File: acinclude.m4

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dnl AC_TRY_CFLAGS (CFLAGS, [ACTION-IF-WORKS], [ACTION-IF-FAILS])
dnl check if $CC supports a given set of cflags
AC_DEFUN([AC_TRY_CFLAGS],
    [AC_MSG_CHECKING([if $CC supports $1 flags])
    SAVE_CFLAGS="$CFLAGS"
    CFLAGS="$1"
    AC_TRY_COMPILE([],[],[ac_cv_try_cflags_ok=yes],[ac_cv_try_cflags_ok=no])
    CFLAGS="$SAVE_CFLAGS"
    AC_MSG_RESULT([$ac_cv_try_cflags_ok])
    if test x"$ac_cv_try_cflags_ok" = x"yes"; then
        ifelse([$2],[],[:],[$2])
    else
        ifelse([$3],[],[:],[$3])
    fi])

dnl AC_C_ATTRIBUTE_ALIGNED
dnl define ATTRIBUTE_ALIGNED_MAX to the maximum alignment if this is supported
AC_DEFUN([AC_C_ATTRIBUTE_ALIGNED],
    [AC_CACHE_CHECK([__attribute__ ((aligned ())) support],
        [ac_cv_c_attribute_aligned],
        [ac_cv_c_attribute_aligned=0
        for ac_cv_c_attr_align_try in 2 4 8 16 32 64; do
            AC_TRY_COMPILE([],
                [static char c __attribute__ ((aligned($ac_cv_c_attr_align_try))) = 0; return c;],
                [ac_cv_c_attribute_aligned=$ac_cv_c_attr_align_try])
        done])
    if test x"$ac_cv_c_attribute_aligned" != x"0"; then
        AC_DEFINE_UNQUOTED([ATTRIBUTE_ALIGNED_MAX],
            [$ac_cv_c_attribute_aligned],[maximum supported data alignment])
    fi])

dnl @synopsis AC_C99_FUNC_LRINT
dnl
dnl Check whether C99's lrint function is available.
dnl @version 1.3	Feb 12 2002
dnl @author Erik de Castro Lopo <erikd AT mega-nerd DOT com>
dnl
dnl Permission to use, copy, modify, distribute, and sell this file for any 
dnl purpose is hereby granted without fee, provided that the above copyright 
dnl and this permission notice appear in all copies.  No representations are
dnl made about the suitability of this software for any purpose.  It is 
dnl provided "as is" without express or implied warranty.
dnl
AC_DEFUN([AC_C99_FUNC_LRINT],
[AC_CACHE_CHECK(for lrint,
  ac_cv_c99_lrint,
[
lrint_save_CFLAGS=$CFLAGS
CFLAGS="-O2 -lm"
AC_TRY_LINK([
#define		_ISOC9X_SOURCE	1
#define 	_ISOC99_SOURCE	1
#define		__USE_ISOC99	1
#define 	__USE_ISOC9X	1

#include <math.h>
], if (!lrint(3.14159)) lrint(2.7183);, ac_cv_c99_lrint=yes, ac_cv_c99_lrint=no)

CFLAGS=$lrint_save_CFLAGS

])

if test "$ac_cv_c99_lrint" = yes; then
  AC_DEFINE(HAVE_LRINT, 1,
            [Define if you have C99's lrint function.])
fi
])# AC_C99_FUNC_LRINT
dnl @synopsis AC_C99_FUNC_LRINTF
dnl
dnl Check whether C99's lrintf function is available.
dnl @version 1.3	Feb 12 2002
dnl @author Erik de Castro Lopo <erikd AT mega-nerd DOT com>
dnl
dnl Permission to use, copy, modify, distribute, and sell this file for any 
dnl purpose is hereby granted without fee, provided that the above copyright 
dnl and this permission notice appear in all copies.  No representations are
dnl made about the suitability of this software for any purpose.  It is 
dnl provided "as is" without express or implied warranty.
dnl
AC_DEFUN([AC_C99_FUNC_LRINTF],
[AC_CACHE_CHECK(for lrintf,
  ac_cv_c99_lrintf,
[
lrintf_save_CFLAGS=$CFLAGS
CFLAGS="-O2 -lm"
AC_TRY_LINK([
#define		_ISOC9X_SOURCE	1
#define 	_ISOC99_SOURCE	1
#define		__USE_ISOC99	1
#define 	__USE_ISOC9X	1

#include <math.h>
], if (!lrintf(3.14159)) lrintf(2.7183);, ac_cv_c99_lrintf=yes, ac_cv_c99_lrintf=no)

CFLAGS=$lrintf_save_CFLAGS

])

if test "$ac_cv_c99_lrintf" = yes; then
  AC_DEFINE(HAVE_LRINTF, 1,
            [Define if you have C99's lrintf function.])
fi
])# AC_C99_FUNC_LRINTF