AC_PREREQ([2.50])
AC_INIT([leptonica], [1.73])
AC_CONFIG_AUX_DIR([config])
AC_CONFIG_HEADERS([config_auto.h:config/config.h.in])
AC_CONFIG_SRCDIR([src/adaptmap.c])

AC_CONFIG_MACRO_DIR([m4])
LT_INIT

AM_INIT_AUTOMAKE
AC_LANG(C)
AC_CANONICAL_HOST

# Checks for programs.
AC_PROG_AWK
AC_PROG_CC
AC_PROG_CPP
AC_PROG_INSTALL
AC_PROG_LIBTOOL
AC_PROG_LN_S
AC_PROG_MAKE_SET

# Checks for arguments.
AC_ARG_WITH([zlib], AS_HELP_STRING([--without-zlib], [do not include zlib support]))
AC_ARG_WITH([libpng], AS_HELP_STRING([--without-libpng], [do not include libpng support]))
AC_ARG_WITH([jpeg], AS_HELP_STRING([--without-jpeg], [do not include jpeg support]))
AC_ARG_WITH([giflib], AS_HELP_STRING([--without-giflib], [do not include giflib support]))
AC_ARG_WITH([libtiff], AS_HELP_STRING([--without-libtiff], [do not include libtiff support]))
AC_ARG_WITH([libwebp], AS_HELP_STRING([--without-libwebp], [do not include libwebp support]))
AC_ARG_WITH([libopenjpeg], AS_HELP_STRING([--without-libopenjpeg], [do not include libopenjpeg support]))

AC_ARG_ENABLE([programs], AS_HELP_STRING([--disable-programs], [do not build additional programs]))
AM_CONDITIONAL([ENABLE_PROGRAMS], [test "x$enable_programs" != xno])

# Checks for libraries.
LT_LIB_M

AS_IF([test "x$with_zlib" != xno],
  AC_CHECK_LIB([z], [deflate],
    AC_DEFINE([HAVE_LIBZ], 1, [Define to 1 if you have zlib.]) AC_SUBST([ZLIB_LIBS], [-lz]),
    AS_IF([test "x$with_zlib" = xyes], AC_MSG_ERROR([zlib support requested but library not found]))
  )
)

AS_IF([test "x$with_libpng" != xno],
  AC_CHECK_LIB([png], [png_read_png],
    AC_DEFINE([HAVE_LIBPNG], 1, [Define to 1 if you have libpng.]) AC_SUBST([LIBPNG_LIBS], [-lpng]),
    AS_IF([test "x$with_libpng" = xyes], AC_MSG_ERROR([libpng support requested but library not found])),
    ${LIBM} ${ZLIB_LIBS}
  )
)

AS_IF([test "x$with_jpeg" != xno],
  AC_CHECK_LIB([jpeg], [jpeg_read_scanlines],
    AC_DEFINE([HAVE_LIBJPEG], 1, [Define to 1 if you have jpeg.]) AC_SUBST([JPEG_LIBS], [-ljpeg]),
    AS_IF([test "x$with_jpeg" = xyes], AC_MSG_ERROR([jpeg support requested but library not found]))
  )
)

AS_IF([test "x$with_giflib" != xno],
  AC_CHECK_LIB([gif], [DGifOpenFileHandle],
    AC_DEFINE([HAVE_LIBGIF], 1, [Define to 1 if you have giflib.]) AC_SUBST([GIFLIB_LIBS], [-lgif]),
    AS_IF([test "x$with_giflib" = xyes], AC_MSG_ERROR([giflib support requested but library not found]))
  )
)

AM_CONDITIONAL([HAVE_LIBGIF], [test "x$ac_cv_lib_gif_DGifOpenFileHandle" = xyes])

AS_IF([test "x$with_libtiff" != xno],
  AC_CHECK_LIB([tiff], [TIFFOpen],
    AC_DEFINE([HAVE_LIBTIFF], 1, [Define to 1 if you have libtiff.]) AC_SUBST([LIBTIFF_LIBS], [-ltiff]),
    AS_IF([test "x$with_libtiff" = xyes], AC_MSG_ERROR([libtiff support requested but library not found])),
    ${LIBM} ${ZLIB_LIBS} ${JPEG_LIBS}
  )
)

AS_IF([test "x$with_libwebp" != xno],
  AC_CHECK_LIB([webp], [WebPGetInfo],
    AC_DEFINE([HAVE_LIBWEBP], 1, [Define to 1 if you have libwebp.]) AC_SUBST([LIBWEBP_LIBS], [-lwebp]),
    AS_IF([test "x$with_libwebp" = xyes], AC_MSG_ERROR([libwebp support requested but library not found])),
    ${LIBM}
  )
)

AM_CONDITIONAL([HAVE_LIBWEBP], [test "x$ac_cv_lib_webp_WebPGetInfo" = xyes])

AS_IF([test "x$with_libopenjpeg" != xno],
  AC_CHECK_LIB([openjp2], [opj_create_decompress],
    [
      AC_DEFINE([HAVE_LIBJP2K], 1, [Define to 1 if you have libopenjp2.]) AC_SUBST([LIBJP2K_LIBS], [-lopenjp2])
      [AC_CHECK_HEADERS([openjpeg-2.2/openjpeg.h openjpeg-2.1/openjpeg.h openjpeg-2.0/openjpeg.h],
       AC_DEFINE_UNQUOTED([LIBJP2K_HEADER], [<$ac_header>], [Path to <openjpeg.h> header file.]) break)]
    ],
    AS_IF([test "x$with_libopenjpeg" = xyes], AC_MSG_ERROR([libopenjp2 support requested but library not found]))
  )
)

AM_CONDITIONAL([HAVE_LIBJP2K], [test "x$ac_cv_lib_openjp2_opj_create_decompress" = xyes])

case "$host_os" in
  mingw32*)
  AC_SUBST([GDI_LIBS], [-lgdi32])
  CPPFLAGS="${CPPFLAGS} -D__USE_MINGW_ANSI_STDIO" ;;
esac

# Enable less verbose output when building.
m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])

# Checks for typedefs, structures, and compiler characteristics.
AC_TYPE_SIZE_T
AC_C_BIGENDIAN

AC_SUBST([APPLE_UNIVERSAL_BUILD], [0])
AC_SUBST([ENDIANNESS], [L_LITTLE_ENDIAN])

case "$ac_cv_c_bigendian" in
  yes) AC_SUBST([ENDIANNESS], [L_BIG_ENDIAN]) ;;
  universal) AC_SUBST([APPLE_UNIVERSAL_BUILD], [1]) ;;
esac

# Add the -Wl and --as-needed flags to gcc compiler
AC_MSG_CHECKING([whether compiler supports -Wl,--as-needed])
OLD_LDFLAGS="${LDFLAGS}"
LDFLAGS="-Wl,--as-needed ${LDFLAGS}"

AC_LINK_IFELSE([AC_LANG_PROGRAM()],
  AC_MSG_RESULT([yes]),
  LDFLAGS="${OLD_LDFLAGS}"; AC_MSG_RESULT([no])
)

# Checks for library functions.
AC_CHECK_FUNCS([fmemopen])

AC_CONFIG_FILES([Makefile src/endianness.h src/Makefile lept.pc])
AC_OUTPUT