Add err test for char bit-fields #1047

test/err/bug1047.c

@@ -0,0 +1,82 @@
+/*
+  Copyright 2020 Google LLC
+
+  This software is provided 'as-is', without any express or implied
+  warranty. In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+/*
+  Tests of char bit-fields; see https://github.com/cc65/cc65/issues/1047
+*/
+
+#include <stdio.h>
+
+static unsigned char failures = 0;
+
+static struct chars {
+    unsigned char a : 3;
+    unsigned char b : 3;
+    unsigned char c : 3;
+} cs = {4, 1, 3};
+
+static void test_char_bitfield(void)
+{
+    if (sizeof (cs) != 2) {
+        printf("Got sizeof (cs) = %zu, expected 2.\n", sizeof (cs));
+        failures++;
+    }
+
+    if (cs.a != 4) {
+        printf("Got cs.a = %u, expected 4.\n", cs.a);
+        failures++;
+    }
+
+    if (cs.b != 1) {
+        printf("Got cs.b = %u, expected 1.\n", cs.b);
+        failures++;
+    }
+
+    if (cs.c != 3) {
+        printf("Got cs.c = %u, expected 3.\n", cs.c);
+        failures++;
+    }
+
+    cs.a = -1;
+    cs.b = 6;
+    cs.c = 1;
+
+    if (cs.a != 7) {
+        printf("Got cs.a = %u, expected 7.\n", cs.a);
+        failures++;
+    }
+
+    if (cs.b != 6) {
+        printf("Got cs.b = %u, expected 6.\n", cs.b);
+        failures++;
+    }
+
+    if (cs.c != 1) {
+        printf("Got cs.c = %u, expected 1.\n", cs.c);
+        failures++;
+    }
+}
+
+int main(void)
+{
+    test_char_bitfield();
+    printf("failures: %u\n", failures);
+    return failures;
+}