ObjFW  Check-in [ff165576a6]

	AC_SUBST(OFBLOCKTESTS_M, "OFBlockTests.m")
	AC_MSG_RESULT(yes)
], [
	AC_MSG_RESULT(no)
	OBJCFLAGS="$old_OBJCFLAGS"
])

AC_CHECK_HEADERS([objfw-rt.h objc/objc.h])

test x"$ac_cv_header_objfw_rt_h" = x"yes" && objc_runtime="ObjFW-RT"

AC_MSG_CHECKING(which Objective C runtime we use)
objc_runtime="ObjFW runtime"
AC_CHECK_HEADER(objc/objc.h)
AC_MSG_CHECKING(which Objective C runtime to use)
AS_IF([test x"$ac_cv_header_objc_objc_h" = x"yes"], [
	dnl Only accept it if it's from gcc >= 4.7, as the one in 4.6 is buggy
	dnl when using the new API.
	AC_EGREP_CPP(yes, [
		#import <objc/objc.h>
		#if defined(__GNU_LIBOBJC__) && __GNU_LIBOBJC__ >= 20110608
		yes
		#endif
	], [
		test x"$objc_runtime" = x"" && objc_runtime="GNU"
	], [
		dnl TODO: This is ugly. Let's think of a better check.
		AC_EGREP_CPP(yes, [
			#import <objc/objc.h>
			#ifdef __objc_INCLUDE_GNU
			yes
			#endif
		], [
			test x"$objc_runtime" = x"" && objc_runtime="old GNU"
		], [
			objc_runtime="Apple"
		])
	])
	dnl TODO: This is ugly. Let's think of a better check.
	AC_EGREP_CPP(yes, [
		#import <objc/objc.h>
		#ifdef __objc_INCLUDE_GNU
		yes
		#endif
	], [
		dnl We don't want the GNU runtime
	], [
		objc_runtime="Apple runtime"
	])
])
])
AC_MSG_RESULT($objc_runtime)

case $objc_runtime in
	ObjFW-RT)
	"ObjFW runtime")
		AC_DEFINE(OF_OBJFW_RUNTIME, 1,
			[Whether we use the ObjFW runtime])
		AC_SUBST(GNU_RUNTIME, "-fgnu-runtime")
		OBJCFLAGS="$OBJCFLAGS -fgnu-runtime"

		AC_CHECK_LIB(objfw-rt, objc_msg_lookup, [
			LIBS="-lobjfw-rt $LIBS"
		], [
			AC_MSG_ERROR([libobjfw-rt not found!])
		])
		;;
	Apple)
	"Apple runtime")
		AC_DEFINE(OF_APPLE_RUNTIME, 1,
			[Whether we use the Apple ObjC runtime])

		AC_CHECK_LIB(objc, objc_msgSend, [
			LIBS="-lobjc $LIBS"
		], [
			AC_MSG_ERROR([libobjc not found!])
		])
		;;
	GNU)
		AC_DEFINE(OF_GNU_RUNTIME, 1,
			[Whether we use the GNU ObjC runtime])

		AC_CHECK_LIB(objc, objc_msg_lookup, [
			LIBS="-lobjc $LIBS"
		], [
			AC_MSG_ERROR([libobjc not found!])
		])
		;;
	"old GNU")
		AC_DEFINE(OF_OLD_GNU_RUNTIME, 1,
			[Whether we use the old GNU ObjC runtime])

		AC_CHECK_LIB(objc, objc_msg_lookup, [
			LIBS="-lobjc $LIBS"
		], [
			AC_MSG_ERROR([libobjc not found!])
		])
		;;
	*)
		AC_MSG_RESULT(none)
		AC_MSG_ERROR(No ObjC runtime found! Please install ObjFW-RT!)
		;;
esac

AC_CHECK_FUNC(objc_getProperty,, [
	AC_DEFINE(NEED_OBJC_PROPERTIES_INIT, 1,
		[Whether objc_properties_init needs to be called])
	AC_SUBST(OBJC_PROPERTIES_M, "objc_properties.m")
])

		AC_MSG_RESULT($have_threadsafe_getaddrinfo)
	])
], [
	AC_MSG_RESULT(no)
])

AS_IF([test x"$objc_runtime" = x"Apple"], [
AS_IF([test x"$objc_runtime" = x"Apple runtime"], [
	AC_CHECK_HEADER(Foundation/NSObject.h, [
		AC_SUBST(FOUNDATION_COMPAT_M, "foundation-compat.m")
	])
])

AS_IF([test x"$GOBJC" = x"yes"], [
	OBJCFLAGS="$OBJCFLAGS -Wwrite-strings -Wpointer-arith -Werror"