configure.ac - third_party/github.com/intel/libva - Git at Google

 # Copyright (c) 2007 Intel Corporation. All Rights Reserved.
 #
 # Permission is hereby granted, free of charge, to any person obtaining a
 # copy of this software and associated documentation files (the
 # "Software"), to deal in the Software without restriction, including
 # without limitation the rights to use, copy, modify, merge, publish,
 # distribute, sub license, and/or sell copies of the Software, and to
 # permit persons to whom the Software is furnished to do so, subject to
 # the following conditions:
 #
 # The above copyright notice and this permission notice (including the
 # next paragraph) shall be included in all copies or substantial portions
 # of the Software.
 #
 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
 # IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR
 # ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 # TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 # SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

 # VA-API version
 # - increment major for any ABI change
 # - increment minor for any interface change (e.g. new/modified function)
 # - increment micro for any other change (new flag, new codec definition, etc.)
 # - reset micro version to zero when minor version is incremented
 # - reset minor version to zero when major version is incremented
 m4_define([va_api_major_version], [1])
 m4_define([va_api_minor_version], [12])
 m4_define([va_api_micro_version], [0])

 m4_define([va_api_version],
           [va_api_major_version.va_api_minor_version.va_api_micro_version])

 # libva package version number, (as distinct from shared library version)
 # XXX: we want the package version to remain at 1.0.x for VA-API 0.32.y
 #
 # - major version is automatically generated from VA-API major version
 # - minor version is automatically generated from VA-API minor version
 # - increment micro for any library release
 # - reset micro version to zero when VA-API major or minor version is changed
 m4_define([libva_major_version], [m4_eval(va_api_major_version + 1)])
 m4_define([libva_minor_version], [m4_eval(va_api_minor_version)])
 m4_define([libva_micro_version], [0])
 m4_define([libva_pre_version],   [0])

 m4_define([libva_version],
           [libva_major_version.libva_minor_version.libva_micro_version])
 m4_if(libva_pre_version, [0], [], [
 m4_append([libva_version], libva_pre_version, [.pre])
 ])

 # libva library version number (generated, do not change)
 # XXX: we want the SONAME to remain at libva.so.1 for VA-API major == 0
 #
 # The library name is generated libva.<x>.<y>.0 where
 # <x> = VA-API major version + 1
 # <y> = 100 * VA-API minor version + VA-API micro version
 #
 # For example:
 # VA-API 0.32.0 generates libva.so.1.3200.0
 # VA-API 0.34.1 generates libva.so.1.3401.0
 # VA-API 1.2.13 generates libva.so.2.213.0
 m4_define([libva_interface_bias], [m4_eval(va_api_major_version + 1)])
 m4_define([libva_interface_age],  [0])
 m4_define([libva_binary_age],
           [m4_eval(100 * va_api_minor_version + va_api_micro_version - libva_interface_age)])

 m4_define([libva_lt_current],
           [m4_eval(100 * va_api_minor_version + va_api_micro_version + libva_interface_bias)])
 m4_define([libva_lt_revision],
           [m4_eval(libva_interface_age)])
 m4_define([libva_lt_age],
           [m4_eval(libva_binary_age - libva_interface_age)])

 # libdrm minimun version requirement
 m4_define([libdrm_version], [2.4.60])

 # Wayland minimum version number
 # 1.11.0 for wl_proxy_create_wrapper
 m4_define([wayland_api_version], [1.11.0])

 AC_PREREQ(2.57)
 AC_INIT([libva],
         [libva_version],
         [https://github.com/intel/libva/issues/new],
         [libva],
         [https://github.com/intel/libva])

 AC_CONFIG_SRCDIR([Makefile.am])
 AC_CONFIG_MACRO_DIR([m4])
 AM_INIT_AUTOMAKE([dist-bzip2 -Wno-portability])

 AC_CONFIG_HEADERS([config.h])
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])

