Add tests for all C11 headers.
Well, all except <threads.h> which we have no current plans to implement.
The only thing this turned up is that clang's <float.h> doesn't define
FLT_HAS_SUBNORM/DBL_HAS_SUBNORM/LDBL_HAS_SUBNORM, so for now we assert
that those are missing so that when we get a fixed clang, we notice.
Also the <tgmath.h> is utterly perfunctory, but seems like an appropriate
amount of effort to put in.
Bug: N/A
Test: ran tests
Change-Id: I7f7a7040b3271ceda625bee8a40a9d8cef52ee44
diff --git a/tests/limits_test.cpp b/tests/limits_test.cpp
new file mode 100644
index 0000000..1d48ffe
--- /dev/null
+++ b/tests/limits_test.cpp
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <gtest/gtest.h>
+
+#include <limits.h>
+
+TEST(limits, macros) {
+#if CHAR_BIT != 8
+#error Insane CHAR_BIT
+#endif
+#if !defined(MB_LEN_MAX)
+#error MB_LEN_MAX
+#endif
+#if !defined(CHAR_MIN)
+#error CHAR_MIN
+#endif
+#if !defined(CHAR_MAX)
+#error CHAR_MAX
+#endif
+#if !defined(SCHAR_MIN)
+#error SCHAR_MIN
+#endif
+#if !defined(SCHAR_MAX)
+#error SCHAR_MAX
+#endif
+#if !defined(SHRT_MIN)
+#error SHRT_MIN
+#endif
+#if !defined(SHRT_MAX)
+#error SHRT_MAX
+#endif
+#if !defined(INT_MIN)
+#error INT_MIN
+#endif
+#if !defined(INT_MAX)
+#error INT_MAX
+#endif
+#if !defined(LONG_MIN)
+#error LONG_MIN
+#endif
+#if !defined(LONG_MAX)
+#error LONG_MAX
+#endif
+#if !defined(LLONG_MIN)
+#error LLONG_MIN
+#endif
+#if !defined(LLONG_MAX)
+#error LLONG_MAX
+#endif
+#if !defined(UCHAR_MAX)
+#error UCHAR_MAX
+#endif
+#if !defined(USHRT_MAX)
+#error USHRT_MAX
+#endif
+#if !defined(UINT_MAX)
+#error UINT_MAX
+#endif
+#if !defined(ULONG_MAX)
+#error ULONG_MAX
+#endif
+#if !defined(ULLONG_MAX)
+#error ULLONG_MAX
+#endif
+}