Add support for checking for isinf().

Patch contributed by Bill Wendling.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15052 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/autoconf/acinclude.m4 b/autoconf/acinclude.m4
index 364ecca50860912f9e793fbbeedb827e2db07c1f..a157839f2224f0b7792e632b37ad0f31e8c7496d 100644 (file)
--- a/autoconf/acinclude.m4
+++ b/autoconf/acinclude.m4
@@ -6282,3 +6282,17 @@ AC_SINGLE_CXX_CHECK([HAVE_STD_ISNAN_IN_CMATH], [ac_cv_func_std_isnan_in_cmath],
                      using std::isnan; int foo(float f) {return isnan(f);}])
 ])
 
+AC_DEFUN([AC_FUNC_ISINF],[
+AC_SINGLE_CXX_CHECK([HAVE_ISINF_IN_MATH_H],    [ac_cv_func_isinf_in_math_h],   
+                    [isinf], [<math.h>],
+                    [#include <math.h>
+                     int foo(float f) {return isinf(f);}])
+AC_SINGLE_CXX_CHECK([HAVE_ISINF_IN_CMATH],     [ac_cv_func_isinf_in_cmath],    
+                    [isinf], [<cmath>],
+                    [#include <cmath>
+                     int foo(float f) {return isinf(f);}])
+AC_SINGLE_CXX_CHECK([HAVE_STD_ISINF_IN_CMATH], [ac_cv_func_std_isinf_in_cmath],
+                    [std::isinf], [<cmath>],
+                    [#include <cmath>
+                     using std::isinf; int foo(float f) {return isinf(f);}])
+])