 TODAY="`LC_ALL=C date +'%a, %d %b %Y %X %z'`"
 AC_SUBST(TODAY)

 VA_API_MAJOR_VERSION=va_api_major_version
 VA_API_MINOR_VERSION=va_api_minor_version
 VA_API_MICRO_VERSION=va_api_micro_version
 VA_API_VERSION=va_api_version
 AC_SUBST(VA_API_MAJOR_VERSION)
 AC_SUBST(VA_API_MINOR_VERSION)
 AC_SUBST(VA_API_MICRO_VERSION)
 AC_SUBST(VA_API_VERSION)

 LIBVA_MAJOR_VERSION=libva_major_version
 LIBVA_MINOR_VERSION=libva_minor_version
 LIBVA_MICRO_VERSION=libva_micro_version
 LIBVA_VERSION=libva_version
 AC_SUBST(LIBVA_MAJOR_VERSION)
 AC_SUBST(LIBVA_MINOR_VERSION)
 AC_SUBST(LIBVA_MICRO_VERSION)
 AC_SUBST(LIBVA_VERSION)

 LIBVA_LT_CURRENT=libva_lt_current
 LIBVA_LT_REV=libva_lt_revision
 LIBVA_LT_AGE=libva_lt_age
 LIBVA_LT_VERSION="$LIBVA_LT_CURRENT:$LIBVA_LT_REV:$LIBVA_LT_AGE"
 LIBVA_LT_LDFLAGS="-version-info $LIBVA_LT_VERSION"
 AC_SUBST(LIBVA_LT_VERSION)
 AC_SUBST(LIBVA_LT_LDFLAGS)

 AC_ARG_ENABLE(docs,
     [AC_HELP_STRING([--enable-docs],
                     [build Doxygen documentation @<:@default=no@:>@])],
     [], [enable_docs="no"])

 AC_ARG_ENABLE(drm,
     [AC_HELP_STRING([--enable-drm],
                     [build with VA/DRM API support @<:@default=yes@:>@])],
     [], [enable_drm="yes"])

 AC_ARG_ENABLE(x11,
     [AC_HELP_STRING([--enable-x11],
                     [build with VA/X11 API support @<:@default=auto@:>@])],
     [], [enable_x11="auto"])

 AC_ARG_ENABLE(glx,
     [AC_HELP_STRING([--enable-glx],
                     [build with VA/GLX API support @<:@default=auto@:>@])],
     [], [enable_glx="auto"])

 AC_ARG_ENABLE([wayland],
     [AC_HELP_STRING([--enable-wayland],
                     [build with VA/Wayland API support @<:@default=auto@:>@])],
     [], [enable_wayland="auto"])

 AC_ARG_ENABLE([va-messaging],
     [AC_HELP_STRING([--enable-va-messaging],
                     [build with va info and error messaging @<:@default=yes@:>@])],
     [], [enable_va_messaging="yes"])

 AC_ARG_WITH(drivers-path,
     [AC_HELP_STRING([--with-drivers-path=[[path]]],
                     [drivers path])],
     [], [with_drivers_path="$libdir/dri"])

 LIBVA_DRIVERS_PATH="$with_drivers_path"
 AC_SUBST(LIBVA_DRIVERS_PATH)

 AC_DISABLE_STATIC
 AC_PROG_LIBTOOL
 AC_PROG_CC
 AC_PROG_CXX
 AM_PROG_CC_C_O
 AC_PROG_SED
 PKG_PROG_PKG_CONFIG

 AC_HEADER_STDC
 AC_SYS_LARGEFILE

 # Check for Doxygen
 if test "$enable_docs" = "yes"; then
     AC_CHECK_TOOL([DOXYGEN], [doxygen], [no])
     if test "$DOXYGEN" = "no"; then
        enable_docs="no"
     fi
 fi
 AM_CONDITIONAL(ENABLE_DOCS, test "$enable_docs" = "yes")

