lol/build/autotools/m4/lol-sdl.m4

dnl
dnl  Lol Engine
dnl
dnl  Copyright © 2010—2017 Sam Hocevar <sam@hocevar.net>
dnl
dnl  Lol Engine is free software. It comes without any warranty, to
dnl  the extent permitted by applicable law. You can redistribute it
dnl  and/or modify it under the terms of the Do What the Fuck You Want
dnl  to Public License, Version 2, as published by the WTFPL Task Force.
dnl  See http://www.wtfpl.net/ for more details.
dnl


# LOL_AC_CHECK_SDL()
# ------------------
AC_DEFUN([LOL_AC_CHECK_SDL],
[
ac_cv_my_have_sdl="no"
ac_cv_my_have_sdl_image="no"
ac_cv_my_have_sdl_mixer="no"
if test "${enable_sdl}" != "no"; then
  LOL_AC_CHECK_SDL_INNER()
fi
AM_CONDITIONAL(LOL_USE_SDL, test "${ac_cv_my_have_sdl}" != "no")
AM_CONDITIONAL(LOL_USE_SDL_MIXER, test "${ac_cv_my_have_sdl_mixer}" != "no")
AM_CONDITIONAL(LOL_USE_SDL_IMAGE, test "${ac_cv_my_have_sdl_image}" != "no")
])

# LOL_AC_CHECK_SDL_INNER()
# ------------------------
AC_DEFUN([LOL_AC_CHECK_SDL_INNER],
[
dnl  Find which version of SDL to use (always required on Linux or Win32)
dnl
dnl  Defined C/C++ macros:
dnl    LOL_USE_SDL         -- whether SDL v2 was found
dnl    LOL_USE_SDL_IMAGE   -- whether SDL_image was found
dnl    LOL_USE_SDL_MIXER   -- whether SDL_mixer was found
dnl    HAVE_SDL_H      -- whether to include <SDL.h>
dnl    HAVE_SDL2_SDL_H -- whether to include <SDL2/SDL.h>
dnl  Generated automake conditionals:
dnl    LOL_USE_SDL         -- whether SDL v2 was found
dnl    LOL_USE_SDL_IMAGE   -- whether SDL_image was found
dnl    LOL_USE_SDL_MIXER   -- whether SDL_mixer was found
dnl  Generated shell variables:
dnl    SDL_CFLAGS      -- flags for SDL compilation
dnl    SDL_LIBS        -- flags for SDL linking


dnl  First, try the proper pkg-config check for SDL2

if test "x${ac_cv_my_have_sdl}" = xno; then
  PKG_CHECK_MODULES(SDL2, sdl2,
   [ac_cv_my_have_sdl="yes"
    PKG_CHECK_MODULES(SDL2MIXER, SDL2_mixer,
     [ac_cv_my_have_sdl_mixer="yes"
      AC_DEFINE(HAVE_SDL_MIXER_H, 1, Define to 1 to use SDL_mixer.h)],
     [:])
    PKG_CHECK_MODULES(SDL2IMAGE, SDL2_image,
     [ac_cv_my_have_sdl_image="yes"
      AC_DEFINE(HAVE_SDL_IMAGE_H, 1, Define to 1 to use SDL_image.h)],
     [:])
    SDL_CFLAGS="${SDL2_CFLAGS} ${SDL2MIXER_CFLAGS} ${SDL2IMAGE_CFLAGS}"
    SDL_LIBS="${SDL2_LIBS} ${SDL2MIXER_LIBS} ${SDL2IMAGE_LIBS}"
    AC_DEFINE(HAVE_SDL_H, 1, Define to 1 to use SDL.h)],
   [:])
fi


dnl  Maybe all this has failed, try direct inclusion instead

if test "x${ac_cv_my_have_sdl}" = xno; then
  save_CPPFLAGS="${CPPFLAGS}"
  save_LIBS="${LIBS}"
  CPPFLAGS="${CPPFLAGS} ${SDL_CFLAGS}"
  LIBS="${LIBS} ${SDL_LIBS}"
  AC_CHECK_HEADERS(SDL.h SDL2/SDL.h,
   [ac_cv_my_have_sdl="yes"])
  if test "x${ac_cv_my_have_sdl}" != xno; then
    AC_CHECK_HEADERS(SDL_mixer.h SDL2/SDL_mixer.h,
     [ac_cv_my_have_sdl_mixer="yes"])
    AC_CHECK_HEADERS(SDL_image.h SDL2/SDL_image.h,
     [ac_cv_my_have_sdl_image="yes"])
    AC_CHECK_LIB(SDL2, main,
     [SDL_LIBS="${SDL_LIBS} -lSDL2"],
     [ac_cv_my_have_sdl="no"])
    AC_CHECK_LIB(SDL2main, main,
     [SDL_LIBS="${SDL_LIBS} -lSDL2main -lSDL2"])
    AC_CHECK_LIB(SDL2_mixer, main,
     [SDLMIXER_LIBS="${SDLMIXER_LIBS} -lSDL2_mixer"],
     [ac_cv_my_have_sdl_mixer="no"])
    AC_CHECK_LIB(SDL2_image, main,
     [SDLIMAGE_LIBS="${SDLIMAGE_LIBS} -lSDL2_image"],
     [ac_cv_my_have_sdl_image="no"])
    SDL_CFLAGS="${SDL_CFLAGS} ${SDLMIXER_CFLAGS} ${SDLIMAGE_CFLAGS}"
    SDL_LIBS="${SDL_LIBS} ${SDLMIXER_LIBS} ${SDLIMAGE_LIBS}"
  fi
  CPPFLAGS="${save_CPPFLAGS}"
  LIBS="${save_LIBS}"
fi


dnl  Convert all this into conditionals

if test "x${ac_cv_my_have_sdl}" = xno; then
  AC_MSG_WARN([SDL v2 not found])
else
  AC_DEFINE(LOL_USE_SDL, 1, Define to 1 to use SDL)
fi

if test "x${ac_cv_my_have_sdl_mixer}" = xno; then
  AC_MSG_WARN([SDL_mixer not found])
else
  AC_DEFINE(LOL_USE_SDL_MIXER, 1, Define to 1 to use SDL_mixer)
fi

if test "x${ac_cv_my_have_sdl_image}" = xno; then
  AC_MSG_WARN([SDL_image not found])
else
  AC_DEFINE(LOL_USE_SDL_IMAGE, 1, Define to 1 to use SDL_image)
fi

]) # LOL_AC_CHECK_SDL_INNER