[PATCH] stdlib/tst-strtod-round.c: Fix build on ARM

[Will Newton]

Building this test on ARM fails because the prototypes for the long
double variants of the math functions are unavailable.

Add an additional include guard to math.h that enables long double math
function declarations if _LIBC_TEST is defined and define _LIBC_TEST in
stdlib/tst-strtod-round.c.

ChangeLog:

2014-09-16  Will Newton  <will.newton@linaro.org>

	* math/math.h: Define long double math functions if
	_LIBC_TEST is defined.
	* stdlib/tst-strtod-round.c: Define _LIBC_TEST.
---
 math/math.h               | 2 +-
 stdlib/tst-strtod-round.c | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/math/math.h b/math/math.h
index 72ec2ca..dc7ab2d 100644
--- a/math/math.h
+++ b/math/math.h
@@ -91,7 +91,7 @@ __BEGIN_DECLS
 # undef _Mdouble_END_NAMESPACE
 # undef	__MATH_PRECNAME
 
-# if !(defined __NO_LONG_DOUBLE_MATH && defined _LIBC) \
+# if !(defined __NO_LONG_DOUBLE_MATH && defined _LIBC && !defined _LIBC_TEST) \
      || defined __LDBL_COMPAT
 #  ifdef __LDBL_COMPAT
 
diff --git a/stdlib/tst-strtod-round.c b/stdlib/tst-strtod-round.c
index f334b20..cbde457 100644
--- a/stdlib/tst-strtod-round.c
+++ b/stdlib/tst-strtod-round.c
@@ -17,6 +17,9 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
+/* Defining _LIBC_TEST ensures long double math functions are
+   declared in the headers.  */
+#define _LIBC_TEST 1
 #include <fenv.h>
 #include <float.h>
 #include <math.h>
-- 
1.9.3