POSIX specifies [1] that <math.h> should declare frexpl() and ldexpl() but
neither glibc not MacOS X 10.3 do so. (Paul, do you agree that it looks like
a glibc bug?)
Here is a cheap workaround for the 'printf-frexpl' module.
2007-03-05 Bruno Haible <[EMAIL PROTECTED]>
* m4/printf-frexpl.m4 (gl_FUNC_PRINTF_FREXPL): Also test whether
frexpl and ldexpl are declared.
* lib/printf-frexp.c (frexpl, ldexpl): Provide fallback declarations.
*** m4/printf-frexpl.m4 3 Mar 2007 13:57:24 -0000 1.1
--- m4/printf-frexpl.m4 6 Mar 2007 03:31:34 -0000
***************
*** 1,4 ****
! # printf-frexpl.m4 serial 1
dnl Copyright (C) 2007 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
--- 1,4 ----
! # printf-frexpl.m4 serial 2
dnl Copyright (C) 2007 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
***************
*** 23,28 ****
--- 23,31 ----
if test $gl_cv_func_frexpl_no_libm = yes; then
AC_DEFINE([HAVE_FREXPL_IN_LIBC], 1,
[Define if the frexpl function is available in libc.])
+ dnl Also check whether it's declared. glibc (2.3..2.5 at least) and
+ dnl MacOS X 10.3 have frexpl() in libc but don't declare it in <math.h>.
+ AC_CHECK_DECLS([frexpl])
fi
AC_CACHE_CHECK([whether ldexpl can be used without linking with libm],
***************
*** 38,43 ****
--- 41,49 ----
if test $gl_cv_func_ldexpl_no_libm = yes; then
AC_DEFINE([HAVE_LDEXPL_IN_LIBC], 1,
[Define if the ldexpl function is available in libc.])
+ dnl Also check whether it's declared. glibc (2.3..2.5 at least) and
+ dnl MacOS X 10.3 have ldexpl() in libc but don't declare it in <math.h>.
+ AC_CHECK_DECLS([ldexpl])
fi
fi
])
*** lib/printf-frexp.c 25 Feb 2007 18:08:24 -0000 1.3
--- lib/printf-frexp.c 6 Mar 2007 03:31:34 -0000
***************
*** 41,46 ****
--- 41,54 ----
# define USE_FREXP_LDEXP
# define FREXP frexpl
# define LDEXP ldexpl
+ /* glibc (2.3..2.5 at least) and MacOS X 10.3 have frexpl and ldexpl in
+ libc, but don't declare them. */
+ # if !HAVE_DECL_FREXPL
+ extern long double frexpl (long double, int *);
+ # endif
+ # if !HAVE_DECL_LDEXPL
+ extern long double ldexpl (long double, int);
+ # endif
# endif
# define L_(literal) literal##L
# else
[1] http://www.opengroup.org/susv3/basedefs/math.h.html
