Shrink the set of checks enabled by default.

Summary:
Enable only compiler diagnostics and safe static analyzer checks by
default. Let the defaults be conservative and safe for an average project.

Reviewers: djasper

Reviewed By: djasper

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D6027

llvm-svn: 220865
diff --git a/clang-tools-extra/clang-tidy/tool/ClangTidyMain.cpp b/clang-tools-extra/clang-tidy/tool/ClangTidyMain.cpp
index a925a74..5ef39bf 100644
--- a/clang-tools-extra/clang-tidy/tool/ClangTidyMain.cpp
+++ b/clang-tools-extra/clang-tidy/tool/ClangTidyMain.cpp
@@ -35,11 +35,10 @@
     "  option, command-line option takes precedence. The effective\n"
     "  configuration can be inspected using -dump-config.\n\n");
 
-const char DefaultChecks[] =
-    "*,"                       // Enable all checks, except these:
-    "-clang-analyzer-alpha*,"  // Too many false positives.
-    "-llvm-include-order,"     // Not implemented yet.
-    "-google-*,";              // Doesn't apply to LLVM.
+const char DefaultChecks[] =  // Enable these checks:
+    "clang-diagnostic-*,"     //   * compiler diagnostics
+    "clang-analyzer-*,"       //   * Static Analyzer checks
+    "-clang-analyzer-alpha*"; //   * but not alpha checks: many false positives
 
 static cl::opt<std::string>
 Checks("checks", cl::desc("Comma-separated list of globs with optional '-'\n"