Work around wxFinite() definition conflict with <cmath>.

Using the GNU libstdc++ or Clang's libc++ implementations of the
standard library, <cmath> inclusion undefines the isfinite macro,
resulting in compilation errors when wxFinite() is used.  <cmath> can be
included unintentionally, e.g.  wx/hashmap.h may result in its inclusion
when using STD containers.

Work around this mess by checking if one of these <cmath>
implementations were already included and using std::isfinite() in that
case.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74456 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

diff --git a/include/wx/math.h b/include/wx/math.h
index 5240f1759e527b4cf61b840bc53f4fd5a005e83b..c1dda9e6d2be5b68821e83af399e45283bbfd091 100644 (file)
--- a/include/wx/math.h
+++ b/include/wx/math.h
@@ -62,7 +62,12 @@
         add more compilers with C99 support here: using C99 isfinite() is
         preferable to using BSD-ish finite()
      */
-    #define wxFinite(x) isfinite(x)
+    #if defined(_GLIBCXX_CMATH) || defined(_LIBCPP_CMATH)
+        // these <cmath> headers #undef isfinite
+        #define wxFinite(x) std::isfinite(x)
+    #else
+        #define wxFinite(x) isfinite(x)
+    #endif
 #elif ( defined(__GNUG__)||defined(__GNUWIN32__)||defined(__DJGPP__)|| \
       defined(__SGI_CC__)||defined(__SUNCC__)||defined(__XLC__)|| \
       defined(__HPUX__) ) && ( !defined(wxOSX_USE_IPHONE) || wxOSX_USE_IPHONE == 0 )