ObjFW  configure.ac at [fd4a416f66]

File configure.ac artifact b0a12988ad part of check-in fd4a416f66


AC_INIT(ObjFW, 0.9-dev, js@heap.zone)
BUILDSYS_INIT

AS_IF([test configure.ac -nt configure], [
	AC_MSG_ERROR([configure.ac is newer than configure! Run autoreconf!])
])

AC_CONFIG_SRCDIR(src)
AC_CONFIG_MACRO_DIR(m4)
AC_CONFIG_AUX_DIR(build-aux)

AC_CANONICAL_HOST

dnl Used to disable checking for -pedantic on some platforms where it's broken
check_pedantic="yes"

case "$host" in
	*-msdosdjgpp*)
		enable_shared="no"
		enable_threads="no"
		enable_sockets="no"
		;;
	*-psp-*)
		AS_IF([test x"$DEVKITPSP" = x""], [
			AC_MSG_ERROR(
				[DEVKITPSP is not set! Please set DEVKITPSP.])
		])

		OBJCFLAGS="$OBJCFLAGS -G0"
		CPPFLAGS="$CPPFLAGS -I$DEVKITPSP/psp/sdk/include"
		LDFLAGS="$LDFLAGS -G0"
		LIBS="$LIBS -L$DEVKITPSP/psp/sdk/lib -lpspdebug -lpspdisplay"
		LIBS="$LIBS -lpspge -lpspctrl -lpspsdk -lc -lpspnet"
		LIBS="$LIBS -lpspnet_inet -lpspnet_apctl -lpspnet_resolver"
		LIBS="$LIBS -lpsputility -lpspuser -lpspkernel"
		enable_shared="no"
		enable_threads="no"	# TODO
		enable_sockets="no"	# TODO
		check_pedantic="no"

		AC_SUBST(MAP_LDFLAGS, ['-Wl,-Map,$@.map'])
		;;
esac

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

AC_ARG_WITH(wii,
	AS_HELP_STRING([--with-wii], [build for Wii]))
AS_IF([test x"$with_wii" = x"yes"], [
	AS_IF([test x"$DEVKITPRO" = x""], [
		AC_MSG_ERROR([DEVKITPRO is not set! Please set DEVKITPRO.])
	])

	OBJCFLAGS="$OBJCFLAGS -mrvl -mcpu=750 -meabi -mhard-float"
	CPPFLAGS="$CPPFLAGS -DGEKKO -I$DEVKITPRO/libogc/include"
	LDFLAGS="$LDFLAGS -mrvl -mcpu=750 -meabi -mhard-float"
	LIBS="$LIBS -L$DEVKITPRO/libogc/lib/wii -lfat -logc"
	TESTS_LIBS="$TESTS_LIBS -lwiiuse -lbte"
	enable_shared="no"
	enable_threads="no"	# TODO

	AC_SUBST(MAP_LDFLAGS, ['-Wl,-Map,$@.map'])
])

AC_ARG_WITH(nds,
	AS_HELP_STRING([--with-nds], [build for Nintendo DS]))
AS_IF([test x"$with_nds" = x"yes"], [
	AS_IF([test x"$DEVKITPRO" = x""], [
		AC_MSG_ERROR([DEVKITPRO is not set! Please set DEVKITPRO.])
	])

	OBJCFLAGS="$OBJCFLAGS -march=armv5te -mtune=arm946e-s"
	OBJCFLAGS="$OBJCFLAGS -mthumb -mthumb-interwork"
	CPPFLAGS="$CPPFLAGS -DARM9 -I$DEVKITPRO/libnds/include"
	LDFLAGS="$LDFLAGS -specs=ds_arm9.specs"
	LIBS="$LIBS -L$DEVKITPRO/libnds/lib -lfilesystem -lfat -lnds9"
	enable_shared="no"
	enable_threads="no"	# TODO
	enable_sockets="no"	# TODO
	check_pedantic="no"

	AC_DEFINE(OF_NINTENDO_DS, 1,
		[Whether we are compiling for the Nintendo DS])
	AC_SUBST(MAP_LDFLAGS, ['-Wl,-Map,$@.map'])
])