 # Check for va messaging
 if test "$enable_va_messaging" = "yes"; then
     AC_DEFINE([ENABLE_VA_MESSAGING], [1], [Defined to 1 if va messaging is needed])
 fi

 # Check for __attribute__((visibility()))
 AC_CACHE_CHECK([whether __attribute__((visibility())) is supported],
     ac_cv_have_gnuc_visibility_attribute,
     [cat > conftest.c <<EOF
 int foo __attribute__ ((visibility ("hidden"))) = 1;
 int bar __attribute__ ((visibility ("protected"))) = 1;
 EOF
     ac_cv_have_gnuc_visibility_attribute="no"
     if ${CC-cc} -Werror -S conftest.c -o conftest.s >/dev/null 2>&1; then
         if grep '\.hidden.*foo' conftest.s >/dev/null; then
             if grep '\.protected.*bar' conftest.s >/dev/null; then
                 ac_cv_have_gnuc_visibility_attribute="yes"
             fi
         fi
     fi
     rm -f conftest.[cs]
 ])
 if test "$ac_cv_have_gnuc_visibility_attribute" = "yes"; then
     AC_DEFINE([HAVE_GNUC_VISIBILITY_ATTRIBUTE], [1],
               [Defined to 1 if GCC visibility attribute is supported])
 fi

 # Check for -ldl (often not required)
 AC_SEARCH_LIBS([dlopen], [dl], [], [
   AC_MSG_ERROR([unable to find the dlopen() function])
 ])

 # Check for -fstack-protector
 ssp_cc=yes
 if test "X$CC-cc" != "X"; then
     AC_MSG_CHECKING([whether ${CC-cc} accepts -fstack-protector])
     ssp_old_cflags="$CFLAGS"
     CFLAGS="$CFLAGS -fstack-protector"
     AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[alloca(100);]])], [], [ssp_cc=no])
     AC_MSG_RESULT([$ssp_cc])
     if test "X$ssp_cc" = "Xno"; then
         CFLAGS="$ssp_old_cflags"
     else
         AC_DEFINE([ENABLE_SSP_CC], 1, [Define if SSP C support is enabled.])
     fi
 fi
 AM_CONDITIONAL(USE_SSP, test "$ssp_cc" = "yes")

 # Check for DRM (mandatory)
 LIBDRM_VERSION=libdrm_version
 PKG_CHECK_MODULES([DRM], [libdrm >= $LIBDRM_VERSION])
 AC_SUBST(LIBDRM_VERSION)

 USE_DRM="no"
 if test "$enable_drm" = "yes"; then
     USE_DRM="yes"
     AC_DEFINE([HAVE_VA_DRM], [1], [Defined to 1 if VA/DRM API is built])
 fi
 AM_CONDITIONAL(USE_DRM, test "$USE_DRM" = "yes")

 # Check for X11
 USE_X11="no"
 if test "x$enable_x11" != "xno"; then
     PKG_CHECK_MODULES([X11],    [x11 xext xfixes],    [USE_X11="yes"], [:])

     if test "x$USE_X11" = "xno" -a "x$enable_x11" = "xyes"; then
        AC_MSG_ERROR([VA/X11 explicitly enabled, however $X11_PKG_ERRORS])
     fi

     if test "$USE_X11" = "yes"; then
         AC_DEFINE([HAVE_VA_X11], [1], [Defined to 1 if VA/X11 API is built])
     fi
 fi
 AM_CONDITIONAL(USE_X11, test "$USE_X11" = "yes")

