[clang-tidy] Customize FileCheck prefix in check_clang-tidy.py

The patch introduces a new command line option '-check-suffix' for check_clang_tidy.py 
to allow multiple %check_clang_tidy% in a single test file.

Sample:

// RUN: %check_clang_tidy -check-suffix=FLAG-1 %s misc-unused-using-decls %t -- -- <options-set-1>
// RUN: %check_clang_tidy -check-suffix=FLAG-2 %s misc-unused-using-decls %t -- -- <options-set-2> 
...
+// CHECK-MESSAGES-FLAG-1: :[[@LINE-4]]:10: warning: using decl 'B' is unused [misc-unused-using-decls]
+// CHECK-MESSAGES-FLAG-2: :[[@LINE-7]]:10: warning: using decl 'A' is unused [misc-unused-using-decls]
+// CHECK-FIXES-FLAG-1-NOT: using a::A;$
+// CHECK-FIXES-FLAG-2-NOT: using a::B;$

Differential Revision: https://reviews.llvm.org/D45776

llvm-svn: 330511

1 files changed, 21 insertions, 0 deletions

diff --git a/clang-tools-extra/test/clang-tidy/check_clang_tidy.cpp b/clang-tools-extra/test/clang-tidy/check_clang_tidy.cpp
new file mode 100644
index 00000000000..5c1bf92eecd
--- /dev/null
+++ b/clang-tools-extra/test/clang-tidy/check_clang_tidy.cpp
@@ -0,0 +1,21 @@
+// RUN: %check_clang_tidy -check-suffix=USING-A %s misc-unused-using-decls %t -- -- -DUSING_A
+// RUN: %check_clang_tidy -check-suffix=USING-B %s misc-unused-using-decls %t -- -- -DUSING_B
+// RUN: %check_clang_tidy %s misc-unused-using-decls %t
+
+namespace a {class A {}; class B {}; class C {}; }
+namespace b {
+#if defined(USING_A)
+using a::A;
+#elif  defined(USING_B)
+using a::B;
+#else
+using a::C;
+#endif
+}
+namespace c {}
+// CHECK-MESSAGES-USING-A: :[[@LINE-8]]:10: warning: using decl 'A' {{.*}}
+// CHECK-MESSAGES-USING-B: :[[@LINE-7]]:10: warning: using decl 'B' {{.*}}
+// CHECK-MESSAGES: :[[@LINE-6]]:10: warning: using decl 'C' {{.*}}
+// CHECK-FIXES-USING-A-NOT: using a::A;$
+// CHECK-FIXES-USING-B-NOT: using a::B;$
+// CHECK-FIXES-NOT: using a::C;$