Check in this -Wconversion C++ test case that's been sitting on my machine

for awhile.

llvm-svn: 108232

clang/test/SemaCXX/conversion.cpp

@@ -0,0 +1,45 @@
+// RUN: %clang_cc1 -triple x86_64-apple-darwin -fsyntax-only -Wconversion -verify %s
+
+typedef   signed char  int8_t;
+typedef   signed short int16_t;
+typedef   signed int   int32_t;
+typedef   signed long  int64_t;
+
+typedef unsigned char  uint8_t;
+typedef unsigned short uint16_t;
+typedef unsigned int   uint32_t;
+typedef unsigned long  uint64_t;
+
+// <rdar://problem/7909130>
+namespace test0 {
+  int32_t test1_positive(char *I, char *E) {
+    return (E - I); // expected-warning {{implicit conversion loses integer precision}}
+  }
+
+  int32_t test1_negative(char *I, char *E) {
+    return static_cast<int32_t>(E - I);
+  }
+
+  uint32_t test2_positive(uint64_t x) {
+    return x; // expected-warning {{implicit conversion loses integer precision}}
+  }
+
+  uint32_t test2_negative(uint64_t x) {
+    return (uint32_t) x;
+  }
+}
+
+namespace test1 {
+  uint64_t test1(int x, unsigned y) {
+    return sizeof(x == y);
+  }
+
+  uint64_t test2(int x, unsigned y) {
+    return __alignof(x == y);
+  }
+
+  void * const foo();
+  bool test2(void *p) {
+    return p == foo();
+  }
+}