ObjFW  Diff

		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="$OBJCFLAGS -fno-constant-cfstrings"
	AC_SUBST(NO_CONST_CFSTRINGS, "-fno-constant-cfstrings")
AX_CHECK_COMPILER_FLAGS(-Xclang -fno-constant-cfstrings, [
	OBJCFLAGS="$OBJCFLAGS -Xclang -fno-constant-cfstrings"
	AC_SUBST(NO_CONST_CFSTRINGS, "-Xclang -fno-constant-cfstrings")
])
AX_CHECK_COMPILER_FLAGS([-Wsign-compare -Werror],
	[OBJCFLAGS="$OBJCFLAGS -Wsign-compare"])
AS_IF([test x"$with_nds" != x"yes"], [
	AX_CHECK_COMPILER_FLAGS([-Wshadow -Werror],
		[OBJCFLAGS="$OBJCFLAGS -Wshadow"])
])

	"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"
		OBJCFLAGS="$OBJCFLAGS -Xclang -fobjc-runtime=objfw"
		AC_TRY_LINK([
			#ifdef __has_attribute
			# if __has_attribute(objc_root_class)
			__attribute__((__objc_root_class__))
			# endif
			#endif
			@interface Test

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

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

		dnl Use -Wp, as we only use it for the preprocessor.
		AX_CHECK_COMPILER_FLAGS(-pthread, [
			CPPFLAGS="$CPPFLAGS -pthread"
		AX_CHECK_COMPILER_FLAGS(-Wp,-pthread, [
			CPPFLAGS="$CPPFLAGS -Wp,-pthread"
		], [
			CPPFLAGS="$CPPFLAGS -D_REENTRANT -D_THREAD_SAFE"
		])

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

		AC_TRY_LINK([

])

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 -fblocks"
OBJCFLAGS="$OBJCFLAGS -Xclang -fblocks"
AC_TRY_COMPILE([], [
	int (^foo)(int bar);
	foo = ^ (int bar) { return 0; }
], [
	AC_SUBST(BLOCKS_FLAGS, "-fblocks")
	AC_SUBST(BLOCKS_FLAGS, "-Xclang -fblocks")
	AC_SUBST(OFBLOCKTESTS_M, "OFBlockTests.m")
	AC_MSG_RESULT(yes)
], [
	AC_MSG_RESULT(no)
	OBJCFLAGS="$old_OBJCFLAGS"
])