Fine-grained-dependencies on-by-default

Author: David Ungar

include/swift/Basic/LangOptions.h

@@ -298,7 +298,7 @@ namespace swift {
 
     /// Emit the newer, finer-grained swiftdeps file. Eventually will support
     /// faster rebuilds.
-    bool EnableFineGrainedDependencies = false;
+    bool EnableFineGrainedDependencies = true;
 
     /// When using fine-grained dependencies, emit dot files for every swiftdeps
     /// file.

include/swift/Driver/Compilation.h

@@ -327,7 +327,7 @@ class Compilation {
               bool ShowDriverTimeCompilation = false,
               std::unique_ptr<UnifiedStatsReporter> Stats = nullptr,
               bool OnlyOneDependencyFile = false,
-              bool EnableFineGrainedDependencies = false,
+              bool EnableFineGrainedDependencies = true,
               bool VerifyFineGrainedDependencyGraphAfterEveryImport = false,
               bool EmitFineGrainedDependencyDotFileAfterEveryImport = false,
               bool FineGrainedDependenciesIncludeIntrafileOnes = false,

lib/Driver/Driver.cpp

@@ -966,7 +966,7 @@ Driver::buildCompilation(const ToolChain &TC,
     // relies on the new dependency graph
     const bool EnableFineGrainedDependencies =
         ArgList->hasFlag(options::OPT_enable_fine_grained_dependencies,
-                         options::OPT_disable_fine_grained_dependencies, false);
+                         options::OPT_disable_fine_grained_dependencies, true);
 
     const bool VerifyFineGrainedDependencyGraphAfterEveryImport = ArgList->hasArg(
         options::

lib/Frontend/CompilerInvocation.cpp

@@ -428,7 +428,7 @@ static bool ParseLangArgs(LangOptions &Opts, ArgList &Args,
 
   Opts.EnableFineGrainedDependencies =
       Args.hasFlag(options::OPT_enable_fine_grained_dependencies,
-                   options::OPT_disable_fine_grained_dependencies, false);
+                   options::OPT_disable_fine_grained_dependencies, true);
 
   if (Args.hasArg(OPT_emit_fine_grained_dependency_sourcefile_dot_files))
     Opts.EmitFineGrainedDependencySourcefileDotFiles = true;