ObjFW  Artifact [235ed393ab]

Artifact 235ed393ab32cc45d2a72ef7fb02df4f76cb2c7d18e70c39b71a9b5ed4ee7a93:

• File configure.ac — part of check-in [546332b4d7] at 2011-08-03 03:53:03 on branch trunk — Always use the old GNU API, even with the new GNU runtime.

  The new API of the new GNU runtime is currently too broken to be of any
  use, thus we even use the old API when the new one is detected until
  the new one has been fixed and offers a way to detect if it is the fixed
  one. (user: js, size: 15971) [annotate] [blame] [check-ins using]

AC_INIT(ObjFW, 0.6-dev, js@webkeks.org)
AC_CONFIG_SRCDIR(src)

AS_IF([test x"$host" = x"psp"], [
	OBJCFLAGS="-G0 $OBJCFLAGS"
	LIBS="$LIBS -lpspdebug -lpspdisplay -lpspge -lpspctrl -lpspsdk -lc"
	LIBS="$LIBS -lpspnet -lpspnet_inet -lpspnet_apctl -lpspnet_resolver"
	LIBS="$LIBS -lpsputility -lpspuser -lpspkernel"
])

AC_CANONICAL_HOST

AC_LANG([Objective C])
AC_PROG_OBJC
AC_PROG_OBJCPP
AC_PROG_LN_S
AC_PROG_INSTALL
AC_PROG_EGREP

CPP="$OBJCPP"
CPPFLAGS="$CPPFLAGS $OBJCPPFLAGS"
OBJCFLAGS="$OBJCFLAGS -Wall -fexceptions -fobjc-exceptions"
OBJCFLAGS="$OBJCFLAGS -fconstant-string-class=OFConstantString"

AX_CHECK_COMPILER_FLAGS(-std=gnu99, [OBJCFLAGS="$OBJCFLAGS -std=gnu99"])
AX_CHECK_COMPILER_FLAGS([-fgnu89-inline -Werror],
	[OBJCFLAGS="$OBJCFLAGS -fgnu89-inline"])
AX_CHECK_COMPILER_FLAGS(-pipe, [OBJCFLAGS="$OBJCFLAGS -pipe"])
AX_CHECK_COMPILER_FLAGS(-fno-common, [OBJCFLAGS="$OBJCFLAGS -fno-common"])
AX_CHECK_COMPILER_FLAGS(-fno-constant-cfstrings, [
	OBJCFLAGS="$OBJCFLAGS -fno-constant-cfstrings"
	AC_SUBST(NO_CONST_CFSTRINGS, "-fno-constant-cfstrings")
])
AX_CHECK_COMPILER_FLAGS(-Wshorten-64-to-32,
	[OBJCFLAGS="$OBJCFLAGS -Wshorten-64-to-32"])
AX_CHECK_COMPILER_FLAGS(-Wsemicolon-before-method-body,
	[OBJCFLAGS="$OBJCFLAGS -Wsemicolon-before-method-body"])

AC_MSG_CHECKING(whether Objective C compiler supports fast enumeration)
AC_TRY_COMPILE([
	@protocol OFFastEnumeration
	- (int)countByEnumeratingWithState: (void*)state
				   objects: (id*)objects
				     count: (int)count;
	@end
], [
	id n = (id)0;
	for (id i in n);
], [
	AC_DEFINE(OF_HAVE_FAST_ENUMERATION, 1,
		[Compiler support for Fast Enumeration])
	AC_MSG_RESULT(yes)
], [
	AC_MSG_RESULT(no)
])

AC_MSG_CHECKING(whether Objective C compiler supports properties)
AC_TRY_COMPILE([
	@interface Foo
	{
		id bar;
	}

	@property (retain, nonatomic) id bar;
	@end
], [
	Foo *foo = (id)0;
	[foo setBar: (id)0];
	[foo bar];
], [
	AC_DEFINE(OF_HAVE_PROPERTIES, 1, [Compiler support for properties])
	AC_SUBST(PROPERTIESTESTS_M, "PropertiesTests.m")
	AC_MSG_RESULT(yes)
], [
	AC_MSG_RESULT(no)
])

AC_MSG_CHECKING(whether Objective C compiler supports optional protocols)
AC_TRY_COMPILE([
	@protocol Proto
	@optional
	+ (void)foo;
	@end

	@interface Foo <Proto>
	@end

	@implementation Foo
	@end
], [
	[Foo foo];
], [
	AC_DEFINE(OF_HAVE_OPTIONAL_PROTOCOLS, 1,
		[Compiler support for optional protocols])
	AC_MSG_RESULT(yes)
], [
	AC_MSG_RESULT(no)
])

