-# copysignf.m4 serial 2
-dnl Copyright (C) 2011-2012 Free Software Foundation, Inc.
+# copysignf.m4 serial 3
+dnl Copyright (C) 2011-2013 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Determine COPYSIGNF_LIBM.
- gl_MATHFUNC([copysignf], [float], [(float, float)])
- if test $gl_cv_func_copysignf_no_libm = no \
- && test $gl_cv_func_copysignf_in_libm = no; then
+ gl_MATHFUNC([copysignf], [float], [(float, float)],
+ [extern
+ #ifdef __cplusplus
+ "C"
+ #endif
+ float copysignf (float, float);
+ ])
+ if test $gl_cv_func_copysignf_no_libm = yes \
+ || test $gl_cv_func_copysignf_in_libm = yes; then
+ HAVE_COPYSIGNF=1
+ dnl Also check whether it's declared.
+ dnl IRIX 6.5 has copysignf() in libm but doesn't declare it in <math.h>.
+ AC_CHECK_DECL([copysignf], , [HAVE_DECL_COPYSIGNF=0], [[#include <math.h>]])
+ else
HAVE_COPYSIGNF=0
+ HAVE_DECL_COPYSIGNF=0
COPYSIGNF_LIBM=
fi
AC_SUBST([COPYSIGNF_LIBM])