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

dnl Clang generates MIPS assembly not accepted by GNU as, however, Clang's
dnl integrated assembler doesn't accept everything used in ObjFW's assembly
dnl files. Therefore, use the integrated assembler for ObjC files, but not for
dnl assembly files.
case "$OBJC" in
	*clang*)
		case "$host_cpu" in
			mips*)
				OBJCFLAGS="$OBJCFLAGS -integrated-as"
				AC_SUBST(INTEGRATED_AS, "-integrated-as")
				;;
		esac
		;;
esac

AX_CHECK_COMPILER_FLAGS(-std=gnu11, [
	OBJCFLAGS="$OBJCFLAGS -std=gnu11"
], [
	AX_CHECK_COMPILER_FLAGS(-std=gnu1x, [
		OBJCFLAGS="$OBJCFLAGS -std=gnu1x"
	], [
		AX_CHECK_COMPILER_FLAGS(-std=gnu99,
			[OBJCFLAGS="$OBJCFLAGS -std=gnu99"])
	])
])

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="$OBJCFLAGS -fno-constant-cfstrings"
	AC_SUBST(NO_CONST_CFSTRINGS, "-fno-constant-cfstrings")
])
AX_CHECK_COMPILER_FLAGS(-Wshorten-64-to-32 -Werror,
	[OBJCFLAGS="$OBJCFLAGS -Wshorten-64-to-32"])
AX_CHECK_COMPILER_FLAGS(-Wsemicolon-before-method-body -Werror,
	[OBJCFLAGS="$OBJCFLAGS -Wsemicolon-before-method-body"])
AX_CHECK_COMPILER_FLAGS(-Wobjc-property-synthesis -Werror,
	[OBJCFLAGS="$OBJCFLAGS -Wobjc-property-synthesis"])

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 = [foo bar];
], [
	AC_SUBST(PROPERTIESTESTS_M, "PropertiesTests.m")
	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_SUBST(BLOCKS_FLAGS, "-fblocks")
	AC_SUBST(OFBLOCKTESTS_M, "OFBlockTests.m")
	AC_MSG_RESULT(yes)
], [
	AC_MSG_RESULT(no)
	OBJCFLAGS="$old_OBJCFLAGS"
])

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${LIB_SUFFIX}")
	AC_SUBST(EXCEPTIONS_LIB_A, "exceptions.lib.a")
	AC_SUBST(EXCEPTIONS_EXCEPTIONS_LIB_A, "exceptions/exceptions.lib.a")
	AC_SUBST(FORWARDING_LIB_A, "forwarding.lib.a")
	AC_SUBST(FORWARDING_FORWARDING_LIB_A, "forwarding/forwarding.lib.a")
	AC_SUBST(LOOKUP_ASM_LIB_A, "lookup-asm.lib.a")
	AC_SUBST(LOOKUP_ASM_LOOKUP_ASM_LIB_A, "lookup-asm/lookup-asm.lib.a")
], [
	AC_SUBST(LIBOBJFW_DEP, "../src/libobjfw.a")
	AC_SUBST(LIBOBJFW_DEP_LVL2, "../../src/libobjfw.a")
])
AC_ARG_ENABLE(static, AS_HELP_STRING([--enable-static], [build static library]))
AS_IF([test x"$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_SUBST(FORWARDING_A, "forwarding.a")
	AC_SUBST(FORWARDING_FORWARDING_A, "forwarding/forwarding.a")
	AC_SUBST(LOOKUP_ASM_A, "lookup-asm.a")
	AC_SUBST(LOOKUP_ASM_LOOKUP_ASM_A, "lookup-asm/lookup-asm.a")
])

AC_DEFINE_UNQUOTED(PLUGIN_SUFFIX, "$PLUGIN_SUFFIX", [Suffix for plugins])
AS_IF([test x"$PLUGIN_SUFFIX" != x""], [
	AC_SUBST(USE_SRCS_PLUGINS, '${SRCS_PLUGINS}')
	AC_SUBST(TESTPLUGIN, "plugin")
	AC_DEFINE(OF_HAVE_PLUGINS, 1, [Whether we have plugin support])
])

AC_MSG_CHECKING(whether we need -D_GNU_SOURCE)
AC_EGREP_CPP(yes, [
	#include <stdlib.h>

