c99: in c99_math.h check that _USE_MATH_DEFINES is defined with MSVC

Reviewed-by: Jose Fonseca <jfonseca@vmware.com>
2015-02-26 10:19:37 -07:00
parent fb2ddef157
commit 688d7656c5
1 changed files with 5 additions and 0 deletions
@@ -40,6 +40,11 @@

 #if defined(_MSC_VER)

+/* This is to ensure that we get M_PI, etc. definitions */
+#if !defined(_USE_MATH_DEFINES)
+#error _USE_MATH_DEFINES define required when building with MSVC
+#endif 
+
 #if _MSC_VER < 1800
 #define isfinite(x) _finite((double)(x))
 #define isnan(x) _isnan((double)(x))