SystemConfiguration on watchOS is not available

[wkornewald]

I did this

I'm extending vcpkg with tvOS and watchOS support and trying to build curl, but this fails

CMake Error at CMakeLists.txt:661 (message):
  SystemConfiguration framework not found

Currently, curl requires SystemConfiguration:

curl/CMakeLists.txt

Line 662 in 51bc836

message(FATAL_ERROR "SystemConfiguration framework not found")

However, on watchOS this is not available, but I also don't want to include c-ares to skip that check.

I expected the following

Would it be possible to remove the strict dependency on SystemConfiguration for watchOS or maybe it makes sense in general to not fail if it's missing?

curl/libcurl version

curl 8.15.0

operating system

macOS 15.5, targeting watchOS 11.2

[bagder]

Would it be possible to remove the strict dependency on SystemConfiguration for watchOS

It's just code. Basically everything is possible. I'm not aware of any regular around here to be particularly knowledgeable about watchOS so feel free to tell us what makes sense for that!

or maybe it makes sense in general to not fail if it's missing?

What effect would that have on the different apple operating systems?

[wkornewald]

The only usage of that dependency seems to be intended for macOS for automagic conversion from IPv4 literals to IPv6 literals: https://github.com/curl/curl/blob/master/lib/macos.c

It looks like on iOS the workaround is already disabled:

curl/lib/curl_setup.h

Line 391 in 51bc836

# define CURL_MACOS_CALL_COPYPROXIES 1

So for tvOS and watchOS I'd suggest to also disable the code in curl_setup.h, too, same as for iOS.

[vszakats]

According the original commit implementing this: 8b7cbe9 #11516
IPHONEOS is supposed to exclude all mobile OS flavors.

I believe I made this regression by accidentally extending
the guard in CMake to all Apple, from macOS, in 739ef98 #13713.

Fix attempt: #18153

What suprises me is that it isn't caught by the iOS CI job:
https://github.com/curl/curl/actions/runs/16708936564/job/47290997983

[wkornewald]

On iOS and tvOS the SystemConfiguration API is actually available, so compilation won't fail there. Only watchOS doesn't have the API.

[wkornewald]

Thank you for the very quick fix. The PR looks good.

[vszakats]

@wkornewald Thanks for your report and test. I merged the fix.