	#if defined(__GLIBC__) || defined(__MINGW32__)
	yes
	#endif
], [
	CPPFLAGS="-D_GNU_SOURCE $CPPFLAGS"
	AC_MSG_RESULT(yes)
], [
	AC_MSG_RESULT(no)
])

case "$host_os" in
	solaris*)
		CPPFLAGS="-D__EXTENSIONS__ -D_POSIX_PTHREAD_SEMANTICS $CPPFLAGS"
		;;
esac

objc_runtime="ObjFW runtime"
AC_CHECK_HEADER(objc/objc.h)
AC_MSG_CHECKING(which Objective C runtime to use)
AC_ARG_ENABLE(runtime,
	AS_HELP_STRING([--enable-runtime], [use the included runtime]))
AC_ARG_ENABLE(seluid24,
	AS_HELP_STRING([--enable-seluid24],
		[use 24 bit instead of 16 bit for selector UIDs]))
AS_IF([test x"$enable_runtime" != x"yes"], [
	AS_IF([test x"$ac_cv_header_objc_objc_h" = x"yes"], [
		AC_EGREP_CPP(yes, [
			#import <objc/objc.h>

			#ifdef OBJC_BOOL_DEFINED
			yes
			#endif
		], [
			objc_runtime="Apple runtime"
		], [
			dnl We don't want the GNU runtime
			:
		])
	])
])
AC_MSG_RESULT($objc_runtime)

case "$objc_runtime" in
	"ObjFW runtime")
		AC_DEFINE(OF_OBJFW_RUNTIME, 1,
			[Whether we use the ObjFW runtime])

		AC_MSG_CHECKING([whether -fobjc-runtime=objfw is supported])

		old_OBJCFLAGS="$OBJCFLAGS"
		OBJCFLAGS="$OBJCFLAGS -fobjc-runtime=objfw"
		AC_TRY_LINK([
			@interface Test
			+ (void)test;
			@end

			@implementation Test
			+ (void)test
			{
			}
			@end

			void*
			objc_msg_lookup(void *obj, void *sel)
			{
				return (void*)0;
			}

			void
			__objc_exec_class(void *module)
			{
			}
		], [
			[Test test];
		], [
			RUNTIME_FLAGS="-fobjc-runtime=objfw"
			AC_MSG_RESULT(yes)
		], [
			RUNTIME_FLAGS="-fgnu-runtime"
			OBJCFLAGS="$old_OBJCFLAGS -fgnu-runtime"
			AC_MSG_RESULT(no)
			old_compiler="yes"
		])

		AC_SUBST(RUNTIME, "runtime")
		AC_SUBST(RUNTIME_FLAGS)

		if test x"$enable_shared" != x"no"; then
			AC_SUBST(RUNTIME_LIB_A, "runtime.lib.a")
			AC_SUBST(RUNTIME_RUNTIME_LIB_A, "runtime/runtime.lib.a")
		fi
		if test x"$enable_static" = x"yes" \
		    -o x"$enable_shared" = x"no"; then
			AC_SUBST(RUNTIME_A, "runtime.a")
			AC_SUBST(RUNTIME_RUNTIME_A, "runtime/runtime.a")
		fi

		AS_IF([test x"$enable_seluid24" = x"yes"], [
			AC_DEFINE(OF_SELUID24, 1,
				[Whether to use 24 bit selector UIDs])
		])

		AC_MSG_CHECKING(for exception type)
		AC_TRY_COMPILE([
			extern void foo();
		], [
			@try {
				foo();
			} @finally {
				foo();
			}
		], [
			AS_IF([$EGREP __gnu_objc_personality_v0 \
					conftest.$ac_objext >/dev/null], [
				exception_type="DWARF"
			])
			AS_IF([$EGREP __gnu_objc_personality_sj0 \
					conftest.$ac_objext >/dev/null], [
				exception_type="SjLj"
			])
			AS_IF([$EGREP __gnu_objc_personality_seh0 \
					conftest.$ac_objext >/dev/null], [
				exception_type="SEH"
			])

			case "$exception_type" in
			DWARF)
				AC_DEFINE(HAVE_DWARF_EXCEPTIONS, 1,
					[Whether DWARF exceptions are used])
				;;
			SjLj)
				AC_DEFINE(HAVE_SJLJ_EXCEPTIONS, 1,
					[Whether SjLj exceptions are used])
				;;
			SEH)
				AC_DEFINE(HAVE_SEH_EXCEPTIONS, 1,
					[Whether SEH exceptions are used])
				;;
			*)
				AC_MSG_RESULT(unknown)
				AC_MSG_ERROR([Exception type not detected!])
				;;
			esac

