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[SE-0160] Make deprecated @objc inference warnings opt-in.

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The warnings about deprecated @objc inference in Swift 3 mode can be a
bit annoying; and are mostly relevant to the migration workflow. Make
the warning emission a three-state switch:

* None (the default): don't warn about these issues.
* Minimal (-warn-swift3-objc-inference-minimal): warn about direct
  uses of @objc entrypoints and provide "@objc" Fix-Its for them.
* Complete (-warn-swift3-objc-inference-complete): warn about all
  cases where Swift 3 infers @objc but Swift 4 will not.

Fixes rdar://problem/31922278.
This commit is contained in:
Doug Gregor
2017-05-01 16:25:50 -07:00
parent f7bccb0e68
commit 66b11cbc3d
10 changed files with 69 additions and 27 deletions
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12
lib/Frontend/CompilerInvocation.cpp
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@@ -1011,13 +1011,23 @@ static bool ParseLangArgs(LangOptions &Opts, ArgList &Args,
}
Opts.EnableAppExtensionRestrictions |= Args.hasArg(OPT_enable_app_extension);
Opts.WarnSwift3ObjCInference |= Args.hasArg(OPT_warn_swift3_objc_inference);
Opts.EnableSwift3ObjCInference =
Args.hasFlag(OPT_enable_swift3_objc_inference,
OPT_disable_swift3_objc_inference,
Opts.isSwiftVersion3());
if (Opts.EnableSwift3ObjCInference) {
if (const Arg *A = Args.getLastArg(
OPT_warn_swift3_objc_inference_minimal,
OPT_warn_swift3_objc_inference_complete)) {
if (A->getOption().getID() == OPT_warn_swift3_objc_inference_minimal)
Opts.WarnSwift3ObjCInference = Swift3ObjCInferenceWarnings::Minimal;
else
Opts.WarnSwift3ObjCInference = Swift3ObjCInferenceWarnings::Complete;
}
}
llvm::Triple Target = Opts.Target;
StringRef TargetArg;
if (const Arg *A = Args.getLastArg(OPT_target)) {