ObjFW  Check-in [28eda87705]

		dnl The inline headers generate code that triggers
		dnl -Wpointer-sign.
		OBJCFLAGS="$OBJCFLAGS -Wno-pointer-sign"
		;;
esac

AC_MSG_CHECKING(whether Objective C compiler supports properties)
AC_COMPILE_IFELSE([
	AC_LANG_PROGRAM([
		#ifdef __has_attribute
		# if __has_attribute(objc_root_class)
		__attribute__((__objc_root_class__))
		# endif
		#endif
		@interface Foo
		{
			id bar;
		}

		@property (nonatomic, retain) id bar;
		@end
	], [[
		Foo *foo = (id)0;
		[foo setBar: (id)0];
		foo = [foo bar];
	]])
], [
	AC_MSG_RESULT(yes)
], [
	AC_MSG_RESULT(no)
	AC_MSG_ERROR(Compiler does not support properties!)
])

		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 -Xclang -fobjc-runtime=objfw"
		AC_LINK_IFELSE([
			AC_LANG_PROGRAM([
				#ifdef __has_attribute
				# if __has_attribute(objc_root_class)
				__attribute__((__objc_root_class__))
				# endif
				#endif
				@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];
			]])
		], [
			flag="-Xclang -fobjc-runtime=objfw"
			OBJFW_OBJCFLAGS="$OBJFW_OBJCFLAGS $flag"
			AC_MSG_RESULT(yes)
		], [
			flag="-fgnu-runtime"
			OBJCFLAGS="$old_OBJCFLAGS $flag"

		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_COMPILE_IFELSE([
			AC_LANG_PROGRAM([
				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], [

		])
		;;
esac

AC_MSG_CHECKING(whether Objective C compiler supports ARC)
old_OBJCFLAGS="$OBJCFLAGS"
OBJCFLAGS="$OBJCFLAGS -fobjc-arc -fobjc-arc-exceptions"
AC_COMPILE_IFELSE([
	AC_LANG_PROGRAM([
		#ifdef __has_attribute
		# if __has_attribute(objc_root_class)
		__attribute__((__objc_root_class__))
		# endif
		#endif
		@interface Foo
		{
			struct objc_class *_isa;
		}

		+ (id)alloc;
		@end

		@implementation Foo
		+ (id)alloc
		{
			return (id)0;
		}
		@end
	], [[
		__weak id foo = [Foo alloc];
		(void)foo;
	]])
], [
	AC_MSG_RESULT(yes)
	AC_DEFINE(COMPILER_SUPPORTS_ARC, 1, [Whether the compiler supports ARC])
	AC_SUBST(RUNTIME_ARC_TESTS_M, RuntimeARCTests.m)
], [
	AC_MSG_RESULT(no)
])

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"$ac_cv_c_bigendian" != x"universal"], [
	AC_COMPILE_IFELSE([
		AC_LANG_SOURCE([
			double endianess = 2.993700760838795055656993580068609688772747263874402942272934826871811872228512759832626847251963763755836687759498519784550143745834860002945223766052808125982053455555265216112722718870586961456110693379343178124592311441022662940307099598578775368547768968914916965731708568179631324904813506101190853720749196062963892799499230635163056742330563321122389331703618066046034494287335316842529021563862331183541255013987734473643350285400060357711238514186776429325214739886098119655678483017894951556639821088508565036657794343031121375178126860889964700274558728491825977274341798997758923017217660272136611938897932105874133412726223468780517578125e-259;
		])
	], [
		AS_IF([$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!])])

AC_MSG_CHECKING(for INFINITY)
AC_COMPILE_IFELSE([
	AC_LANG_PROGRAM([
		#include <stdio.h>
		#include <math.h>
	], [
		printf("%f", INFINITY);
	])
], [
	AC_MSG_RESULT(yes)
], [
	AC_MSG_RESULT(no)

	AC_MSG_CHECKING(for __builtin_inf)
	AC_COMPILE_IFELSE([
		AC_LANG_PROGRAM([
			#include <stdio.h>
		], [
			printf("%f", __builtin_inf());
		])
	], [
		AC_MSG_RESULT(yes)
		AC_DEFINE(INFINITY, [(__builtin_inf())],
			[Workaround for missing INFINITY])
	], [
		AC_MSG_RESULT(no)