			AC_MSG_RESULT($exception_type)
		], [
			AC_MSG_RESULT(exceptions unavailable!)
			AC_MSG_ERROR([Exceptions not accepted by compiler!])
		])
		;;
	"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!])
		])
		;;
esac

AC_CHECK_FUNC(objc_constructInstance, [], [
	AC_SUBST(INSTANCE_M, "instance.m")
])

AC_CHECK_FUNC(objc_autoreleasePoolPush, [], [
	AC_SUBST(AUTORELEASE_M, "autorelease.m")
])

AC_CHECK_FUNC(objc_enumerationMutation, [
	AC_DEFINE(HAVE_OBJC_ENUMERATIONMUTATION, 1,
		[Whether we have objc_enumerationMutation()])
])

case "$host_os" in
	darwin*)
		AC_SUBST(LDFLAGS_REEXPORT, ["-Wl,-reexport-lobjfw"])
		AS_IF([test x"$objc_runtime" = x"Apple runtime"], [
			AC_SUBST(REEXPORT_LIBOBJC, ["-Wl,-reexport-lobjc"])
		])
		;;
esac

AC_C_BIGENDIAN([
	AC_DEFINE(OF_BIG_ENDIAN, 1, [Whether we are big endian])
])
AS_IF([test x"$ac_cv_c_bigendian" = x"universal"], [
	AC_DEFINE(OF_UNIVERSAL, 1, [Whether we are building a universal binary])
])

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_MSG_CHECKING(for SSIZE_MAX)
AC_EGREP_CPP(yes, [
	#include <stdint.h>
	#include <limits.h>

	#ifdef SSIZE_MAX
	yes
	#endif
], [
	AC_MSG_RESULT(yes)
], [
	AC_MSG_RESULT(no)
	AC_DEFINE(SSIZE_MAX, [((ssize_t)(SIZE_MAX / 2))],
		[Maximum value for ssize_t])
])

AC_CHECK_TYPE(max_align_t,
	[AC_DEFINE(OF_HAVE_MAX_ALIGN_T, 1, [Whether we have max_align_t])])

AC_CHECK_HEADER(stdnoreturn.h,
	[AC_DEFINE(OF_HAVE_STDNORETURN_H, 1, [Whether we have stdnoreturn.h])])

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"
AS_IF([test x"$ac_cv_c_bigendian" != x"universal"], [
	AC_TRY_COMPILE([
		double endianess = 2.993700760838795055656993580068609688772747263874402942272934826871811872228512759832626847251963763755836687759498519784550143745834860002945223766052808125982053455555265216112722718870586961456110693379343178124592311441022662940307099598578775368547768968914916965731708568179631324904813506101190853720749196062963892799499230635163056742330563321122389331703618066046034494287335316842529021563862331183541255013987734473643350285400060357711238514186776429325214739886098119655678483017894951556639821088508565036657794343031121375178126860889964700274558728491825977274341798997758923017217660272136611938897932105874133412726223468780517578125e-259;
	], [
	], [
		AS_IF([$EGREP BigEnd conftest.$ac_objext >/dev/null], [
			AC_DEFINE(OF_FLOAT_BIG_ENDIAN, 1,
				[Whether floats are big endian])
			fp_endianess="big endian"
		], [
			AS_IF([$EGREP dnEgiB conftest.$ac_objext >/dev/null], [
				fp_endianess="little endian"
			])
		])
	])
], [
	fp_endianess="universal"
])
AC_MSG_RESULT($fp_endianess)
AS_IF([test x"$fp_endianess" = x"unknown"], [
	AC_MSG_ERROR(
		[Floating point implementation does not conform to IEEE 754!])])

case "$host_cpu" in
	arm*)
		AC_MSG_CHECKING(if VFP2 or above is available)
		AC_TRY_COMPILE([], [
			__asm__ __volatile__ (
			    "fstmfdd sp!, {d0-d7}"
			);
		], [
			AC_DEFINE(HAVE_VFP2, 1, [Whether we have VFP2 or above])
			AC_MSG_RESULT(yes)
		], [
			AC_MSG_RESULT(no)
		])
		;;
esac

AC_CHECK_FUNCS(strerror_r)

