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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
|
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>
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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>
struct objc_selector;
typedef const struct objc_selector *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]; \
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# define OF_DEALLOC_UNSUPPORTED \
[self doesNotRecognizeSelector: _cmd]; \
\
abort(); \
\
[super dealloc];
#endif
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# define OF_DEALLOC_UNSUPPORTED \
[self doesNotRecognizeSelector: _cmd]; \
\
abort(); \
\
[super dealloc];
#endif
@implementation Foo
- (void)dealloc
{
OF_DEALLOC_UNSUPPORTED
}
@end
]])
|