		AC_MSG_ERROR([Neither INFINITY or __builtin_inf was found!])
	])
])

case "$host_cpu" in
	arm* | earm*)
		AC_MSG_CHECKING(for VFP2 or above)
		AC_COMPILE_IFELSE([
			AC_LANG_PROGRAM([], [
				#if !defined(__arm64__) && \
				    !defined(__aarch64__) && \
				    !defined(__ARM64_ARCH_8__)
				__asm__ __volatile__ (
				    "vstmdb	sp!, {d0-d7}"
				);
				#endif
			])
		], [
			AC_DEFINE(HAVE_VFP2, 1, [Whether we have VFP2 or above])
			AC_MSG_RESULT(yes)
		], [
			AC_MSG_RESULT(no)
		])
		;;

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

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

		AC_LINK_IFELSE([
			AC_LANG_PROGRAM([
				#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_COMPILE_IFELSE([
			AC_LANG_PROGRAM([
				#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"

	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_LINK_IFELSE([
			AC_LANG_PROGRAM([
				static _Thread_local int x = 0;
			], [
				x++;
			])
		], [
			AS_IF([test x"$enable_shared" != x"no"], [
				old_OBJCFLAGS="$OBJCFLAGS"
				OBJCFLAGS="$OBJCFLAGS -fPIC"
				AC_COMPILE_IFELSE([
					AC_LANG_PROGRAM([
						static _Thread_local int x = 0;
					], [
						x++;
					])
				], [
					AC_MSG_RESULT(yes)
					AC_DEFINE(OF_HAVE__THREAD_LOCAL, 1,
						[Whether _Thread_local works])
					have_thread_local="yes"
				], [
					AC_MSG_RESULT(no)

			])
		], [
			AC_MSG_RESULT(no)
		])

		AS_IF([test x"$have_thread_local" != x"yes"], [
			AC_MSG_CHECKING(whether __thread works)
			AC_LINK_IFELSE([
				AC_LANG_PROGRAM([
					/*
					 * 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_COMPILE_IFELSE([
						AC_LANG_PROGRAM([
							__thread int x = 0;
						], [
							x++;
						])
					], [
						AC_MSG_RESULT(yes)
						AC_DEFINE(OF_HAVE___THREAD, 1,
							[Whether __thread works]
						)
					], [
						AC_MSG_RESULT(no)

		AC_MSG_RESULT(yes)
		atomic_ops="assembly implementation"
	], [
		AC_MSG_RESULT(no)
	])

	AC_MSG_CHECKING(whether __atomic_* works)
	AC_LINK_IFELSE([
		AC_LANG_PROGRAM([
			#include <stdbool.h>
			#include <stdint.h>
		], [
			int32_t i, j;
			if (__atomic_add_fetch(&i, 1, __ATOMIC_RELAXED))
				j = __atomic_sub_fetch(&i, 1, __ATOMIC_RELAXED);
			while (!__atomic_compare_exchange_n(&i, &j, 1, false,
			    __ATOMIC_RELAXED, __ATOMIC_RELAXED));
			__atomic_thread_fence(__ATOMIC_SEQ_CST);
		])
	], [
		AC_MSG_RESULT(yes)
		test x"$atomic_ops" = x"none" && \
			atomic_ops="__atomic_* builtins"
		AC_DEFINE(OF_HAVE_ATOMIC_BUILTINS, 1,
			[Whether __atomic_* builtins are available])
	], [
		AC_MSG_RESULT(no)
	])

	AC_MSG_CHECKING(whether __sync_* works)
	AC_LINK_IFELSE([
		AC_LANG_PROGRAM([
			#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="__sync_* builtins"
		AC_DEFINE(OF_HAVE_SYNC_BUILTINS, 1,
			[Whether __sync_* builtins are available])
	], [

	AC_CHECK_MEMBERS([struct stat.st_birthtime], [], [], [
		#include <sys/stat.h>
	])

	old_OBJCFLAGS="$OBJCFLAGS"
	OBJCFLAGS="$OBJCFLAGS -Werror"
	AC_MSG_CHECKING(for readdir_r)
	AC_COMPILE_IFELSE([
		AC_LANG_PROGRAM([
			#include <dirent.h>
		], [
			DIR *dir = 0;
			struct dirent entry, *result;

			readdir_r(dir, &entry, &result);
		])
	], [
		AC_MSG_RESULT(yes)
		AC_DEFINE(HAVE_READDIR_R, 1, [Whether we have readdir_r()])
	], [
		AC_MSG_RESULT(no)
	])
	OBJCFLAGS="$old_OBJCFLAGS"
])