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

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

	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_FUNCS(sigaction)

AC_CHECK_FUNCS([arc4random random], break)

AC_CHECK_LIB(dl, dlopen, LIBS="$LIBS -ldl")
AC_CHECK_HEADERS_ONCE(dlfcn.h)
case "$host_os" in
	netbsd*)
		dnl dladdr exists on NetBSD, but it is completely broken.
		dnl When using it with code that uses __thread, it freezes the
		dnl process so that it has to be killed using SIGKILL.
		dnl When disabling __thread, it doesn't freeze, but all symbols
		dnl are wrong.
		;;
	*)
		AC_CHECK_FUNCS(dladdr)
		;;
esac

AC_ARG_ENABLE(threads,
	AS_HELP_STRING([--disable-threads], [disable thread support]))
AS_IF([test x"$enable_threads" != x"no"], [
	AC_MSG_CHECKING(for threads)

	case "$host_os" in
	mingw*)
		AC_MSG_RESULT(WinAPI)
		;;
	*)
		AC_MSG_RESULT(POSIX)

		AX_CHECK_COMPILER_FLAGS(-pthread, [
			CPPFLAGS="$CPPFLAGS -pthread"
		], [
			CPPFLAGS="$CPPFLAGS -D_REENTRANT -D_THREAD_SAFE"
		])

		AC_CHECK_LIB(pthread, pthread_create, LIBS="$LIBS -lpthread")

		AC_TRY_LINK([
			#include <pthread.h>
		], [
			pthread_create(NULL, NULL, NULL, NULL);
		], [], [
			AC_MSG_ERROR(No supported threads found!)
		])

		AC_DEFINE(OF_HAVE_PTHREADS, 1, [Whether we have pthreads])

		AC_TRY_COMPILE([
			#include <pthread.h>
		], [
			pthread_mutexattr_t attr;
			pthread_mutexattr_settype(&attr,
			    PTHREAD_MUTEX_RECURSIVE);
		], [
			AC_DEFINE(OF_HAVE_RECURSIVE_PTHREAD_MUTEXES, 1,
				[If pthread mutexes can be recursive])
		])

		AC_CHECK_FUNC(pthread_spin_lock, [
			have_spinlocks="yes"
			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_CHECK_FUNCS(pthread_attr_setinheritsched)

		AC_CHECK_HEADERS(pthread_np.h, [], [], [#include <pthread.h>])
		AC_CHECK_FUNCS(pthread_set_name_np pthread_setname_np, break)
		;;
	esac

	AC_DEFINE(OF_HAVE_THREADS, 1, [Whether we have threads])
	AC_SUBST(USE_SRCS_THREADS, '${SRCS_THREADS}')

	AC_ARG_ENABLE(compiler-tls,
		AS_HELP_STRING([--disable-compiler-tls],
			[disable compiler thread local storage]))

	case "$host" in
		aarch64*-*-android*)
			# Compiler TLS is broken on AArch64 Android with Clang
			enable_compiler_tls="no"
			;;
	esac

	AS_IF([test x"$enable_compiler_tls" != x"no"], [
		AC_CHECK_HEADER(threads.h, [
			AC_DEFINE(OF_HAVE_THREADS_H, 1,
				[Whether we have threads.h])
		])

		AC_MSG_CHECKING(whether _Thread_local works)
		AC_TRY_LINK([
			static _Thread_local int x = 0;
		], [
			x++;
		], [
			AS_IF([test x"$enable_shared" != x"no"], [
				old_OBJCFLAGS="$OBJCFLAGS"
				OBJCFLAGS="$OBJCFLAGS -fPIC"
				AC_TRY_COMPILE([
					static _Thread_local int x = 0;
				], [
					x++;
				], [
					AC_MSG_RESULT(yes)
					AC_DEFINE(OF_HAVE__THREAD_LOCAL, 1,
						[Whether _Thread_local works])
				], [
					AC_MSG_RESULT(no)
				])
				OBJCFLAGS="$old_OBJCFLAGS"
			], [
				AC_MSG_RESULT(yes)
				AC_DEFINE(OF_HAVE__THREAD_LOCAL, 1,
					[Whether _Thread_local works])
			])
		], [
			AC_MSG_RESULT(no)

