“Use Legacy Swift Language Version” (SWIFT_VERSION) is required to be configured correctly for targets which use Swift."
Xcode 8 seems to be wrongfully displaying a nonexistent ("phantom", if you will) No. There's a trivial fix for this:
- Click the tiny arrow next to
SWIFT_VERSIONto toggle the drop-down list. - Set the values for
DebugandReleasetoYes. - Set the values for
DebugandReleaseback toNo.
The image below was taken just after setting Debug to No. Xcode shows that both Debug and Release are set to No, however SWIFT_VERSION reads <Multiple Values>:
From this, I can only conclude that it is a bug; and that some value (or more probably a null value) is being misrepresented as No.
Please select the target in pod alamofire, search 'SWIFT_VERSION', select swift3.
Xcode 8.3.2 go to :
Build Settings > Swift Compiler - Viersion > change Swift Version
....works