On FreeBSD, define a macro that causes the unimplemented C99 math.h functions to be declared.  This prevents <cmath> users from being broken, unless they actually use the C++ wrappers that call the missing functions.



git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@144501 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/__config b/include/__config
index c78dab5..0f6c77d 100644
--- a/include/__config
+++ b/include/__config
@@ -374,6 +374,9 @@
 #if __APPLE__ || __FreeBSD__ || _WIN32
 #define _LIBCPP_LOCALE__L_EXTENSIONS 1
 #endif
+#if __FreeBSD__
+#define _DECLARE_C99_LDBL_MATH 1
+#endif
 
 #if __APPLE__ || __FreeBSD__
 #define _LIBCPP_HAS_DEFAULTRUNELOCALE