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# logl.m4 serial 9
dnl Copyright (C) 2010-2012 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_LOGL],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
dnl Persuade glibc <math.h> to declare logl().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
LOGL_LIBM=
AC_CACHE_CHECK([whether logl() can be used without linking with libm],
[gl_cv_func_logl_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) = logl;
long double x;]],
[[return funcptr (x) > 1
|| logl (x) > 1;]])],
[gl_cv_func_logl_no_libm=yes],
[gl_cv_func_logl_no_libm=no])
])
if test $gl_cv_func_logl_no_libm = no; then
AC_CACHE_CHECK([whether logl() can be used with libm],
[gl_cv_func_logl_in_libm],
[
save_LIBS="$LIBS"
LIBS="$LIBS -lm"
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
long double (*funcptr) (long double) = logl;
long double x;]],
[[return funcptr (x) > 1
|| logl (x) > 1;]])],
[gl_cv_func_logl_in_libm=yes],
[gl_cv_func_logl_in_libm=no])
LIBS="$save_LIBS"
])
if test $gl_cv_func_logl_in_libm = yes; then
LOGL_LIBM=-lm
fi
fi
if test $gl_cv_func_logl_no_libm = yes \
|| test $gl_cv_func_logl_in_libm = yes; then
dnl Also check whether it's declared.
dnl Mac OS X 10.3 has logl() in libc but doesn't declare it in <math.h>.
AC_CHECK_DECL([logl], , [HAVE_DECL_LOGL=0], [[#include <math.h>]])
save_LIBS="$LIBS"
LIBS="$LIBS $LOGL_LIBM"
gl_FUNC_LOGL_WORKS
LIBS="$save_LIBS"
case "$gl_cv_func_logl_works" in
*yes) ;;
*) REPLACE_LOGL=1 ;;
esac
else
HAVE_LOGL=0
HAVE_DECL_LOGL=0
fi
if test $HAVE_LOGL = 0 || test $REPLACE_LOGL = 1; then
dnl Find libraries needed to link lib/logl.c.
if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
AC_REQUIRE([gl_FUNC_LOG])
LOGL_LIBM="$LOG_LIBM"
else
if test $HAVE_LOGL = 0; then
AC_REQUIRE([gl_FUNC_FREXPL])
AC_REQUIRE([gl_FUNC_ISNANL])
AC_REQUIRE([gl_FUNC_FLOORL])
dnl Append $FREXPL_LIBM to LOGL_LIBM, avoiding gratuitous duplicates.
case " $LOGL_LIBM " in
*" $FREXPL_LIBM "*) ;;
*) LOGL_LIBM="$LOGL_LIBM $FREXPL_LIBM" ;;
esac
dnl Append $ISNANL_LIBM to LOGL_LIBM, avoiding gratuitous duplicates.
case " $LOGL_LIBM " in
*" $ISNANL_LIBM "*) ;;
*) LOGL_LIBM="$LOGL_LIBM $ISNANL_LIBM" ;;
esac
dnl Append $FLOORL_LIBM to LOGL_LIBM, avoiding gratuitous duplicates.
case " $LOGL_LIBM " in
*" $FLOORL_LIBM "*) ;;
*) LOGL_LIBM="$LOGL_LIBM $FLOORL_LIBM" ;;
esac
fi
fi
fi
AC_SUBST([LOGL_LIBM])
])
dnl Test whether logl() works.
dnl On OSF/1 5.1, logl(-0.0L) is NaN.
AC_DEFUN([gl_FUNC_LOGL_WORKS],
[
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether logl works], [gl_cv_func_logl_works],
[
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <math.h>
volatile long double x;
long double y;
int main ()
{
x = -0.0L;
y = logl (x);
if (!(y + y == y))
return 1;
return 0;
}
]])],
[gl_cv_func_logl_works=yes],
[gl_cv_func_logl_works=no],
[case "$host_os" in
osf*) gl_cv_func_logl_works="guessing no";;
*) gl_cv_func_logl_works="guessing yes";;
esac
])
])
])
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