math.h: Wrap C++ bits in extern "C++"

It is still common to include system header files in an extern "C"
block.  This means that exiting <math.h>'s own extern "C" block
is not sufficient to get back to C++ mode.  Use an extern "C++"
wrapper instead.

1 files changed, 6 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index e41c3e7330..2520c44371 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2016-10-22  Florian Weimer  <fweimer@redhat.com>
+
+	* math/math.h [__cplusplus] (iszero): Wrap C++ bits in extern
+	"C++", to override a potential extern "C" directive around the
+	header file inclusion.
+
 2016-10-21  Joseph Myers  <joseph@codesourcery.com>
 
 	* benchtests/Makefile (CFLAGS-bench-sqrt.c): New variable.