SDL2_mixer-devel.i686 packages.
I do need a locally-built version of SDL2_mixer (the official 2.0.2 release segfaults when trying to play a VOC file), but for that I just copied libSDL2_mixer-2.0.so.0 into the local directory and run with LD_LIBRARY_PATH=. ./systemshock so the dynamic linker picks it up before the system version.

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I tried PR#84 with:

git fetch https://github.com/Interrupt/systemshock.git pull/84/head:pr84
git checkout pr84

CMake reported better than before, but it's still picking up the system SDL includes, and it looks like it would try to pick up the 64-bit library from the system:

-- Found SDL2_MIXER: /home/[...]/systemshock-interrupt/build_ext/built_sdl_mixer/lib/libSDL2_mixer.so
-- Found SDL2 Include:/usr/include/SDL2 Library:-L/usr/lib64 -lSDL2
-- Found SDL2_Mixer Include:/home/[...]/systemshock-interrupt/build_ext/built_sdl_mixer/include/SDL2 Library:/home/[...]/systemshock-interrupt/build_ext/built_sdl_mixer/lib/libSDL2_mixer.so

The build then fails because I don't have SDL2-devel.i686 installed:

/usr/include/SDL2/SDL_config.h:42:10: fatal error: SDL_config-i386.h: No such file or directory
#include "SDL_config-i386.h"

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Use cmake -DSDL2_DIR=/usr/lib32/cmake/SDL2 <path to sources>.

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Thanks @winterheart. I have edited my original Issue text to be explicit that I could build by specifying the local SDL2 locations.

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@Interrupt -- That worked great:

$ cmake .
[...]
-- Found SDL2 Include:/home/[...]/systemshock-interrupt/build_ext/built_sdl/include/SDL2 Library:-L/home/[...]/systemshock-interrupt/build_ext/built_sdl/lib **-Wl,-rpath,/home/[...]/systemshock-interrupt/build_ext/built_sdl/lib** -Wl,--enable-new-dtags -lSDL2
-- Found SDL2_Mixer Include:/home/[...]/systemshock-interrupt/build_ext/built_sdl_mixer/include/SDL2 Library:/home/[...]/systemshock-interrupt/build_ext/built_sdl_mixer/lib/libSDL2_mixer.so
[...]

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I think this is fixed now, closing.

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