It's in FileUtils::removeDirectory(const std::string& path) and the deprecation text for system is -> Use posix_spawn APIs instead.

Xcode 9 is in beta version.

Use posix_spawn APIs instead.

@mars3142 could you please describe it in detail?

Right, but the system call is deprecated for iPhone since long time ago.

@minggo I only jumped into the definition of system in Xcode 9 (Beta with iOS 11), which is in stdlib.h

__swift_unavailable_on("Use posix_spawn APIs or NSTask instead.", "Process spawning is unavailable")
__API_AVAILABLE(macos(10.0)) __IOS_PROHIBITED
__WATCHOS_PROHIBITED __TVOS_PROHIBITED
int	 system(const char *) __DARWIN_ALIAS_C(system);

In Xcode 8 (iOS 10.12) showed nearly the same:

__swift_unavailable_on("Use posix_spawn APIs or NSTask instead.", "Process spawning is unavailable") __OSX_AVAILABLE_BUT_DEPRECATED_MSG(__MAC_10_0,__MAC_NA,__IPHONE_2_0,__IPHONE_8_0, "Use posix_spawn APIs instead.") __WATCHOS_PROHIBITED __TVOS_PROHIBITED int system(const char *) __DARWIN_ALIAS_C(system);

This is what I see and that way I thought posix_spawn will be the solution.

Ok, but i think we should use nftw as mentioned in the ticket.

fixed in #17921

I don't know why you say FIXED when it's NOT. I just downloaded v17 and the thing is still there.

Why did you say it is not fixed? How did you test?

I downloaded v3.17 from here: http://cocos2d-x.org/download
And got that same "'system': not available on iOS" when I tried building a game that was using version v3.10 before.