AC_MSG_CHECKING(whether Objective C compiler supports blocks)
old_OBJCFLAGS="$OBJCFLAGS"
OBJCFLAGS="$OBJCFLAGS -fblocks"
AC_TRY_COMPILE([], [
	int (^foo)(int bar);
	foo = ^ (int bar) { return 0; }
], [
	AC_DEFINE(OF_HAVE_BLOCKS, 1, [Compiler support for blocks])
	AC_SUBST(BLOCKS_FLAGS, "-fblocks")
	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)
AS_IF([test x"$ac_cv_header_objc_objc_h" = x"yes"], [
	AC_EGREP_CPP(yes, [
		#import <objc/objc.h>
		#ifdef __GNU_LIBOBJC__
		yes
		#endif
	], [
		test x"$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"$objc_runtime" = x"" && objc_runtime="old GNU"
		], [
			objc_runtime="Apple"
		])
	])
])
AC_MSG_RESULT($objc_runtime)

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

		AC_CHECK_LIB(objfw-rt, objc_msg_lookup, [
			LIBS="-lobjfw-rt $LIBS"
		], [
			AC_MSG_ERROR([libobjfw-rt not found!])
		])
		;;
	Apple)
		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)
		# The new API of the new GNU runtime is currently too broken to
		# be of any use, thus we even use the old API when the new one
		# is detected until the new one has been fixed and offers a way
		# to detect if it is the fixed one.
		dnl AC_DEFINE(OF_GNU_RUNTIME, 1,
		dnl	[Whether we use the GNU ObjC runtime])
		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!])
		])
		;;
	"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_CHECK_FUNC(objc_enumerationMutation, [
	AC_DEFINE(HAVE_OBJC_ENUMERATIONMUTATION, 1,
		[Whether we have objc_enumerationMutation])
])

AC_CHECK_TOOL(AR, ar)
AC_PROG_RANLIB
AC_ARG_ENABLE(shared,
	AS_HELP_STRING([--disable-shared], [do not build shared library]))
AS_IF([test x"$enable_shared" != x"no"], [
	BUILDSYS_SHARED_LIB
	AC_SUBST(OBJFW_SHARED_LIB, "${LIB_PREFIX}objfw${LIB_SUFFIX}")
	AC_SUBST(EXCEPTIONS_LIB_A, "exceptions.lib.a")
	AC_SUBST(EXCEPTIONS_EXCEPTIONS_LIB_A, "exceptions/exceptions.lib.a")
])
AC_ARG_ENABLE(static, AS_HELP_STRING([--enable-static], [build static library]))
AS_IF([test x"$enable_static" = x"yes" -o x"$enable_shared" = x"no"], [
	AC_SUBST(OBJFW_STATIC_LIB, "libobjfw.a")
	AC_SUBST(EXCEPTIONS_A, "exceptions.a")
	AC_SUBST(EXCEPTIONS_EXCEPTIONS_A, "exceptions/exceptions.a")
])

AC_DEFINE_UNQUOTED(PLUGIN_SUFFIX, "$PLUGIN_SUFFIX", [Suffix for plugins])
AS_IF([test x"$PLUGIN_SUFFIX" != x""], [
	AC_SUBST(OFPLUGIN_M, "OFPlugin.m")
	AC_SUBST(OFPLUGINTESTS_M, "OFPluginTests.m")
	AC_SUBST(TESTPLUGIN, "plugin")
	AC_DEFINE(OF_PLUGINS, 1, [Whether we have plugin support])
	AC_SUBST(OFPLUGINS_DEF, "-DOF_PLUGINS")
])

case "$host_os" in
	darwin*)
		AC_SUBST(REEXPORT_LIBOBJC, ["-Wl,-reexport-lobjc"])
		AC_SUBST(LDFLAGS_REEXPORT, ["-Wl,-reexport-lobjfw"])
		AC_SUBST(MACH_ALIAS_LIST,
			 ["-Xarch_x86_64 -Wl,-alias_list,mach_alias_list"])
		;;
esac

AC_C_BIGENDIAN([
	AC_DEFINE(OF_BIG_ENDIAN, 1, [Whether we are big endian])
])

AC_MSG_CHECKING(for SIZE_MAX)
AC_EGREP_CPP(yes, [
	#include <stdint.h>
	#include <limits.h>

	#ifdef SIZE_MAX
	yes
	#endif
], [
	AC_MSG_RESULT(yes)
], [
	AC_MSG_RESULT(no)
	AC_MSG_CHECKING(for SIZE_T_MAX)
	AC_EGREP_CPP(yes, [
		#include <stdint.h>
		#include <limits.h>