 # Check for GLX
 USE_GLX="no"

 if test "$USE_X11:$enable_glx" = "no:yes"; then
    AC_MSG_ERROR([VA/GLX explicitly enabled, but VA/X11 isn't built])
 fi

 if test "$USE_X11" = "yes" -a "$enable_glx" != "no"; then
     PKG_CHECK_MODULES([GLX], [gl x11], [USE_GLX="yes"], [:])
     saved_CPPFLAGS="$CPPFLAGS"
     saved_LIBS="$LIBS"
     CPPFLAGS="$CPPFLAGS $GLX_CFLAGS"
     LIBS="$LIBS $GLX_LIBS"
     AC_CHECK_HEADERS([GL/gl.h GL/glx.h], [:], [USE_GLX="no"])
     AC_CHECK_LIB([GL], [glXCreateContext], [:] [USE_GLX="no"])
     CPPFLAGS="$saved_CPPFLAGS"
     LIBS="$saved_LIBS"

     if test "x$USE_GLX" = "xno" -a "x$enable_glx" = "xyes"; then
        AC_MSG_ERROR([VA/GLX explicitly enabled, but libGL couldn't be found])
     fi

     if test "$USE_GLX" = "yes"; then
         AC_DEFINE([HAVE_VA_GLX], [1], [Defined to 1 if VA/GLX API is built])
     fi
 fi
 AM_CONDITIONAL(USE_GLX, test "$USE_GLX" = "yes")

 # Check for Wayland
 WAYLAND_API_VERSION=wayland_api_version
 AC_SUBST(WAYLAND_API_VERSION)

 USE_WAYLAND="no"
 if test "x$enable_wayland" != "xno"; then
     PKG_CHECK_MODULES([WAYLAND], [wayland-client >= wayland_api_version],
         [USE_WAYLAND="yes"], [:])

     if test "x$USE_WAYLAND" = "xno" -a "x$enable_wayland" = "xyes"; then
         AC_MSG_ERROR([wayland explicitly enabled, however $WAYLAND_PKG_ERRORS])
     fi

     if test "$USE_WAYLAND" = "yes"; then

         WAYLAND_PREFIX=`$PKG_CONFIG --variable=prefix wayland-client`
         AC_PATH_PROG([WAYLAND_SCANNER], [wayland-scanner],,
                      [${WAYLAND_PREFIX}/bin$PATH_SEPARATOR$PATH])
         if test "x$WAYLAND_SCANNER" = "x"; then
             AC_MSG_ERROR([wayland-scanner not found: Install it or use --disable-wayland])
         fi

         AC_DEFINE([HAVE_VA_WAYLAND], [1],
                   [Defined to 1 if VA/Wayland API is built])
     fi
 fi

 AM_CONDITIONAL(USE_WAYLAND, test "$USE_WAYLAND" = "yes")

 pkgconfigdir=${libdir}/pkgconfig
 AC_SUBST(pkgconfigdir)

 # Check for builds without backend
 if test "$USE_DRM:$USE_X11:$USE_WAYLAND" = "no:no:no"; then
     AC_MSG_ERROR([Please select at least one backend (DRM, X11, Wayland)])
 fi

 AC_OUTPUT([
     Makefile
     doc/Makefile
     pkgconfig/Makefile
     pkgconfig/libva-drm.pc
     pkgconfig/libva-glx.pc
     pkgconfig/libva-wayland.pc
     pkgconfig/libva-x11.pc
     pkgconfig/libva.pc
     va/Makefile
     va/drm/Makefile
     va/glx/Makefile
     va/va_version.h
     va/wayland/Makefile
     va/x11/Makefile
 ])

 # Print a small summary
 BACKENDS=""
 AS_IF([test x$USE_DRM = xyes], [BACKENDS="$BACKENDS drm"])
 AS_IF([test x$USE_X11 = xyes], [BACKENDS="$BACKENDS x11"])
 AS_IF([test x$USE_GLX = xyes], [BACKENDS="$BACKENDS glx"])
 AS_IF([test x$USE_WAYLAND = xyes], [BACKENDS="$BACKENDS wayland"])

