ObjFW  Diff

	AC_ARG_ENABLE(werror,
		AS_HELP_STRING([--disable-werror], [do not build with -Werror]))
	AS_IF([test x"$enable_werror" = x"yes"], [
		OBJCFLAGS="$OBJCFLAGS -Werror"
	])

	old_OBJCFLAGS="$OBJCFLAGS"
	OBJCFLAGS="$OBJCFLAGS -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

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

	old_OBJCFLAGS="$OBJCFLAGS"
	OBJCFLAGS="$OBJCFLAGS -Werror"
	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__))

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

	old_OBJCFLAGS="$OBJCFLAGS"
	OBJCFLAGS="$OBJCFLAGS -Wcast-align -Werror"
	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

				struct objc_class *c = _isa;
				(void)c;
			}
			@end
		])
	], [
		AC_MSG_RESULT(no)
		OBJCFLAGS="$old_OBJCFLAGS -Wcast-align"
	], [
		AC_MSG_RESULT(yes)
		OBJCFLAGS="$old_OBJCFLAGS"
	])

	old_OBJCFLAGS="$OBJCFLAGS"
	OBJCFLAGS="$OBJCFLAGS -Wunreachable-code -Werror"
	AC_MSG_CHECKING(whether -Wunreachable-code can be used)
	AC_COMPILE_IFELSE([
		AC_LANG_SOURCE([[
			#include <stdlib.h>

			struct objc_selector;
			typedef const struct objc_selector *SEL;

			{
				OF_DEALLOC_UNSUPPORTED
			}
			@end
		]])
	], [
		AC_MSG_RESULT(yes)
		OBJCFLAGS="$old_OBJCFLAGS -Wunreachable-code"
	], [
		AC_MSG_RESULT(no)
		OBJCFLAGS="$old_OBJCFLAGS"
	])

	old_OBJCFLAGS="$OBJCFLAGS"
	OBJCFLAGS="$OBJCFLAGS -Wdocumentation -Werror"
	AC_MSG_CHECKING(whether -Wdocumentation works correctly)
	AC_COMPILE_IFELSE([
		AC_LANG_SOURCE([
			/**
			 * @class Test conftest.m conftest.m
			 */
			#ifdef __has_attribute

			/**
			 * @struct Foo conftest.m conftest.m
			 */
			typedef struct {} Foo;
		])
	], [
		AC_MSG_RESULT(yes)
		OBJCFLAGS="$old_OBJCFLAGS -Wdocumentation"
	], [
		AC_MSG_RESULT(no)
		OBJCFLAGS="$old_OBJCFLAGS"
	])

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

				#include <assert.h>

					 */
					assert(1);
				}
				@end
			])
		], [
			AC_MSG_RESULT(no)
			OBJCFLAGS="$old_OBJCFLAGS -pedantic"
		], [
			AC_MSG_RESULT(yes)
			OBJCFLAGS="$old_OBJCFLAGS"
		])
	])

	old_OBJCFLAGS="$OBJCFLAGS"
	OBJCFLAGS="$OBJCFLAGS -Werror"
	AC_MSG_CHECKING(whether we need -Wno-strict-prototypes)
	AC_COMPILE_IFELSE([
		AC_LANG_PROGRAM([
			#include <signal.h>
		], [
			signal(SIGINT, SIG_DFL);
		])
	], [
		AC_MSG_RESULT(no)
		OBJCFLAGS="$old_OBJCFLAGS"
	], [
		AC_MSG_RESULT(yes)
		OBJCFLAGS="$old_OBJCFLAGS -Wno-strict-prototypes"
	])

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

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