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# sqrtl.m4 serial 2
dnl Copyright (C) 2010 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_SQRTL],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
dnl Persuade glibc <math.h> to declare sqrtl().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
SQRTL_LIBM=
AC_CACHE_CHECK([whether sqrtl() can be used without linking with libm],
[gl_cv_func_sqrtl_no_libm],
[
AC_TRY_LINK([#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
long double x;],
[return sqrtl (x) > 0.4;],
[gl_cv_func_sqrtl_no_libm=yes],
[gl_cv_func_sqrtl_no_libm=no])
])
if test $gl_cv_func_sqrtl_no_libm = no; then
AC_CACHE_CHECK([whether sqrtl() can be used with libm],
[gl_cv_func_sqrtl_in_libm],
[
save_LIBS="$LIBS"
LIBS="$LIBS -lm"
AC_TRY_LINK([#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
long double x;],
[return sqrtl (x) > 0.4;],
[gl_cv_func_sqrtl_in_libm=yes],
[gl_cv_func_sqrtl_in_libm=no])
LIBS="$save_LIBS"
])
if test $gl_cv_func_sqrtl_in_libm = yes; then
SQRTL_LIBM=-lm
fi
fi
if test $gl_cv_func_sqrtl_no_libm = yes \
|| test $gl_cv_func_sqrtl_in_libm = yes; then
dnl Also check whether it's declared.
dnl MacOS X 10.3 has sqrtl() in libc but doesn't declare it in <math.h>.
AC_CHECK_DECL([sqrtl], , [HAVE_DECL_SQRTL=0], [#include <math.h>])
else
HAVE_DECL_SQRTL=0
HAVE_SQRTL=0
AC_LIBOBJ([sqrtl])
AC_REQUIRE([gl_FUNC_ISNANL])
AC_REQUIRE([gl_FUNC_FREXPL])
AC_REQUIRE([gl_FUNC_LDEXPL])
AC_REQUIRE([gl_FUNC_SQRT])
dnl Append $ISNANL_LIBM to SQRTL_LIBM, avoiding gratuitous duplicates.
case " $SQRTL_LIBM " in
*" $ISNANL_LIBM "*) ;;
*) SQRTL_LIBM="$SQRTL_LIBM $ISNANL_LIBM" ;;
esac
dnl Append $FREXPL_LIBM to SQRTL_LIBM, avoiding gratuitous duplicates.
case " $SQRTL_LIBM " in
*" $FREXPL_LIBM "*) ;;
*) SQRTL_LIBM="$SQRTL_LIBM $FREXPL_LIBM" ;;
esac
dnl Append $LDEXPL_LIBM to SQRTL_LIBM, avoiding gratuitous duplicates.
case " $SQRTL_LIBM " in
*" $LDEXPL_LIBM "*) ;;
*) SQRTL_LIBM="$SQRTL_LIBM $LDEXPL_LIBM" ;;
esac
dnl Append $SQRT_LIBM to SQRTL_LIBM, avoiding gratuitous duplicates.
case " $SQRTL_LIBM " in
*" $SQRT_LIBM "*) ;;
*) SQRTL_LIBM="$SQRTL_LIBM $SQRT_LIBM" ;;
esac
fi
AC_SUBST([SQRTL_LIBM])
])
|
