mirror of
https://git.savannah.gnu.org/git/gnulib.git
synced 2025-08-16 01:22:18 +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'.
79 lines
2.6 KiB
Plaintext
79 lines
2.6 KiB
Plaintext
# atanl.m4 serial 8
|
|
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_ATANL],
|
|
[
|
|
AC_REQUIRE([gl_MATH_H_DEFAULTS])
|
|
AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
|
|
|
|
dnl Persuade glibc <math.h> to declare atanl().
|
|
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
|
|
|
|
ATANL_LIBM=
|
|
AC_CACHE_CHECK([whether atanl() can be used without linking with libm],
|
|
[gl_cv_func_atanl_no_libm],
|
|
[
|
|
AC_LINK_IFELSE(
|
|
[AC_LANG_PROGRAM(
|
|
[[#ifndef __NO_MATH_INLINES
|
|
# define __NO_MATH_INLINES 1 /* for glibc */
|
|
#endif
|
|
#include <math.h>
|
|
long double (*funcptr) (long double) = atanl;
|
|
long double x;]],
|
|
[[return funcptr (x) > 1
|
|
|| atanl (x) > 1;]])],
|
|
[gl_cv_func_atanl_no_libm=yes],
|
|
[gl_cv_func_atanl_no_libm=no])
|
|
])
|
|
if test $gl_cv_func_atanl_no_libm = no; then
|
|
AC_CACHE_CHECK([whether atanl() can be used with libm],
|
|
[gl_cv_func_atanl_in_libm],
|
|
[
|
|
save_LIBS="$LIBS"
|
|
LIBS="$LIBS -lm"
|
|
AC_LINK_IFELSE(
|
|
[AC_LANG_PROGRAM(
|
|
[[#ifndef __NO_MATH_INLINES
|
|
# define __NO_MATH_INLINES 1 /* for glibc */
|
|
#endif
|
|
#include <math.h>
|
|
long double (*funcptr) (long double) = atanl;
|
|
long double x;]],
|
|
[[return funcptr (x) > 1
|
|
|| atanl (x) > 1;]])],
|
|
[gl_cv_func_atanl_in_libm=yes],
|
|
[gl_cv_func_atanl_in_libm=no])
|
|
LIBS="$save_LIBS"
|
|
])
|
|
if test $gl_cv_func_atanl_in_libm = yes; then
|
|
ATANL_LIBM=-lm
|
|
fi
|
|
fi
|
|
if test $gl_cv_func_atanl_no_libm = yes \
|
|
|| test $gl_cv_func_atanl_in_libm = yes; then
|
|
dnl Also check whether it's declared.
|
|
dnl Mac OS X 10.3 has atanl() in libc but doesn't declare it in <math.h>.
|
|
AC_CHECK_DECL([atanl], , [HAVE_DECL_ATANL=0], [[#include <math.h>]])
|
|
else
|
|
HAVE_DECL_ATANL=0
|
|
HAVE_ATANL=0
|
|
dnl Find libraries needed to link lib/atanl.c.
|
|
if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
|
|
AC_REQUIRE([gl_FUNC_ATAN])
|
|
ATANL_LIBM="$ATAN_LIBM"
|
|
else
|
|
AC_REQUIRE([gl_FUNC_ISNANL])
|
|
dnl Append $ISNANL_LIBM to ATANL_LIBM, avoiding gratuitous duplicates.
|
|
case " $ATANL_LIBM " in
|
|
*" $ISNANL_LIBM "*) ;;
|
|
*) ATANL_LIBM="$ATANL_LIBM $ISNANL_LIBM" ;;
|
|
esac
|
|
fi
|
|
fi
|
|
AC_SUBST([ATANL_LIBM])
|
|
])
|