-# logb.m4 serial 2
-dnl Copyright (C) 2010-2011 Free Software Foundation, Inc.
+# logb.m4 serial 4
+dnl Copyright (C) 2010-2012 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_MATH_H_DEFAULTS])
dnl Test whether logb() is declared.
- AC_CHECK_DECLS([logb], , , [#include <math.h>])
+ AC_CHECK_DECLS([logb], , , [[#include <math.h>]])
if test "$ac_cv_have_decl_logb" != yes; then
HAVE_DECL_LOGB=0
fi
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
- extern double logb (double x);
+ extern
+ #ifdef __cplusplus
+ "C"
+ #endif
+ double logb (double x);
double x;]],
[[x = logb(x);]])],
[LOGB_LIBM=])
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
- extern double logb (double x);
+ extern
+ #ifdef __cplusplus
+ "C"
+ #endif
+ double logb (double x);
double x;]],
[[x = logb(x);]])],
[LOGB_LIBM="-lm"])