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# tanl.m4 serial 9
dnl Copyright (C) 2010-2021 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_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 $gl_cv_func_tanl_no_libm = no; then
AC_CACHE_CHECK([whether tanl() can be used with libm],
[gl_cv_func_tanl_in_libm],
[
save_LIBS="$LIBS"
LIBS="$LIBS -lm"
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
long double (* volatile funcptr) (long double) = tanl;
long double x;]],
[[return funcptr (x) > 0.4
|| tanl (x) > 0.4;]])],
[gl_cv_func_tanl_in_libm=yes],
[gl_cv_func_tanl_in_libm=no])
LIBS="$save_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])
])
|