			AC_MSG_CHECKING(whether __thread works)
			AC_TRY_LINK([
				/* It seems __thread is buggy with GCC 4.1 */
				#if __GNUC__ == 4 && __GNUC_MINOR__ < 2
				# error buggy
				#endif

				__thread int x = 0;
			], [
				x++;
			], [
				AS_IF([test x"$enable_shared" != x"no"], [
					old_OBJCFLAGS="$OBJCFLAGS"
					OBJCFLAGS="$OBJCFLAGS -fPIC"
					AC_TRY_COMPILE([
						__thread int x = 0;
					], [
						x++;
					], [
						AC_MSG_RESULT(yes)
						AC_DEFINE(OF_HAVE___THREAD, 1,
							[Whether __thread works]
						)
					], [
						AC_MSG_RESULT(no)
					])
					OBJCFLAGS="$old_OBJCFLAGS"
				], [
					AC_MSG_RESULT(yes)
					AC_DEFINE(OF_HAVE___THREAD, 1,
						[Whether __thread works])
				])
			], [
				AC_MSG_RESULT(no)
			])
		])
	])

	atomic_ops="none"

	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)
		atomic_ops="GCC builtins"
		AC_DEFINE(OF_HAVE_GCC_ATOMIC_OPS, 1,
			[Whether GCC atomic operations are available])
	], [
		AC_MSG_RESULT(no)
	])

	AC_MSG_CHECKING(whether we have an atomic ops assembly implementation)
	AC_EGREP_CPP(yes, [
		#if defined(__GNUC__) && (defined(__i386__) || \
			defined(__x86_64__) || defined(__amd64__)) || \
			defined(__ppc__)
		yes
		#endif
	], [
		AC_MSG_RESULT(yes)
		test x"$atomic_ops" = x"none" && \
			atomic_ops="assembly implementation"
	], [
		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])
	])
], [
	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"$atomic_ops" != x"none"], [
	AC_DEFINE(OF_HAVE_ATOMIC_OPS, 1, [Whether we have atomic operations])
	AC_SUBST(ATOMIC_H, "atomic.h")
])
AC_MSG_RESULT($atomic_ops)

AC_ARG_ENABLE(files,
	AS_HELP_STRING([--disable-files], [disable file support]))
AS_IF([test x"$enable_files" != x"no"], [
	AC_DEFINE(OF_HAVE_FILES, 1, [Whether we have files])
	AC_SUBST(USE_SRCS_FILES, '${SRCS_FILES}')
	AC_SUBST(OFHASH, "ofhash")
	AC_SUBST(OFZIP, "ofzip")

	AC_CHECK_TYPE(off64_t, [
		AC_DEFINE(OF_HAVE_OFF64_T, 1, [Whether we have off64_t])
	])

	AC_CHECK_HEADERS([pwd.h grp.h])
	AC_CHECK_FUNC(chmod, [
		AC_DEFINE(OF_HAVE_CHMOD, 1, [Whether we have chmod()])
	])
	AC_CHECK_FUNC(chown, [
		AC_DEFINE(OF_HAVE_CHOWN, 1, [Whether we have chown()])
	])
	AC_CHECK_FUNC(link, [
		AC_DEFINE(OF_HAVE_LINK, 1, [Whether we have link()])
	])
	AC_CHECK_FUNC(symlink, [
		AC_DEFINE(OF_HAVE_SYMLINK, 1, [Whether we have symlink()])
	])
	AC_CHECK_FUNCS([lstat readdir_r])
])

AC_CHECK_FUNCS([sysconf gmtime_r localtime_r nanosleep fcntl])

AC_CHECK_FUNC(pipe, [
	AC_DEFINE(OF_HAVE_PIPE, 1, [Whether we have pipe()])
])

AC_ARG_ENABLE(sockets,
	AS_HELP_STRING([--disable-sockets], [disable socket support]))
AS_IF([test x"$enable_sockets" != x"no"], [
	AC_DEFINE(OF_HAVE_SOCKETS, 1, [Whether we have sockets])
	AC_SUBST(USE_SRCS_SOCKETS, '${SRCS_SOCKETS}')

	AS_IF([test x"$enable_files" != x"no"], [
		AC_SUBST(OFHTTP, "ofhttp")
	])