 echo
 echo "libva - ${LIBVA_VERSION} (VA-API ${VA_API_VERSION})"
 echo
 echo Installation prefix .............. : $prefix
 echo Default driver path .............. : $LIBVA_DRIVERS_PATH
 echo Extra window systems ............. : $BACKENDS
 echo Build documentation .............. : $enable_docs
 echo Build with messaging ............. : $enable_va_messaging
 echo
	# Copyright (c) 2007 Intel Corporation. All Rights Reserved.
	#
	# Permission is hereby granted, free of charge, to any person obtaining a
	# copy of this software and associated documentation files (the
	# "Software"), to deal in the Software without restriction, including
	# without limitation the rights to use, copy, modify, merge, publish,
	# distribute, sub license, and/or sell copies of the Software, and to
	# permit persons to whom the Software is furnished to do so, subject to
	# the following conditions:
	#
	# The above copyright notice and this permission notice (including the
	# next paragraph) shall be included in all copies or substantial portions
	# of the Software.
	#
	# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
	# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
	# IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR
	# ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
	# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
	# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

	# VA-API version
	# - increment major for any ABI change
	# - increment minor for any interface change (e.g. new/modified function)
	# - increment micro for any other change (new flag, new codec definition, etc.)
	# - reset micro version to zero when minor version is incremented
	# - reset minor version to zero when major version is incremented
	m4_define([va_api_major_version], [1])
	m4_define([va_api_minor_version], [12])
	m4_define([va_api_micro_version], [0])

	m4_define([va_api_version],
	[va_api_major_version.va_api_minor_version.va_api_micro_version])

	# libva package version number, (as distinct from shared library version)
	# XXX: we want the package version to remain at 1.0.x for VA-API 0.32.y
	#
	# - major version is automatically generated from VA-API major version
	# - minor version is automatically generated from VA-API minor version
	# - increment micro for any library release
	# - reset micro version to zero when VA-API major or minor version is changed
	m4_define([libva_major_version], [m4_eval(va_api_major_version + 1)])
	m4_define([libva_minor_version], [m4_eval(va_api_minor_version)])
	m4_define([libva_micro_version], [0])
	m4_define([libva_pre_version], [0])

	m4_define([libva_version],
	[libva_major_version.libva_minor_version.libva_micro_version])
	m4_if(libva_pre_version, [0], [], [
	m4_append([libva_version], libva_pre_version, [.pre])
	])

	# libva library version number (generated, do not change)
	# XXX: we want the SONAME to remain at libva.so.1 for VA-API major == 0
	#
	# The library name is generated libva.<x>.<y>.0 where
	# <x> = VA-API major version + 1
	# <y> = 100 * VA-API minor version + VA-API micro version
	#
	# For example:
	# VA-API 0.32.0 generates libva.so.1.3200.0
	# VA-API 0.34.1 generates libva.so.1.3401.0
	# VA-API 1.2.13 generates libva.so.2.213.0
	m4_define([libva_interface_bias], [m4_eval(va_api_major_version + 1)])
	m4_define([libva_interface_age], [0])
	m4_define([libva_binary_age],
	[m4_eval(100 * va_api_minor_version + va_api_micro_version - libva_interface_age)])

	m4_define([libva_lt_current],
	[m4_eval(100 * va_api_minor_version + va_api_micro_version + libva_interface_bias)])
	m4_define([libva_lt_revision],
	[m4_eval(libva_interface_age)])
	m4_define([libva_lt_age],
	[m4_eval(libva_binary_age - libva_interface_age)])

	# libdrm minimun version requirement
	m4_define([libdrm_version], [2.4.60])

	# Wayland minimum version number
	# 1.11.0 for wl_proxy_create_wrapper
	m4_define([wayland_api_version], [1.11.0])

	AC_PREREQ(2.57)
	AC_INIT([libva],
	[libva_version],
	[https://github.com/intel/libva/issues/new],
	[libva],
	[https://github.com/intel/libva])

	AC_CONFIG_SRCDIR([Makefile.am])
	AC_CONFIG_MACRO_DIR([m4])
	AM_INIT_AUTOMAKE([dist-bzip2 -Wno-portability])

	AC_CONFIG_HEADERS([config.h])
	m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])

	TODAY="`LC_ALL=C date +'%a, %d %b %Y %X %z'`"
	AC_SUBST(TODAY)