AC_CHECK_HEADERS(fcntl.h dirent.h)
AC_CHECK_FUNCS([sysconf gmtime_r localtime_r nanosleep fcntl])

AC_CHECK_HEADERS(xlocale.h)
AC_CHECK_FUNCS([strtod_l strtof_l asprintf_l])
AS_IF([test x"$gnu_source" != x"yes" -a \( \
    x"$ac_cv_func_strtod_l" = x"yes" -o x"$ac_cv_func_strtof_l" = x"yes" -o \
    x"$ac_cv_func_asprintf_l" = x"yes" \)], [
	AC_MSG_CHECKING(whether *_l functions need _GNU_SOURCE)
	AC_COMPILE_IFELSE([
		AC_LANG_PROGRAM([
			#include <stdlib.h>
			#include <stdio.h>

			#include <locale.h>
			#ifdef HAVE_XLOCALE_H
			# include <xlocale.h>
			#endif
		], [
			#ifdef HAVE_STRTOD_L
			(void)strtod_l;
			#endif
			#ifdef HAVE_STRTOF_L
			(void)strtof_l;
			#endif
			#ifdef HAVE_ASPRINTF_L
			(void)asprintf_l;
			#endif
		])
	], [
		AC_MSG_RESULT(no)
	], [
		AC_MSG_RESULT(yes)
		CPPFLAGS="-D_GNU_SOURCE $CPPFLAGS"
	])
])

dnl This check needs to happen after the above, as _GNU_SOURCE can change the
dnl return type.
AC_CHECK_FUNCS(strerror_r, [
	AC_MSG_CHECKING(for return type of strerror_r)
	AC_COMPILE_IFELSE([
		AC_LANG_PROGRAM([
			#include <stdio.h>
			#include <string.h>
		], [
			switch (strerror_r(0, NULL, 0)) {
			case 0:;
			}
		])
	], [
		AC_MSG_RESULT(int)
	], [
		AC_MSG_RESULT(char *)
		AC_DEFINE(STRERROR_R_RETURNS_CHARP, 1,
			[Whether strerror_r returns char *])
	])

		AC_SUBST(OFHTTP, "ofhttp")
	])
	AC_SUBST(OFSOCK, "ofsock")
])

AC_DEFUN([CHECK_BUILTIN_BSWAP], [
	AC_MSG_CHECKING(for __builtin_bswap$1)
	AC_LINK_IFELSE([
		AC_LANG_PROGRAM([
			#include <stdint.h>
			#include <stdio.h>
			#include <errno.h>
		], [
			uint$1_t i = errno;
			printf("%d", (int)__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)
	])

dnl This needs to be after all other header checks, as they include unistd.h,
dnl which in old glibc versions uses __block. This is worked around in the code
dnl by providing a wrapper for unistd.h which takes care of this.
AC_MSG_CHECKING(whether Objective C compiler supports blocks)
old_OBJCFLAGS="$OBJCFLAGS"
OBJCFLAGS="$OBJCFLAGS -Xclang -fblocks"
AC_COMPILE_IFELSE([
	AC_LANG_PROGRAM([], [
		int (^foo)(int bar);
		foo = ^ (int bar) { return 0; }
	])
], [
	OBJFW_OBJCFLAGS="$OBJFW_OBJCFLAGS -Xclang -fblocks"
	AC_SUBST(OF_BLOCK_TESTS_M, "OFBlockTests.m")
	AC_MSG_RESULT(yes)
], [
	AC_MSG_RESULT(no)
	OBJCFLAGS="$old_OBJCFLAGS"
])

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

	AC_MSG_CHECKING(whether we need -Wno-strict-aliasing due to GCC bugs)
	AC_COMPILE_IFELSE([
		AC_LANG_PROGRAM([
			#ifdef __has_attribute
			# if __has_attribute(objc_root_class)
			__attribute__((__objc_root_class__))
			# endif
			#endif
			@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"
	])

	AC_MSG_CHECKING(
	    whether we need -Wno-unused-property-ivar due to Clang bugs)
	AC_COMPILE_IFELSE([
		AC_LANG_SOURCE([
			#ifdef __has_attribute
			# if __has_attribute(objc_root_class)
			__attribute__((__objc_root_class__))
			# endif
			#endif
			@interface Foo
			{
				struct objc_class *_isa;
				Foo *_foo;
			}

