Keep track of when declarations are "used" according to C and

C++. This logic is required to trigger implicit instantiation of
function templates and member functions of class templates, which will
be implemented separately.

This commit includes support for -Wunused-parameter, printing warnings
for named parameters that are not used within a function/Objective-C
method/block. Fixes <rdar://problem/6505209>.

llvm-svn: 73797

2 files changed, 24 insertions, 0 deletions

diff --git a/clang/test/Sema/warn-unused-parameters.c b/clang/test/Sema/warn-unused-parameters.c
new file mode 100644
index 00000000000..115bbab8151
--- /dev/null
+++ b/clang/test/Sema/warn-unused-parameters.c
@@ -0,0 +1,13 @@
+// RUN: clang -fsyntax-only -Wunused-parameter %s -Xclang -verify
+
+int f0(int x,
+       int y, // expected-warning{{unused}}
+       int z __attribute__((unused))) {
+  return x;
+}
+
+void f1() {
+  (void)^(int x,
+          int y, // expected-warning{{unused}}
+          int z __attribute__((unused))) { return x; };
+}
\ No newline at end of file
diff --git a/clang/test/SemaObjC/warn-unused-parameters.m b/clang/test/SemaObjC/warn-unused-parameters.m
new file mode 100644
index 00000000000..618dc3ff596
--- /dev/null
+++ b/clang/test/SemaObjC/warn-unused-parameters.m
@@ -0,0 +1,11 @@
+// RUN: clang -fsyntax-only -Wunused -Xclang -verify %s
+
+@interface foo
+- (int)meth: (int)x: (int)y: (int)z ;
+@end
+
+@implementation foo
+- (int) meth: (int)x: 
+              (int)y: // expected-warning{{unused}} 
+              (int) __attribute__((unused))z { return x; }
+@end