mirror of
https://git.savannah.gnu.org/git/gnulib.git
synced 2025-08-17 12:41:05 +03:00
a3fd683de3
* build-aux/gendocs.sh (version): * doc/gendocs_template: * doc/gendocs_template_min: * doc/gnulib.texi: * lib/version-etc.c (COPYRIGHT_YEAR): Update copyright dates by hand in templates and the like. * all files: Run 'make update-copyright'.
55 lines
1.9 KiB
Plaintext
55 lines
1.9 KiB
Plaintext
# ldexp.m4 serial 1
|
|
dnl Copyright (C) 2010-2017 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_DEFUN([gl_FUNC_LDEXP],
|
|
[
|
|
AC_REQUIRE([gl_CHECK_LDEXP_NO_LIBM])
|
|
LDEXP_LIBM=
|
|
if test $gl_cv_func_ldexp_no_libm = no; then
|
|
AC_CACHE_CHECK([whether ldexp() can be used with libm],
|
|
[gl_cv_func_ldexp_in_libm],
|
|
[
|
|
save_LIBS="$LIBS"
|
|
LIBS="$LIBS -lm"
|
|
AC_LINK_IFELSE(
|
|
[AC_LANG_PROGRAM([[#ifndef __NO_MATH_INLINES
|
|
# define __NO_MATH_INLINES 1 /* for glibc */
|
|
#endif
|
|
#include <math.h>
|
|
double (*funcptr) (double, int) = ldexp;
|
|
double x;]],
|
|
[[return ldexp (x, -1) > 0;]])],
|
|
[gl_cv_func_ldexp_in_libm=yes],
|
|
[gl_cv_func_ldexp_in_libm=no])
|
|
LIBS="$save_LIBS"
|
|
])
|
|
if test $gl_cv_func_ldexp_in_libm = yes; then
|
|
LDEXP_LIBM=-lm
|
|
fi
|
|
fi
|
|
AC_SUBST([LDEXP_LIBM])
|
|
])
|
|
|
|
dnl Test whether ldexp() can be used without linking with libm.
|
|
dnl Set gl_cv_func_ldexp_no_libm to 'yes' or 'no' accordingly.
|
|
AC_DEFUN([gl_CHECK_LDEXP_NO_LIBM],
|
|
[
|
|
AC_CACHE_CHECK([whether ldexp() can be used without linking with libm],
|
|
[gl_cv_func_ldexp_no_libm],
|
|
[
|
|
AC_LINK_IFELSE(
|
|
[AC_LANG_PROGRAM([[#ifndef __NO_MATH_INLINES
|
|
# define __NO_MATH_INLINES 1 /* for glibc */
|
|
#endif
|
|
#include <math.h>
|
|
double (*funcptr) (double, int) = ldexp;
|
|
double x;]],
|
|
[[return ldexp (x, -1) > 0;]])],
|
|
[gl_cv_func_ldexp_no_libm=yes],
|
|
[gl_cv_func_ldexp_no_libm=no])
|
|
])
|
|
])
|