	VA_API_MAJOR_VERSION=va_api_major_version
	VA_API_MINOR_VERSION=va_api_minor_version
	VA_API_MICRO_VERSION=va_api_micro_version
	VA_API_VERSION=va_api_version
	AC_SUBST(VA_API_MAJOR_VERSION)
	AC_SUBST(VA_API_MINOR_VERSION)
	AC_SUBST(VA_API_MICRO_VERSION)
	AC_SUBST(VA_API_VERSION)

	LIBVA_MAJOR_VERSION=libva_major_version
	LIBVA_MINOR_VERSION=libva_minor_version
	LIBVA_MICRO_VERSION=libva_micro_version
	LIBVA_VERSION=libva_version
	AC_SUBST(LIBVA_MAJOR_VERSION)
	AC_SUBST(LIBVA_MINOR_VERSION)
	AC_SUBST(LIBVA_MICRO_VERSION)
	AC_SUBST(LIBVA_VERSION)

	LIBVA_LT_CURRENT=libva_lt_current
	LIBVA_LT_REV=libva_lt_revision
	LIBVA_LT_AGE=libva_lt_age
	LIBVA_LT_VERSION="$LIBVA_LT_CURRENT:$LIBVA_LT_REV:$LIBVA_LT_AGE"
	LIBVA_LT_LDFLAGS="-version-info $LIBVA_LT_VERSION"
	AC_SUBST(LIBVA_LT_VERSION)
	AC_SUBST(LIBVA_LT_LDFLAGS)

	AC_ARG_ENABLE(docs,
	[AC_HELP_STRING([--enable-docs],
	[build Doxygen documentation @<:@default=no@:>@])],
	[], [enable_docs="no"])

	AC_ARG_ENABLE(drm,
	[AC_HELP_STRING([--enable-drm],
	[build with VA/DRM API support @<:@default=yes@:>@])],
	[], [enable_drm="yes"])

	AC_ARG_ENABLE(x11,
	[AC_HELP_STRING([--enable-x11],
	[build with VA/X11 API support @<:@default=auto@:>@])],
	[], [enable_x11="auto"])

	AC_ARG_ENABLE(glx,
	[AC_HELP_STRING([--enable-glx],
	[build with VA/GLX API support @<:@default=auto@:>@])],
	[], [enable_glx="auto"])

	AC_ARG_ENABLE([wayland],
	[AC_HELP_STRING([--enable-wayland],
	[build with VA/Wayland API support @<:@default=auto@:>@])],
	[], [enable_wayland="auto"])

	AC_ARG_ENABLE([va-messaging],
	[AC_HELP_STRING([--enable-va-messaging],
	[build with va info and error messaging @<:@default=yes@:>@])],
	[], [enable_va_messaging="yes"])

	AC_ARG_WITH(drivers-path,
	[AC_HELP_STRING([--with-drivers-path=[[path]]],
	[drivers path])],
	[], [with_drivers_path="$libdir/dri"])

	LIBVA_DRIVERS_PATH="$with_drivers_path"
	AC_SUBST(LIBVA_DRIVERS_PATH)

	AC_DISABLE_STATIC
	AC_PROG_LIBTOOL
	AC_PROG_CC
	AC_PROG_CXX
	AM_PROG_CC_C_O
	AC_PROG_SED
	PKG_PROG_PKG_CONFIG

	AC_HEADER_STDC
	AC_SYS_LARGEFILE

	# Check for Doxygen
	if test "$enable_docs" = "yes"; then
	AC_CHECK_TOOL([DOXYGEN], [doxygen], [no])
	if test "$DOXYGEN" = "no"; then
	enable_docs="no"
	fi
	fi
	AM_CONDITIONAL(ENABLE_DOCS, test "$enable_docs" = "yes")

	# Check for va messaging
	if test "$enable_va_messaging" = "yes"; then
	AC_DEFINE([ENABLE_VA_MESSAGING], [1], [Defined to 1 if va messaging is needed])
	fi

