ref: 19cf5c2010eaf197a474b040fa49dd37a351f4a5
dir: /acinclude.m4/
dnl @synopsis AC_C_FIND_ENDIAN dnl dnl Determine endian-ness of target processor. dnl @version 1.1 Mar 03 2002 dnl @author Erik de Castro Lopo <erikd AT mega-nerd DOT com> dnl dnl Majority written from scratch to replace the standard autoconf macro dnl AC_C_BIGENDIAN. Only part remaining from the original it the invocation dnl of the AC_TRY_RUN macro. 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 Find endian-ness in the following way: dnl 1) Look in <endian.h>. dnl 2) If 1) fails, look in <sys/types.h> and <sys/param.h>. dnl 3) If 1) and 2) fails and not cross compiling run a test program. dnl 4) If 1) and 2) fails and cross compiling then guess based on target. AC_DEFUN([AC_C_FIND_ENDIAN], [AC_CACHE_CHECK(processor byte ordering, ac_cv_c_byte_order, # Initialize to unknown ac_cv_c_byte_order=unknown if test x$ac_cv_header_endian_h = xyes ; then # First try <endian.h> which should set BYTE_ORDER. [AC_TRY_LINK([ #include <endian.h> #if BYTE_ORDER != LITTLE_ENDIAN not big endian #endif ], return 0 ;, ac_cv_c_byte_order=little )] [AC_TRY_LINK([ #include <endian.h> #if BYTE_ORDER != BIG_ENDIAN not big endian #endif ], return 0 ;, ac_cv_c_byte_order=big )] fi if test $ac_cv_c_byte_order = unknown ; then [AC_TRY_LINK([ #include <sys/types.h> #include <sys/param.h> #if !BYTE_ORDER || !BIG_ENDIAN || !LITTLE_ENDIAN bogus endian macros #endif ], return 0 ;, [AC_TRY_LINK([ #include <sys/types.h> #include <sys/param.h> #if BYTE_ORDER != LITTLE_ENDIAN not big endian #endif ], return 0 ;, ac_cv_c_byte_order=little )] [AC_TRY_LINK([ #include <sys/types.h> #include <sys/param.h> #if BYTE_ORDER != LITTLE_ENDIAN not big endian #endif ], return 0 ;, ac_cv_c_byte_order=little )] )] fi if test $ac_cv_c_byte_order = unknown ; then if test $cross_compiling = yes ; then # This is the last resort. Try to guess the target processor endian-ness # by looking at the target CPU type. [ case "$target_cpu" in alpha* | i?86* | mipsel* | ia64*) ac_cv_c_big_endian=0 ac_cv_c_little_endian=1 ;; m68* | mips* | powerpc* | hppa* | sparc*) ac_cv_c_big_endian=1 ac_cv_c_little_endian=0 ;; esac ] else AC_TRY_RUN( [[ int main (void) { /* Are we little or big endian? From Harbison&Steele. */ union { long l ; char c [sizeof (long)] ; } u ; u.l = 1 ; return (u.c [sizeof (long) - 1] == 1); } ]], , ac_cv_c_byte_order=big, ac_cv_c_byte_order=unknown ) AC_TRY_RUN( [[int main (void) { /* Are we little or big endian? From Harbison&Steele. */ union { long l ; char c [sizeof (long)] ; } u ; u.l = 1 ; return (u.c [0] == 1); }]], , ac_cv_c_byte_order=little, ac_cv_c_byte_order=unknown ) fi fi ) ] if test $ac_cv_c_byte_order = big ; then ac_cv_c_big_endian=1 ac_cv_c_little_endian=0 elif test $ac_cv_c_byte_order = little ; then ac_cv_c_big_endian=0 ac_cv_c_little_endian=1 else ac_cv_c_big_endian=0 ac_cv_c_little_endian=0 AC_MSG_WARN([[*****************************************************************]]) AC_MSG_WARN([[*** Not able to determine endian-ness of target processor. ]]) AC_MSG_WARN([[*** The constants CPU_IS_BIG_ENDIAN and CPU_IS_LITTLE_ENDIAN in ]]) AC_MSG_WARN([[*** src/config.h may need to be hand editied. ]]) AC_MSG_WARN([[*****************************************************************]]) fi )# AC_C_FIND_ENDIAN dnl @synopsis AC_C99_FUNC_LRINT dnl dnl Check whether C99's lrint function is available. dnl @version 1.3 Feb 12 2002 dnl @author Erik de Castro Lopo <erikd AT mega-nerd DOT com> dnl dnl Permission to use, copy, modify, distribute, and sell this file for any dnl