		#ifdef SIZE_T_MAX
		yes
		#endif
	], [
		AC_MSG_RESULT(yes)
		size_max="SIZE_T_MAX"
	], [
		AC_MSG_RESULT(no)
		size_max="(~(size_t)0)"
	])
	AC_DEFINE_UNQUOTED(SIZE_MAX, $size_max, [Maximum value for size_t])
])

AC_CHECK_SIZEOF(float)
AC_CHECK_SIZEOF(double)
AS_IF([test x"$ac_cv_sizeof_float" != x"4" -o x"$ac_cv_sizeof_double" != x"8"],
	[AC_MSG_ERROR(
		[Floating point implementation does not conform to IEEE 754!])])

AC_MSG_CHECKING(for floating point endianess)
fp_endianess="unknown"
AC_TRY_COMPILE([
	double endianess = 184092775106.859375;
], [
], [
	AS_IF([$EGREP BEndian conftest.$ac_objext >/dev/null], [
		AC_DEFINE(OF_FLOAT_BIG_ENDIAN, 1,
			[Whether floats are big endian])
		fp_endianess="big endian"
	], [
		AS_IF([$EGREP naidnEB conftest.$ac_objext >/dev/null], [
			fp_endianess="little endian"
		])
	])
])
AC_MSG_RESULT($fp_endianess)
AS_IF([test x"$fp_endianess" = x"unknown"], [
	AC_MSG_ERROR(
		[Floating point implementation does not conform to IEEE 754!])])

AC_CHECK_LIB(m, fmod, LIBS="$LIBS -lm")

AC_MSG_CHECKING(for M_PI)
AC_EGREP_CPP(yes, [
	#include <math.h>

	#ifdef M_PI
	yes
	#endif
], [
	AC_MSG_RESULT(yes)
], [
	AC_MSG_RESULT(no)
	AC_DEFINE(M_PI, 3.141592653589793238462643, [Precalculated Pi])
])

AC_CHECK_FUNC(asprintf, [
	case "$host" in
		*-psp-*)
			dnl asprintf is broken on the PSP, but snprintf works.
			have_asprintf="no"
			AC_SUBST(ASPRINTF_M, "asprintf.m")
			ac_cv_snprintf_useful_ret="yes"
			;;
		*)
			have_asprintf="yes"
			AC_DEFINE(OF_HAVE_ASPRINTF, 1,
				[Whether we have asprintf])
			AC_SUBST(ASPRINTF_DEF, "-DOF_HAVE_ASPRINTF")
		;;
	esac
], [
	have_asprintf="no"
	AC_SUBST(ASPRINTF_M, "asprintf.m")

	AC_MSG_CHECKING(whether snprintf returns something useful)
	AC_CACHE_VAL(ac_cv_snprintf_useful_ret, [
		AC_TRY_RUN([
			#include <stdio.h>

			int
			main()
			{
				return (snprintf(NULL, 0, "asd") == 3 ? 0 : 1);
			}
		], [
			ac_cv_snprintf_useful_ret="yes"
		], [
			ac_cv_snprintf_useful_ret="no"
		], [
			ac_cv_snprintf_useful_ret="no"
		])
	])
	AC_MSG_RESULT($ac_cv_snprintf_useful_ret)
])
test x"$have_asprintf" != x"yes" -a x"$ac_cv_snprintf_useful_ret" != x"yes" && \
	AC_MSG_ERROR(No asprintf and no snprintf returning required space!)

AC_CHECK_LIB(dl, dlopen, LIBS="$LIBS -ldl")

AC_ARG_ENABLE(threads,
	AS_HELP_STRING([--disable-threads], [disable thread support]))
AS_IF([test x"$enable_threads" != x"no"], [
	case "$host_os" in
	mingw*)
		AC_MSG_CHECKING(for threads)
		AC_MSG_RESULT(WinAPI)
		;;
	*)
		ACX_PTHREAD([
			CPPLAGS="$CPPFLAGS $PTHREAD_CFLAGS"
			LIBS="$LIBS $PTHREAD_LIBS"
			AC_DEFINE(OF_HAVE_PTHREADS, 1,
				[Whether we have pthreads])
			AC_CHECK_FUNC(pthread_spin_lock, [
				AC_DEFINE(OF_HAVE_PTHREAD_SPINLOCKS, 1,
					[Whether we have pthread spinlocks])
			])
			AC_CHECK_FUNC(sched_yield, [
				AC_DEFINE(OF_HAVE_SCHED_YIELD, 1,
					[Whether we have sched_yield])
			])
		], [
			AC_MSG_ERROR(No supported threads found!)
		])
		;;
	esac

