Disable most of the google-readability-casting check for non-C++ files (only

leave the "redundant cast to the same type" part).

llvm-svn: 218225

clang-tools-extra/clang-tidy/google/AvoidCStyleCastsCheck.cpp

@@ -78,6 +78,10 @@ void AvoidCStyleCastsCheck::check(const MatchFinder::MatchResult &Result) {
     return;
   }
 
+  // The rest of this check is only relevant to C++.
+  if (!Result.Context->getLangOpts().CPlusPlus)
+    return;
+
   std::string DestTypeString = CastExpr->getTypeAsWritten().getAsString();
 
   auto diag_builder =

clang-tools-extra/test/clang-tidy/avoid-c-style-casts.c

@@ -0,0 +1,9 @@
+// RUN: $(dirname %s)/check_clang_tidy_fix.sh %s google-readability-casting %t -x c
+// REQUIRES: shell
+
+void f(const char *cpc) {
+  const char *cpc2 = (const char*)cpc;
+  // CHECK-MESSAGES: :[[@LINE-1]]:22: warning: Redundant cast to the same type. [google-readability-casting]
+  // CHECK-FIXES: const char *cpc2 = cpc;
+  char *pc = (char*)cpc;
+}

clang-tools-extra/test/clang-tidy/check_clang_tidy_fix.sh

@@ -14,6 +14,10 @@ CHECK_TO_RUN=$2
 TEMPORARY_FILE=$3.cpp
 # Feed the rest arguments to clang-tidy after --.
 shift 3
+CLANG_TIDY_ARGS=--std=c++11
+if (($# > 0)) ; then
+  CLANG_TIDY_ARGS=$*
+fi
 
 set -o errexit
 
@@ -23,7 +27,7 @@ set -o errexit
 sed 's#// *CHECK-[A-Z-]*:.*#//#' ${INPUT_FILE} > ${TEMPORARY_FILE}
 
 clang-tidy ${TEMPORARY_FILE} -fix --checks="-*,${CHECK_TO_RUN}" \
-  -- --std=c++11 $* > ${TEMPORARY_FILE}.msg 2>&1
+  -- ${CLANG_TIDY_ARGS} > ${TEMPORARY_FILE}.msg 2>&1
 
 FileCheck -input-file=${TEMPORARY_FILE} ${INPUT_FILE} \
   -check-prefix=CHECK-FIXES -strict-whitespace