	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_HEADER(sys/socket.h, [
		AC_DEFINE(OF_HAVE_SYS_SOCKET_H, 1,
			[Whether we have sys/socket.h])
	])
	AC_CHECK_HEADER(netinet/in.h, [
		AC_DEFINE(OF_HAVE_NETINET_IN_H, 1,
			[Whether we have netinet/in.h])
	])
	AC_CHECK_HEADER(netinet/tcp.h, [
		AC_DEFINE(OF_HAVE_NETINET_TCP_H, 1,
			[Whether we have netinet/tcp.h])
	])
	AC_CHECK_HEADERS([arpa/inet.h netdb.h])

	AC_CHECK_FUNCS([paccept accept4])

	AC_CHECK_FUNC(kqueue, [
		AC_DEFINE(HAVE_KQUEUE, 1, [Whether we have kqueue])
		AC_SUBST(OFKERNELEVENTOBSERVER_KQUEUE_M,
			"OFKernelEventObserver_kqueue.m")

		AC_CHECK_FUNCS(kqueue1)
	])
	AC_CHECK_FUNC(epoll_create, [
		AC_DEFINE(HAVE_EPOLL, 1, [Whether we have epoll])
		AC_SUBST(OFKERNELEVENTOBSERVER_EPOLL_M,
			"OFKernelEventObserver_epoll.m")

		AC_CHECK_FUNCS(epoll_create1)
	])
	AC_CHECK_HEADER(poll.h, [
		AC_DEFINE(HAVE_POLL_H, 1, [Whether we have poll.h])
		AC_SUBST(OFKERNELEVENTOBSERVER_POLL_M,
			"OFKernelEventObserver_poll.m")
	])
	AC_CHECK_HEADER(sys/select.h, [
		AC_DEFINE(HAVE_SYS_SELECT_H, 1, [Whether we have sys/select.h])
		AC_SUBST(OFKERNELEVENTOBSERVER_SELECT_M,
			"OFKernelEventObserver_select.m")
	])

	case "$host_os" in
		mingw*)
			AC_SUBST(OFKERNELEVENTOBSERVER_SELECT_M,
				"OFKernelEventObserver_select.m")
			;;
	esac

	AS_IF([test x"$with_wii" = x"yes"], [
	       AC_SUBST(OFKERNELEVENTOBSERVER_POLL_M,
			"OFKernelEventObserver_poll.m")
	])

	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
		typedef unsigned char BOOL;
		# 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)
	])
])

AS_IF([test x"$enable_sockets" != x"no" -a x"$enable_threads" != x"no"], [
	AC_SUBST(OFHTTPCLIENTTESTS_M, "OFHTTPClientTests.m")
])

AC_DEFUN([CHECK_BUILTIN_BSWAP], [
	AC_MSG_CHECKING(for __builtin_bswap$1)
	AC_TRY_LINK([
		#include <stdint.h>
		#include <stdio.h>
		#include <inttypes.h>
		#include <errno.h>
	], [
		uint$1_t i = errno;
		printf("%" PRIu$1, __builtin_bswap$1(i));
	], [
		AC_MSG_RESULT(yes)
		AC_DEFINE(OF_HAVE_BUILTIN_BSWAP$1, 1,
			[Whether we have __builtin_bswap$1])
	], [
		AC_MSG_RESULT(no)
	])
])
CHECK_BUILTIN_BSWAP(16)
CHECK_BUILTIN_BSWAP(32)
CHECK_BUILTIN_BSWAP(64)

case "$host" in
	arm*-apple-darwin*)
		have_processes="no"
		;;
	*-*-mingw*)
		have_processes="yes"
		;;
	*-*-msdosdjgpp*)
		have_processes="no"
		;;
	*)
		AC_CHECK_FUNCS(kill)

		AC_CHECK_FUNCS(posix_spawnp, [
			AS_IF([test x"$ac_cv_func_kill" = x"yes"], [
				have_processes="yes"

				AC_CHECK_HEADERS(spawn.h)
			])
		], [
			AC_CHECK_FUNCS([vfork dup2 execvp _exit], [
				AS_IF([test x"$ac_cv_func_vfork" = x"yes" \
				    -a x"$ac_cv_func_pipe" = x"yes" \
				    -a x"$ac_cv_func_dup2" = x"yes" \
				    -a x"$ac_cv_func_execvp" = x"yes" \
				    -a x"$ac_cv_func_kill" = x"yes" \
				    -a x"$ac_cv_func__exit" = x"yes"], [
					have_processes="yes"
				])
			], [
				break
			])
		])
		;;
esac
AS_IF([test x"$have_processes" = x"yes"], [
	AC_SUBST(OFPROCESS_M, "OFProcess.m")
	AC_DEFINE(OF_HAVE_PROCESSES, 1, [Whether we have processes])
])

