FAILED: bootstrapping1/SwiftCompilerSources/Basic.o /nix/var/nix/builds/nix-build-swiftc-6.2.1+bootstrap.drv-0/b/source/build/bootstrapping1/SwiftCompilerSources/Basic.o
cd /nix/var/nix/builds/nix-build-swiftc-6.2.1+bootstrap.drv-0/b/source/SwiftCompilerSources && /nix/var/nix/builds/nix-build-swiftc-6.2.1+bootstrap.drv-0/b/source/build/bootstrapping0/bin/swiftc -c -o /nix/var/nix/builds/nix-buil>
<unknown>:0: warning: using (deprecated) legacy driver, Swift installation does not contain swift-driver at: '/nix/var/nix/builds/nix-build-swiftc-6.2.1+bootstrap.drv-0/b/source/build/bootstrapping0/bin/swift-driver-new'
/nix/store/bj5iys7xm7ba8xxsc6hb9q6zv9x5igs2-apple-sdk-14.4/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.4.sdk/usr/lib/swift/Swift.swiftmodule/arm64e-apple-macos.swiftinterface:10062:3: error: missing return in instance metho>
10060 |     }
10061 |     while true
10062 |   }
      |   `- error: missing return in instance method expected to return 'FlattenSequence<Base>.Iterator.Element?' (aka 'Optional<Base.Element.Element>')
10063 | }
10064 | extension Swift.FlattenSequence.Iterator : Swift.Sequence {

I'm getting these, when trying to build dovecot after a nixpkgs upgrade:

ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[3]: *** [Makefile:651: libssl_iostream_openssl.la] Fehler 1
make[3]: *** Es wird auf noch nicht beendete Prozesse gewartet …
libtool: link: ar cr .libs/libssl_iostream.a .libs/iostream-ssl.o .libs/iostream-ssl-context-cache.o .libs/iostream-ssl-test.o
libtool: link: ranlib .libs/libssl_iostream.a
libtool: link: ( cd ".libs" && rm -f "libssl_iostream.la" && ln -s "../libssl_iostream.la" "libssl_iostream.la" )
make[3]: Verzeichnis „/nix/var/nix/builds/nix-build-dovecot-2.3.21.1.drv-0/b/dovecot-2.3.21.1/src/lib-ssl-iostream“ wird verlassen
make[2]: *** [Makefile:573: all-recursive] Fehler 1
make[2]: Verzeichnis „/nix/var/nix/builds/nix-build-dovecot-2.3.21.1.drv-0/b/dovecot-2.3.21.1/src“ wird verlassen
make[1]: *** [Makefile:704: all-recursive] Fehler 1
make[1]: Verzeichnis „/nix/var/nix/builds/nix-build-dovecot-2.3.21.1.drv-0/b/dovecot-2.3.21.1“ wird verlassen
make: *** [Makefile:548: all] Fehler 2

Package version hasn't been updated in ages. I can see that the SDK was updated. Last time it successfully build I was using apple-sdk-11.3 in stdenv. Now we are using apple -sdk-14.4. Could this be related?

/nix/store/7x3jpimm3qaffhdcgj23rd51gpmy4p2f-apple-sdk-26.0/Platforms/MacOSX.platform/Developer/SDKs/MacOSX26.0.sdk/usr/lib/swift/Swift.swiftmodule/arm64e-apple-macos.swiftinterface:34793:42: error: Using type 'Int' can cause metadata allocation or locks

34791 |
34792 |   let queryVersion = (Int(major), Int(minor), Int(patch))
34793 |   let major32 = Int32(truncatingIfNeeded:Int(queryVersion.0))
      |                                          `- error: Using type 'Int' can cause metadata allocation or locks
34794 |   let minor32 = Int32(truncatingIfNeeded:Int(queryVersion.1))
34795 |   let patch32 = Int32(truncatingIfNeeded:Int(queryVersion.2))

Hi! A user for a flake of mine uses macOS. Unfortunately I don't own a Mac, so I have no idea of the nix-darwin ecosystem. They get this error when running an activation script. nixpkgs is the latest nixos-25.11 (but a week old one had the same result):

       last 9 log lines:
       > Running phase: patchPhase
       > Running phase: updateAutotoolsGnuConfigScriptsPhase
       > Running phase: configurePhase
       > no configure script, doing nothing
       > Running phase: buildPhase
       > Traceback (most recent call last):
       >   File "/nix/store/5g45axkqi74cigpqpz3s9yayn80k6dv7-build-config.py", line 4, in <module>
       >     import yaml
       > ModuleNotFoundError: No module named 'yaml'
       For full logs, run:
         nix log /nix/store/rs6nnmijyfhy9p4q1d1iyf2w4a2j9c44-riptide-build-config.drv