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# floorf.m4 serial 8
dnl Copyright (C) 2007, 2009-2010 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_FLOORF],
[
m4_divert_text([DEFAULTS], [gl_floorf_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
dnl Persuade glibc <math.h> to declare floorf().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Test whether floorf() is declared.
AC_CHECK_DECLS([floorf], , , [#include <math.h>])
if test "$ac_cv_have_decl_floorf" = yes; then
dnl Test whether floorf() can be used without libm.
gl_FUNC_FLOORF_LIBS
if test "$FLOORF_LIBM" = "?"; then
dnl Sun C 5.0 on Solaris declares floorf() and has it in the system-wide
dnl libm.so, but not in the libm.so that the compiler uses.
REPLACE_FLOORF=1
fi
m4_ifdef([gl_FUNC_FLOORF_IEEE], [
if test $gl_floorf_required = ieee && test $REPLACE_FLOORF = 0; then
AC_CACHE_CHECK([whether floorf works according to ISO C 99 with IEC 60559],
[gl_cv_func_floorf_ieee],
[
save_LIBS="$LIBS"
LIBS="$LIBS $FLOORF_LIBM"
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
]gl_FLOAT_MINUS_ZERO_CODE[
]gl_FLOAT_SIGNBIT_CODE[
int main()
{
/* Test whether floorf (-0.0f) is -0.0f. */
if (signbitf (minus_zerof) && !signbitf (floorf (minus_zerof)))
return 1;
return 0;
}
]])],
[gl_cv_func_floorf_ieee=yes],
[gl_cv_func_floorf_ieee=no],
[gl_cv_func_floorf_ieee="guessing no"])
LIBS="$save_LIBS"
])
case "$gl_cv_func_floorf_ieee" in
*yes) ;;
*) REPLACE_FLOORF=1 ;;
esac
fi
])
else
HAVE_DECL_FLOORF=0
fi
if test $HAVE_DECL_FLOORF = 0 || test $REPLACE_FLOORF = 1; then
AC_LIBOBJ([floorf])
FLOORF_LIBM=
fi
AC_SUBST([FLOORF_LIBM])
])
# Determines the libraries needed to get the floorf() function.
# Sets FLOORF_LIBM.
AC_DEFUN([gl_FUNC_FLOORF_LIBS],
[
gl_CACHE_VAL_SILENT([gl_cv_func_floorf_libm], [
gl_cv_func_floorf_libm=?
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
float x;]],
[[x = floorf(x);]])],
[gl_cv_func_floorf_libm=])
if test "$gl_cv_func_floorf_libm" = "?"; then
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>
float x;]],
[[x = floorf(x);]])],
[gl_cv_func_floorf_libm="-lm"])
LIBS="$save_LIBS"
fi
])
FLOORF_LIBM="$gl_cv_func_floorf_libm"
])
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