	# Check for __attribute__((visibility()))
	AC_CACHE_CHECK([whether __attribute__((visibility())) is supported],
	ac_cv_have_gnuc_visibility_attribute,
	[cat > conftest.c <<EOF
	int foo __attribute__ ((visibility ("hidden"))) = 1;
	int bar __attribute__ ((visibility ("protected"))) = 1;
	EOF
	ac_cv_have_gnuc_visibility_attribute="no"
	if ${CC-cc} -Werror -S conftest.c -o conftest.s >/dev/null 2>&1; then
	if grep '\.hidden.*foo' conftest.s >/dev/null; then
	if grep '\.protected.*bar' conftest.s >/dev/null; then
	ac_cv_have_gnuc_visibility_attribute="yes"
	fi
	fi
	fi
	rm -f conftest.[cs]
	])
	if test "$ac_cv_have_gnuc_visibility_attribute" = "yes"; then
	AC_DEFINE([HAVE_GNUC_VISIBILITY_ATTRIBUTE], [1],
	[Defined to 1 if GCC visibility attribute is supported])
	fi

	# Check for -ldl (often not required)
	AC_SEARCH_LIBS([dlopen], [dl], [], [
	AC_MSG_ERROR([unable to find the dlopen() function])
	])

	# Check for -fstack-protector
	ssp_cc=yes
	if test "X$CC-cc" != "X"; then
	AC_MSG_CHECKING([whether ${CC-cc} accepts -fstack-protector])
	ssp_old_cflags="$CFLAGS"
	CFLAGS="$CFLAGS -fstack-protector"
	AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[alloca(100);]])], [], [ssp_cc=no])
	AC_MSG_RESULT([$ssp_cc])
	if test "X$ssp_cc" = "Xno"; then
	CFLAGS="$ssp_old_cflags"
	else
	AC_DEFINE([ENABLE_SSP_CC], 1, [Define if SSP C support is enabled.])
	fi
	fi
	AM_CONDITIONAL(USE_SSP, test "$ssp_cc" = "yes")

	# Check for DRM (mandatory)
	LIBDRM_VERSION=libdrm_version
	PKG_CHECK_MODULES([DRM], [libdrm >= $LIBDRM_VERSION])
	AC_SUBST(LIBDRM_VERSION)

	USE_DRM="no"
	if test "$enable_drm" = "yes"; then
	USE_DRM="yes"
	AC_DEFINE([HAVE_VA_DRM], [1], [Defined to 1 if VA/DRM API is built])
	fi
	AM_CONDITIONAL(USE_DRM, test "$USE_DRM" = "yes")

	# Check for X11
	USE_X11="no"
	if test "x$enable_x11" != "xno"; then
	PKG_CHECK_MODULES([X11], [x11 xext xfixes], [USE_X11="yes"], [:])

	if test "x$USE_X11" = "xno" -a "x$enable_x11" = "xyes"; then
	AC_MSG_ERROR([VA/X11 explicitly enabled, however $X11_PKG_ERRORS])
	fi

	if test "$USE_X11" = "yes"; then
	AC_DEFINE([HAVE_VA_X11], [1], [Defined to 1 if VA/X11 API is built])
	fi
	fi
	AM_CONDITIONAL(USE_X11, test "$USE_X11" = "yes")