	AC_DEFINE(OF_THREADS, 1, [Whether we have threads])
	AC_SUBST(OFTHREAD_M, "OFThread.m")
	AC_SUBST(OFTHREADTESTS_M, "OFThreadTests.m")
	AC_SUBST(OFHTTPREQUESTTESTS_M, "OFHTTPRequestTests.m")
	AC_SUBST(THREADING_H, "threading.h")

	AC_CHECK_FUNC(objc_sync_enter,, [
		AC_SUBST(OBJC_SYNC_M, "objc_sync.m")
		AC_DEFINE(NEED_OBJC_SYNC_INIT, 1,
			[Whether objc_sync_init needs to be called])
	])

	atomic_ops="none"

	AC_MSG_CHECKING(whether we have an atomic ops assembly implementation)
	AC_EGREP_CPP(yes, [
		#if defined(__GNUC__) && (defined(__i386__) || \
		    defined(__amd64__) || defined(__x86_64__))
		yes
		#endif
	], [
		AC_MSG_RESULT(yes)
		atomic_ops="assembly implementation"
	], [
		AC_MSG_RESULT(no)
	])

	AC_MSG_CHECKING(whether __sync_* works)
	AC_TRY_LINK([#include <stdint.h>], [
		int32_t i, j;
		if (__sync_add_and_fetch(&i, 1))
			j = __sync_sub_and_fetch(&i, 1);
		while (!__sync_bool_compare_and_swap(&i, 0, 1));
	], [
		AC_MSG_RESULT(yes)
		test x"$atomic_ops" = x"none" && atomic_ops="gcc builtins"
		AC_DEFINE(OF_HAVE_GCC_ATOMIC_OPS, 1,
			[Whether gcc atomic operations are available])
	], [
		AC_MSG_RESULT(no)
	])

	AC_CHECK_HEADER(libkern/OSAtomic.h, [
		test x"$atomic_ops" = x"none" && atomic_ops="libkern/OSAtomic.h"
		AC_DEFINE(OF_HAVE_OSATOMIC, 1,
			[Whether we have libkern/OSAtomic.h])
		AC_CHECK_FUNC(OSAtomicAdd64Barrier, [
			AC_DEFINE(OF_HAVE_OSATOMIC_64, 1,
				[Whether we have OSAtomic*64])
		])
	])
], [
	dnl We can only have one thread - therefore everything is atomic
	atomic_ops="not needed"
])

AC_MSG_CHECKING(for atomic operations)
AS_IF([test x"$atomic_ops" != x"none"], [
	AC_DEFINE(OF_ATOMIC_OPS, 1, [Whether we have atomic operations])
	AC_SUBST(ATOMIC_H, "atomic.h")
])
AC_MSG_RESULT($atomic_ops)

AC_CHECK_LIB(socket, socket, LIBS="$LIBS -lsocket")
AC_CHECK_LIB(network, socket, LIBS="$LIBS -lnetwork")
AC_CHECK_LIB(ws2_32, main, LIBS="$LIBS -lws2_32")

AC_CHECK_FUNC(gmtime_r, [
	AC_DEFINE(HAVE_GMTIME_R, 1, [Whether we have gmtime_r])
])
AC_CHECK_FUNC(localtime_r, [
	AC_DEFINE(HAVE_LOCALTIME_R, 1, [Whether we have localtime_r])
])

AC_CHECK_HEADER(poll.h, [
	AC_DEFINE(OF_HAVE_POLL, 1, [Whether poll is supported])
])
AC_CHECK_HEADERS(sys/select.h, [
	AC_DEFINE(OF_HAVE_SYS_SELECT_H, 1, [Whether we have sys/select.h])
])

AC_MSG_CHECKING(for getaddrinfo)
AC_TRY_COMPILE([
	#include <stddef.h>
	#ifndef _WIN32
	# include <sys/types.h>
	# include <sys/socket.h>
	# include <netdb.h>
	#else
	# define _WIN32_WINNT 0x0501
	# include <windows.h>
	# include <ws2tcpip.h>
	#endif
], [
	struct addrinfo ai;
	getaddrinfo(NULL, NULL, NULL, NULL);
], [
	AC_MSG_RESULT(yes)
	AC_DEFINE(HAVE_GETADDRINFO, 1, [Whether we have getaddrinfo])