			@property (readonly, nonatomic) Foo *foo;

			+ (Foo *)foo;
			@end

			@implementation Foo
			@synthesize foo = _foo;

			+ (Foo *)foo
			{
				return (Foo *)0;
			}
			@end
		])
	], [
		AC_MSG_RESULT(no)
	], [
		AC_MSG_RESULT(yes)
		OBJCFLAGS="$OBJCFLAGS -Wno-unused-property-ivar"
	])

	old_OBJCFLAGS="$OBJCFLAGS"
	OBJCFLAGS="$OBJCFLAGS -Wcast-align"
	AC_MSG_CHECKING(whether -Wcast-align is buggy)
	AC_COMPILE_IFELSE([
		AC_LANG_SOURCE([
			#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 -Wunreachable-code"
	AC_MSG_CHECKING(whether -Wunreachable-code can be used)
	AC_COMPILE_IFELSE([
		AC_LANG_SOURCE([[
			#include <stdlib.h>
	
			typedef void *SEL;
	
			#ifdef __has_attribute
			# if __has_attribute(objc_root_class)
			__attribute__((__objc_root_class__))
			# endif
			#endif
			@interface Object
			- (void)doesNotRecognizeSelector: (SEL)selector
			#ifdef __clang__
			    __attribute__((__noreturn__))
			#endif
			    ;
			- (void)dealloc;
			@end
	
			@interface Foo: Object
			@end
	
			void
			test(void)
			{
				if (sizeof(int) == 4)
					__asm__ ("");
				else if (sizeof(int) == 8)
					__asm__ ("");
				else
					abort();
			}
	
			/*
			 * Unfortunately, this cannot be shorter, as it only
			 * works when it is used inside a macro.
			 */
			#ifdef __clang__
			# define OF_DEALLOC_UNSUPPORTED			\
				[self doesNotRecognizeSelector: _cmd];	\
									\
				abort();				\
									\
				_Pragma("clang diagnostic push ignore	\
				    \"-Wunreachable-code\"");		\
				[super dealloc];			\
				_Pragma("clang diagnostic pop");
			#else
			# define OF_DEALLOC_UNSUPPORTED			\
				[self doesNotRecognizeSelector: _cmd];	\
									\
				abort();				\
									\
				[super dealloc];
			#endif
	
			@implementation Foo
			- (void)dealloc
			{
				OF_DEALLOC_UNSUPPORTED
			}
			@end
		]])
	], [
		AC_MSG_RESULT(yes)
	], [
		AC_MSG_RESULT(no)
		OBJCFLAGS="$old_OBJCFLAGS"
	])

	old_OBJCFLAGS="$OBJCFLAGS"
	OBJCFLAGS="$OBJCFLAGS -Wdocumentation"
	AC_MSG_CHECKING(whether -Wdocumentation works correctly)
	AC_COMPILE_IFELSE([
		AC_LANG_SOURCE([
			/**
			 * @class Test conftest.m conftest.m
			 */
			#ifdef __has_attribute
			# if __has_attribute(objc_root_class)
			__attribute__((__objc_root_class__))
			# endif
			#endif
			@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_COMPILE_IFELSE([
			AC_LANG_SOURCE([
				#include <stdlib.h>

				#include <assert.h>

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

				@interface Bar: Foo
				- (void)assert;
				@end

				@implementation Bar
				- (void)assert
				{
					/*
					 * Some versions of glibc break with
					 * -pedantic when using assert.
					 */
					assert(1);
				}
				@end
			])
		], [
			AC_MSG_RESULT(no)
		], [
			AC_MSG_RESULT(yes)
			OBJCFLAGS="$old_OBJCFLAGS"
		])
	])

	AS_IF([test x"$ac_cv_header_complex_h" = x"yes"], [
		AC_MSG_CHECKING(whether we need -Wno-gnu-imaginary-constant)
		AC_COMPILE_IFELSE([
			AC_LANG_PROGRAM([
				#include <complex.h>
			], [
				complex float f = 0.5 + 0.5 * I;
				(void)f;
			])
		], [
			AC_MSG_RESULT(no)
		], [
			AC_MSG_RESULT(yes)
			OBJCFLAGS="$OBJCFLAGS -Wno-gnu-imaginary-constant"
		])
	])