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# floorf.m4 serial 4
dnl Copyright (C) 2007, 2009 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],
[
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
else
REPLACE_FLOORF=1
fi
if test $REPLACE_FLOORF = 1; then
AC_LIBOBJ([floorf])
FLOORF_LIBM=
fi
AC_SUBST([REPLACE_FLOORF])
AC_SUBST([FLOORF_LIBM])
])
# Determines the libraries needed to get the floorf() function.
# Sets FLOORF_LIBM.
AC_DEFUN([gl_FUNC_FLOORF_LIBS],
[
gl_CACHE_VAL_SILENT([gl_cv_func_floorf_libm], [
gl_cv_func_floorf_libm=?
AC_TRY_LINK([
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
float x;],
[x = floorf(x);],
[gl_cv_func_floorf_libm=])
if test "$gl_cv_func_floorf_libm" = "?"; then
save_LIBS="$LIBS"
LIBS="$LIBS -lm"
AC_TRY_LINK([
#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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