1 files changed, 41 insertions, 0 deletions
diff --git a/test/SemaCXX/warn-literal-conversion.cpp b/test/SemaCXX/warn-literal-conversion.cpp
new file mode 100644
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--- /dev/null
+++ b/test/SemaCXX/warn-literal-conversion.cpp
@@ -0,0 +1,41 @@
+// RUN: %clang_cc1 -fsyntax-only -Wliteral-conversion -verify %s
+
+void foo(int y);
+
+// Warn when a literal float or double is assigned or bound to an integer.
+void test0() {
+  // Float
+  int y0 = 1.2222F; // expected-warning {{implicit conversion turns literal floating-point number into integer}}
+  int y1 = (1.2222F); // expected-warning {{implicit conversion turns literal floating-point number into integer}}
+  int y2 = (((1.2222F))); // expected-warning {{implicit conversion turns literal floating-point number into integer}}
+  int y3 = 12E1F; // expected-warning {{implicit conversion turns literal floating-point number into integer}}
+  int y4 = 1.2E1F; // expected-warning {{implicit conversion turns literal floating-point number into integer}}
+  // Double
+  int y5 = 1.2222; // expected-warning {{implicit conversion turns literal floating-point number into integer}}
+  int y6 = 12E1; // expected-warning {{implicit conversion turns literal floating-point number into integer}}
+  int y7 = 1.2E1; // expected-warning {{implicit conversion turns literal floating-point number into integer}}
+  int y8 = (1.2E1); // expected-warning {{implicit conversion turns literal floating-point number into integer}}
+
+  // Test assignment to an existing variable.
+  y8 = 2.22F; // expected-warning {{implicit conversion turns literal floating-point number into integer}}
+
+  // Test direct initialization.
+  int y9(1.23F); // expected-warning {{implicit conversion turns literal floating-point number into integer}}
+
+  // Test passing a literal floating-point value to a function that takes an integer.
+  foo(1.2F); // expected-warning {{implicit conversion turns literal floating-point number into integer}}
+
+  // FIXME: -Wconversion-literal doesn't catch "-1.2F".
+  int y10 = -1.2F;
+
+  // -Wconversion-literal does NOT catch const values.
+  // (-Wconversion DOES catch them.)
+  static const float sales_tax_rate = .095F;
+  int z = sales_tax_rate;
+  foo(sales_tax_rate);
+
+  // Expressions, such as those that indicate rounding-down, should NOT produce warnings.
+  int x = 24 * 0.5;
+  int y = (24*60*60) * 0.25;
+  int pennies = 123.45 * 100;
+}