AC_CHECK_HEADERS_ONCE([sys/ioctl.h sys/termios.h])

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

		AS_IF([test x"$enable_shared" != x"no"], [
			AC_SUBST(OBJFW_BRIDGE_SHARED_LIB,
				"${LIB_PREFIX}objfw-bridge${LIB_SUFFIX}")
		])
		AS_IF([test x"$enable_static" = x"yes" \
		    -o x"$enable_shared" = x"no"], [
			AC_SUBST(OBJFW_BRIDGE_STATIC_LIB, "libobjfw-bridge.a")
		])
	])
])

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

	AC_MSG_CHECKING(whether we have GCC 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([
		#ifdef __has_attribute
		# if __has_attribute(objc_root_class)
		__attribute__((__objc_root_class__))
		# endif
		#endif
		@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"
	])

	old_OBJCFLAGS="$OBJCFLAGS"
	OBJCFLAGS="$OBJCFLAGS -Wdocumentation"
	AC_MSG_CHECKING(whether -Wdocumentation works correctly)
	AC_TRY_COMPILE([
		/*!
		 * @class Test conftest.m conftest.m
		 */
		@interface Test
		@end
	], [
	], [
		AC_MSG_RESULT(yes)
	], [
		AC_MSG_RESULT(no)
		OBJCFLAGS="$old_OBJCFLAGS"
	])

	AS_IF([test x"$check_pedantic" = x"yes"], [
		old_OBJCFLAGS="$OBJCFLAGS"
		OBJCFLAGS="$OBJCFLAGS -pedantic"
		AC_MSG_CHECKING(whether -pedantic is buggy)
		AC_TRY_COMPILE([
			#import <stdlib.h>

			#ifdef __has_attribute
			# if __has_attribute(objc_root_class)
			__attribute__((__objc_root_class__))
			# endif
			#endif
			@interface Foo
			{
				void *foo;
			}
			@end

			@interface Bar: Foo
			@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_alias}-")

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

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

	AS_IF([test x"$with_wii" = x"yes"], [
		dnl Keep this lowercase, as WIILOAD is a variable used by
		dnl wiiload and thus likely already set by the user to something
		dnl that is not the path of the wiiload binary.
		AC_CHECK_PROG(wiiload, wiiload, wiiload)

		AS_IF([test x"$wiiload" != x""], [
			AC_SUBST(RUN_TESTS, "run")
			AC_SUBST(TEST_LAUNCHER, "$wiiload")
		])
	])
], [
	AC_SUBST(RUN_TESTS, "run")
])

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)
dnl We use the ObjC compiler as our assembler
AC_SUBST(AS, $OBJC)
AC_SUBST(ASFLAGS)
AC_SUBST(AS_DEPENDS, '${OBJC_DEPENDS}')

AC_SUBST(TESTS_LIBS)

AC_CONFIG_FILES([
	buildsys.mk
	extra.mk
	misc/Bridge-Info.plist
	misc/Info.plist
	utils/objfw-config
])
AC_CONFIG_HEADERS([config.h src/objfw-defs.h])
AC_OUTPUT

AS_IF([test x"$old_compiler" = x"yes"], [
	echo
	printf "  ** Note: Your compiler does not seem to "
	echo "accept -fobjc-runtime=objfw."
	printf "  ** To get optimal performance, you should install "
	echo "Clang >= 3.2"
	printf "  ** (or the latest Clang release to be able to use all "
	echo "features)."
	echo
])

AS_IF([test x"$enable_threads" != x"no" -a x"$atomic_ops" = x"none" \
    -a x"$have_spinlocks" != x"yes"], [
	echo
	printf "  ** Warning: You have enabled threads, but neither atomic "
	echo "operations nor"
	printf "  ** spinlocks are available. Expect *very* poor performance, "
	echo "as a mutex will"
	printf "  ** be locked for every retain and release! If you don't "
	echo "need threads, try"
	echo "  ** --disable-threads to work around this problem."
	echo
])