93 lines
3.1 KiB
Plaintext
93 lines
3.1 KiB
Plaintext
# tanl.m4
|
|
# serial 10
|
|
dnl Copyright (C) 2010-2024 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.
|
|
dnl This file is offered as-is, without any warranty.
|
|
|
|
AC_DEFUN([gl_FUNC_TANL],
|
|
[
|
|
AC_REQUIRE([gl_MATH_H_DEFAULTS])
|
|
AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
|
|
|
|
dnl Persuade glibc <math.h> to declare tanl().
|
|
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
|
|
|
|
TANL_LIBM=
|
|
AC_CACHE_CHECK([whether tanl() can be used without linking with libm],
|
|
[gl_cv_func_tanl_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 (* volatile funcptr) (long double) = tanl;
|
|
long double x;]],
|
|
[[return funcptr (x) > 0.4
|
|
|| tanl (x) > 0.4;]])],
|
|
[gl_cv_func_tanl_no_libm=yes],
|
|
[gl_cv_func_tanl_no_libm=no])
|
|
])
|
|
if test $gl_cv_func_tanl_no_libm = no; then
|
|
AC_CACHE_CHECK([whether tanl() can be used with libm],
|
|
[gl_cv_func_tanl_in_libm],
|
|
[
|
|
saved_LIBS="$LIBS"
|
|
LIBS="$LIBS -lm"
|
|
AC_LINK_IFELSE(
|
|
[AC_LANG_PROGRAM(
|
|
[[#ifndef __NO_MATH_INLINES
|
|
# define __NO_MATH_INLINES 1 /* for glibc */
|
|
#endif
|
|
#include <math.h>
|
|
long double (* volatile funcptr) (long double) = tanl;
|
|
long double x;]],
|
|
[[return funcptr (x) > 0.4
|
|
|| tanl (x) > 0.4;]])],
|
|
[gl_cv_func_tanl_in_libm=yes],
|
|
[gl_cv_func_tanl_in_libm=no])
|
|
LIBS="$saved_LIBS"
|
|
])
|
|
if test $gl_cv_func_tanl_in_libm = yes; then
|
|
TANL_LIBM=-lm
|
|
fi
|
|
fi
|
|
if test $gl_cv_func_tanl_no_libm = yes \
|
|
|| test $gl_cv_func_tanl_in_libm = yes; then
|
|
dnl Also check whether it's declared.
|
|
dnl Mac OS X 10.3 has tanl() in libc but doesn't declare it in <math.h>.
|
|
AC_CHECK_DECL([tanl], , [HAVE_DECL_TANL=0], [[#include <math.h>]])
|
|
else
|
|
HAVE_DECL_TANL=0
|
|
HAVE_TANL=0
|
|
dnl Find libraries needed to link lib/tanl.c, lib/trigl.c.
|
|
if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
|
|
AC_REQUIRE([gl_FUNC_TAN])
|
|
TANL_LIBM="$TAN_LIBM"
|
|
else
|
|
AC_REQUIRE([gl_FUNC_ISNANL])
|
|
AC_REQUIRE([gl_FUNC_FLOOR])
|
|
AC_REQUIRE([gl_FUNC_FLOORL])
|
|
dnl Append $ISNANL_LIBM to TANL_LIBM, avoiding gratuitous duplicates.
|
|
case " $TANL_LIBM " in
|
|
*" $ISNANL_LIBM "*) ;;
|
|
*) TANL_LIBM="$TANL_LIBM $ISNANL_LIBM" ;;
|
|
esac
|
|
dnl Append $FLOOR_LIBM to TANL_LIBM, avoiding gratuitous duplicates.
|
|
case " $TANL_LIBM " in
|
|
*" $FLOOR_LIBM "*) ;;
|
|
*) TANL_LIBM="$TANL_LIBM $FLOOR_LIBM" ;;
|
|
esac
|
|
dnl Append $FLOORL_LIBM to TANL_LIBM, avoiding gratuitous duplicates.
|
|
case " $TANL_LIBM " in
|
|
*" $FLOORL_LIBM "*) ;;
|
|
*) TANL_LIBM="$TANL_LIBM $FLOORL_LIBM" ;;
|
|
esac
|
|
fi
|
|
fi
|
|
AC_SUBST([TANL_LIBM])
|
|
])
|