[libcxx] Mark xonstexpr-fns.pass.cpp as XFAIL: gcc.

This fails with gcc because __builtin_isnan and friends, which
libcpp_isnan and friends call, are not themselves constexpr-evaluatable.

llvm-svn: 287041

diff --git a/libcxx/test/libcxx/numerics/c.math/constexpr-fns.pass.cpp b/libcxx/test/libcxx/numerics/c.math/constexpr-fns.pass.cpp
index 92b9103..1419b6c 100644 (file)
--- a/libcxx/test/libcxx/numerics/c.math/constexpr-fns.pass.cpp
+++ b/libcxx/test/libcxx/numerics/c.math/constexpr-fns.pass.cpp
@@ -15,7 +15,11 @@
 // constexpr-evaluatable, but that's what we check here, since we can't check
 // true constexpr-ness.
 //
+// This fails with gcc because __builtin_isnan and friends, which libcpp_isnan
+// and friends call, are not themselves constexpr-evaluatable.
+//
 // UNSUPPORTED: c++98, c++03
+// XFAIL: gcc
 
 #include <cmath>