	AS_IF([test x"$enable_threads" != x"no"], [
		AC_MSG_CHECKING(whether getaddrinfo is thread-safe)

		case "$host_os" in
			darwin[[12345]].*)
				have_threadsafe_getaddrinfo="no"
				;;
			darwin*)
				have_threadsafe_getaddrinfo="yes"
				;;
			freebsd[[1234]].* | freebsd5.[[1234]]*)
				have_threadsafe_getaddrinfo="no"
				;;
			freebsd*)
				have_threadsafe_getaddrinfo="yes"
				;;
			netbsd[[123]].*)
				have_threadsafe_getaddrinfo="no"
				;;
			netbsd*)
				have_threadsafe_getaddrinfo="yes"
				;;
			solaris*)
				have_threadsafe_getaddrinfo="yes"
				;;
			*)
				have_threadsafe_getaddrinfo="unknown"
				;;
		esac

		AS_IF([test x"$have_threadsafe_getaddrinfo" = x"unknown"], [
			AC_EGREP_CPP(yes, [
				#ifndef _WIN32
				# include <sys/types.h>
				# include <sys/socket.h>
				# include <netdb.h>
				#else
				# define _WIN32_WINNT 0x0501
				# include <windows.h>
				# include <ws2tcpip.h>
				#endif

				#ifdef h_errno
				yes
				#end
			], [
				have_threadsafe_getaddrinfo="yes"
			], [
				have_threadsafe_getaddrinfo="no"
			])
		])

		AS_IF([test x"$have_threadsafe_getaddrinfo" = x"yes"], [
			AC_DEFINE(HAVE_THREADSAFE_GETADDRINFO, 1,
				[Whether getaddrinfo is thread-safe])
		])

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

AC_CHECK_FUNC(madvise, [
	AC_DEFINE(HAVE_MADVISE, 1, [Whether we have madvise])
])

AS_IF([test x"$objc_runtime" = x"Apple"], [
	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"

	AC_MSG_CHECKING(whether gcc has bug objc/27438)
	AC_TRY_COMPILE([
		@interface OFConstantString
		{
			struct objc_class *isa;
			const char *string;
			unsigned long size;
		}
		@end

		void *_OFConstantStringClassReference;
	], [
		OFConstantString *test = @"";
		(void)test; /* Get rid of unused variable warning */
	], [
		AC_MSG_RESULT(no)
	], [
		AC_MSG_RESULT([yes, adding -Wno-unused-variable])
		OBJCFLAGS="$OBJCFLAGS -Wno-unused-variable"
		AC_SUBST(NO_WARN_UNUSED, "-Wno-unused-variable")
	])

	AC_MSG_CHECKING(whether we need -Wno-strict-aliasing due to gcc bugs)
	AC_TRY_COMPILE([
		@interface Foo
		{
			struct objc_class *isa;
		}
		@end

		static struct {
			struct objc_class *isa;
		} object;
	], [
		Foo *test = (Foo*)&object;
		(void)test; /* Get rid of unused variable warning */
	], [
		AC_MSG_RESULT(no)
	], [
		AC_MSG_RESULT(yes)
		OBJCFLAGS="$OBJCFLAGS -Wno-strict-aliasing"
	])

	old_OBJCFLAGS="$OBJCFLAGS"
	OBJCFLAGS="$OBJCFLAGS -Wcast-align"
	AC_MSG_CHECKING(whether -Wcast-align is buggy)
	AC_TRY_COMPILE([
		@interface Foo
		{
			struct objc_class *isa;
		}
		@end

		@implementation Foo
		- (void)foo
		{
			struct objc_class *c = isa;
			(void)c;
		}
		@end
	], [
	], [
		AC_MSG_RESULT(no)
	], [
		AC_MSG_RESULT(yes)
		OBJCFLAGS="$old_OBJCFLAGS"
	])
])

AS_IF([test x"$cross_compiling" = x"yes"], [
	AC_SUBST(BIN_PREFIX, "$host-")

	case "$host" in
		*-*-mingw*)
			AC_CHECK_PROG(WINE, wine, wine)

			AS_IF([test x"$WINE" != x""], [
				AC_SUBST(TESTS, "tests")
				AC_SUBST(TEST_LAUNCHER, "$WINE")
			])
			;;
	esac
], [
	AC_SUBST(TESTS, "tests")
])

BUILDSYS_INIT
BUILDSYS_TOUCH_DEPS

dnl We don't call AC_PROG_CPP, but only AC_PROG_OBJCPP and set CPP to OBJCPP
dnl and add OBJCPPFLAGS to CPPFLAGS, thus we need to AC_SUBST these ourself.
AC_SUBST(CPP)
AC_SUBST(CPPFLAGS)

AC_SUBST(PACKAGE, ObjFW)
AC_CONFIG_FILES([buildsys.mk extra.mk utils/objfw-config])
AC_CONFIG_HEADERS([config.h src/objfw-defs.h])
AC_OUTPUT