Thanks Greg, I've submitted the bug report: rdar://31142152 I have to correct myself after double-checking the sys headers, some functions have indeed availability and weak_import attributes expanded through macro __OSX_AVAILABLE_STARTING.
On 18 Mar 2017, at 10:48, Greg Parker <gparker@apple.com> wrote:
Historically the libc headers have not used availability annotations. You should file a bug report asking that they do so, with a description of your specific use case.
On Mar 17, 2017, at 12:12 PM, Pavol Markovic <markovic@users.sourceforge.net> wrote:
I didn't think about that possibility but it should be doable. Thanks!
I still wonder why the function is not declared with weak_import attribute. I have just searched all headers in sys folder and it's not used in any of them. Is there a reason for that (i.e. keeping sys headers free of GNU C extensions)?
PM
On 18 Mar 2017, at 04:33, Damien DeVille <damien@ddeville.me> wrote:
Probably not ideal but if you have access to the source that uses `connectx` could you resolve the symbol at runtime on newer OS versions with dlopen/dlsym?
On Fri, Mar 17, 2017, at 03:23 AM, Pavol Markovic wrote:
Hello, I'm working on a product statically linking (non-system) libcurl and it is crashing on OS X 10.8 due to missing _connectx symbol in /usr/lib/libSystem.B.dylib
Man page shows that: The connectx() function call appeared in Darwin 15.0.0
Why is connectx() function in <sys/socket.h> not marked for weak-linking? As I understand it's recommended to use weak-linking when extending dynamic library (libsystem-kernel.dylib in this case).
As a result the libcurl cannot use connectx() fast tcp connect on 10.11 (and later) and at the same time targetting previous systems which do not have this function at all.
Any idea how to solve this except of doing preprocessor checks like:
#if defined(__MAC_OS_X_VERSION_MIN_REQUIRED) # if (__MAC_OS_X_VERSION_MIN_REQUIRED >= 101100) # define HAVE_DARWIN_CONNECTX 1 # endif #elif defined(__IPHONE_OS_VERSION_MIN_REQUIRED) # if (__IPHONE_OS_VERSION_MIN_REQUIRED >= 90000) # define HAVE_DARWIN_CONNECTX 1 # endif #elif defined(CONNECT_DATA_IDEMPOTENT) /* Fallback for other Darwin OS */ # define HAVE_DARWIN_CONNECTX 1 #endif
Best regards, Pavol Markovic _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/darwin-dev/damien%40ddeville.me
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