	# Check for GLX
	USE_GLX="no"

	if test "$USE_X11:$enable_glx" = "no:yes"; then
	AC_MSG_ERROR([VA/GLX explicitly enabled, but VA/X11 isn't built])
	fi

	if test "$USE_X11" = "yes" -a "$enable_glx" != "no"; then
	PKG_CHECK_MODULES([GLX], [gl x11], [USE_GLX="yes"], [:])
	saved_CPPFLAGS="$CPPFLAGS"
	saved_LIBS="$LIBS"
	CPPFLAGS="$CPPFLAGS $GLX_CFLAGS"
	LIBS="$LIBS $GLX_LIBS"
	AC_CHECK_HEADERS([GL/gl.h GL/glx.h], [:], [USE_GLX="no"])
	AC_CHECK_LIB([GL], [glXCreateContext], [:] [USE_GLX="no"])
	CPPFLAGS="$saved_CPPFLAGS"
	LIBS="$saved_LIBS"

	if test "x$USE_GLX" = "xno" -a "x$enable_glx" = "xyes"; then
	AC_MSG_ERROR([VA/GLX explicitly enabled, but libGL couldn't be found])
	fi

	if test "$USE_GLX" = "yes"; then
	AC_DEFINE([HAVE_VA_GLX], [1], [Defined to 1 if VA/GLX API is built])
	fi
	fi
	AM_CONDITIONAL(USE_GLX, test "$USE_GLX" = "yes")

	# Check for Wayland
	WAYLAND_API_VERSION=wayland_api_version
	AC_SUBST(WAYLAND_API_VERSION)

	USE_WAYLAND="no"
	if test "x$enable_wayland" != "xno"; then
	PKG_CHECK_MODULES([WAYLAND], [wayland-client >= wayland_api_version],
	[USE_WAYLAND="yes"], [:])

	if test "x$USE_WAYLAND" = "xno" -a "x$enable_wayland" = "xyes"; then
	AC_MSG_ERROR([wayland explicitly enabled, however $WAYLAND_PKG_ERRORS])
	fi

	if test "$USE_WAYLAND" = "yes"; then

	WAYLAND_PREFIX=`$PKG_CONFIG --variable=prefix wayland-client`
	AC_PATH_PROG([WAYLAND_SCANNER], [wayland-scanner],,
	[${WAYLAND_PREFIX}/bin$PATH_SEPARATOR$PATH])
	if test "x$WAYLAND_SCANNER" = "x"; then
	AC_MSG_ERROR([wayland-scanner not found: Install it or use --disable-wayland])
	fi

	AC_DEFINE([HAVE_VA_WAYLAND], [1],
	[Defined to 1 if VA/Wayland API is built])
	fi
	fi

	AM_CONDITIONAL(USE_WAYLAND, test "$USE_WAYLAND" = "yes")

	pkgconfigdir=${libdir}/pkgconfig
	AC_SUBST(pkgconfigdir)

	# Check for builds without backend
	if test "$USE_DRM:$USE_X11:$USE_WAYLAND" = "no:no:no"; then
	AC_MSG_ERROR([Please select at least one backend (DRM, X11, Wayland)])
	fi

	AC_OUTPUT([
	Makefile
	doc/Makefile
	pkgconfig/Makefile
	pkgconfig/libva-drm.pc
	pkgconfig/libva-glx.pc
	pkgconfig/libva-wayland.pc
	pkgconfig/libva-x11.pc
	pkgconfig/libva.pc
	va/Makefile
	va/drm/Makefile
	va/glx/Makefile
	va/va_version.h
	va/wayland/Makefile
	va/x11/Makefile
	])

	# Print a small summary
	BACKENDS=""
	AS_IF([test x$USE_DRM = xyes], [BACKENDS="$BACKENDS drm"])
	AS_IF([test x$USE_X11 = xyes], [BACKENDS="$BACKENDS x11"])
	AS_IF([test x$USE_GLX = xyes], [BACKENDS="$BACKENDS glx"])
	AS_IF([test x$USE_WAYLAND = xyes], [BACKENDS="$BACKENDS wayland"])

	echo
	echo "libva - ${LIBVA_VERSION} (VA-API ${VA_API_VERSION})"
	echo
	echo Installation prefix .............. : $prefix
	echo Default driver path .............. : $LIBVA_DRIVERS_PATH
	echo Extra window systems ............. : $BACKENDS
	echo Build documentation .............. : $enable_docs
	echo Build with messaging ............. : $enable_va_messaging
	echo