purpose is hereby granted without fee, provided that the above copyright dnl and this permission notice appear in all copies. No representations are dnl made about the suitability of this software for any purpose. It is dnl provided "as is" without express or implied warranty. dnl AC_DEFUN([AC_C99_FUNC_LRINT], [AC_CACHE_CHECK(for lrint, ac_cv_c99_lrint, [ lrint_save_CFLAGS=$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 "$ac_cv_c99_lrintf" = yes; then AC_DEFINE(HAVE_LRINTF, 1, [Define if you have C99's lrintf function.]) fi ])# AC_C99_FUNC_LRINTF dnl @synopsis AC_C99_FUNC_LLRINT dnl dnl Check whether C99's llrint function is available. dnl @version 1.1 Sep 30 2002 dnl @author Erik de Castro Lopo <erikd AT mega-nerd DOT com> dnl dnl Permission to use, copy, modify, distribute, and sell this file for any dnl purpose is hereby granted without fee, provided that the above copyright dnl and this permission notice appear in all copies. No representations are dnl made about the suitability of this software for any purpose. It is dnl provided "as is" without express or implied warranty. dnl AC_DEFUN([AC_C99_FUNC_LLRINT], [AC_CACHE_CHECK(for llrint, ac_cv_c99_llrint, [ llrint_save_CFLAGS=$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> #include <stdint.h> ], int64_t x ; x = llrint(3.14159) ;, ac_cv_c99_llrint=yes, ac_cv_c99_llrint=no) CFLAGS=$llrint_save_CFLAGS ]) if test "$ac_cv_c99_llrint" = yes; then AC_DEFINE(HAVE_LLRINT, 1, [Define if you have C99's llrint function.]) fi ])# AC_C99_FUNC_LLRINT dnl @synopsis AC_C_CLIP_MODE dnl dnl Determine the clipping mode when converting float to int. dnl @version 1.0 May 17 2003 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 Find the clipping mode in the following way: dnl 1) If we are not cross compiling test it. dnl 2) IF we are cross compiling, assume that clipping isn't done correctly. AC_DEFUN([AC_C_CLIP_MODE], [AC_CACHE_CHECK(processor clipping capabilities, ac_cv_c_clip_type, # Initialize to unknown ac_cv_c_clip_positive=unknown ac_cv_c_clip_negative=unknown if test $ac_cv_c_clip_positive = unknown ; then AC_TRY_RUN( [[ #define _ISOC9X_SOURCE 1 #define _ISOC99_SOURCE 1 #define __USE_ISOC99 1 #define __USE_ISOC9X 1 #include <math.h> int main (void) { double fval ; int k, ival ; fval = 1.0 * 0x7FFFFFFF ; for (k = 0 ; k < 100 ; k++) { ival = (lrint (fval)) >> 24 ; if (ival != 127) return 1 ; fval *= 1.2499999 ; } ; return 0 ; } ]], ac_cv_c_clip_positive=yes, ac_cv_c_clip_positive=no, ac_cv_c_clip_positive=unknown ) AC_TRY_RUN( [[ #define _ISOC9X_SOURCE 1 #define _ISOC99_SOURCE 1 #define __USE_ISOC99 1 #define __USE_ISOC9X 1 #include <math.h> int main (void) { double fval ; int k, ival ; fval = -8.0 * 0x10000000 ; for (k = 0 ; k < 100 ; k++) { ival = (lrint (fval)) >> 24 ; if (ival != -128) return 1 ; fval *= 1.2499999 ; } ; return 0 ; } ]], ac_cv_c_clip_negative=yes, ac_cv_c_clip_negative=no, ac_cv_c_clip_negative=unknown ) fi if test $ac_cv_c_clip_positive = yes ; then ac_cv_c_clip_positive=1 else ac_cv_c_clip_positive=0 fi if test $ac_cv_c_clip_negative = yes ; then ac_cv_c_clip_negative=1 else ac_cv_c_clip_negative=0 fi [[ case "$ac_cv_c_clip_positive$ac_cv_c_clip_negative" in "00") ac_cv_c_clip_type="none" ;; "10") ac_cv_c_clip_type="positive" ;; "01") ac_cv_c_clip_type="negative" ;; "11") ac_cv_c_clip_type="both" ;; esac ]] ) ] )# AC_C_CLIP_MODE ifelse(dnl Do not edit or modify anything in this comment block. The arch-tag line is a file identity tag for the GNU Arch revision control system. arch-tag: 6db7c287-8971-4074-a193-468446194fd0 )dnl