[gcc(refs/users/meissner/heads/work027)] Include math.h in nextafter-2.c test.

[Michael Meissner]

https://gcc.gnu.org/g:4d8dd8135ca58a2683160949f18d7b6a3d0744f2

commit 4d8dd8135ca58a2683160949f18d7b6a3d0744f2
Author: Michael Meissner <meissner@linux.ibm.com>
Date:   Sun Nov 15 00:41:14 2020 -0500

    Include math.h in nextafter-2.c test.
    
    2020-11-15  Michael Meissner  <meissner@linux.ibm.com>
    
            * gcc.dg/nextafter-2.c: Include math.h.

Diff:
---
 gcc/testsuite/gcc.dg/nextafter-2.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/gcc/testsuite/gcc.dg/nextafter-2.c b/gcc/testsuite/gcc.dg/nextafter-2.c
index e51ae94be0c..8149a709fa5 100644
--- a/gcc/testsuite/gcc.dg/nextafter-2.c
+++ b/gcc/testsuite/gcc.dg/nextafter-2.c
@@ -6,6 +6,18 @@
 
 #include <stdlib.h>
 
+/* In order to run on systems like the PowerPC that have 3 different long
+   double types, include math.h so it can choose what is the appropriate
+   nextafterl function to use.
+
+   If we didn't use -fno-builtin for this test, the PowerPC compiler would have
+   changed the names of the built-in functions that use long double.  The
+   nextafter-1.c function runs with this mapping.
+
+   Since this test uses -fno-builtin, include math.h, so that math.h can make
+   the appropriate choice to use.  */
+#include <math.h>
+
 #if defined(__GLIBC__) && defined(__GLIBC_PREREQ)
 # if !__GLIBC_PREREQ (2, 24)
 /* Workaround buggy nextafterl in glibc 2.23 and earlier,