* support for simple_idct config

* preserving timestamp if config.h is not modifed

Originally committed as revision 395 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -3,22 +3,26 @@
 TMPC="ffmpeg-conf-${RANDOM}-$$-${RANDOM}.c"
 TMPO="ffmpeg-conf-${RANDOM}-$$-${RANDOM}.o"
 TMPS="ffmpeg-conf-${RANDOM}-$$-${RANDOM}.S"
+TMPH="ffmpeg-conf-${RANDOM}-$$-${RANDOM}.h"
 
 if [ ! -z "$TMPDIR" ]; then
 	TMPC="${TMPDIR}/${TMPC}"
 	TMPCPP="${TMPDIR}/${TMPCPP}"
 	TMPO="${TMPDIR}/${TMPO}"
 	TMPS="${TMPDIR}/${TMPS}"
+	TMPH="${TMPDIR}/${TMPH}"
 elif [ ! -z "$TEMPDIR" ]; then
 	TMPC="${TEMPDIR}/${TMPC}"
 	TMPCPP="${TEMPDIR}/${TMPCPP}"
 	TMPO="${TEMPDIR}/${TMPO}"
 	TMPS="${TEMPDIR}/${TMPS}"
+	TMPH="${TEMPDIR}/${TMPH}"
 else
 	TMPC="/tmp/${TMPC}"
 	TMPCPP="/tmp/${TMPCPP}"
 	TMPO="/tmp/${TMPO}"
 	TMPS="/tmp/${TMPS}"
+	TMPH="/tmp/${TMPH}"
 fi
 
 # default parameters
@@ -82,6 +86,7 @@ echo "  --cpu=CPU               force cpu to CPU  [$cpu]"
 echo "  --disable-mmx           disable mmx usage"
 echo "  --enable-gprof          enable profiling with gprof [$gprof]"
 echo "  --disable-grab          disable audio/video grabbing code"
+echo "  --enable-simple_idct	use simple IDCT routines"
 echo "  --enable-mp3lame        enable mp3 encoding via libmp3lame"
 echo "  --enable-win32          enable win32 cross compile"
 echo "  --enable-shared         build shared libraries [default=no]"
@@ -105,6 +110,8 @@ for opt do
   ;;
   --enable-mp3lame) mp3lame="yes"
   ;;
+  --enable-simple_idct) simpleidct="yes"
+  ;;
   --enable-win32) win32="yes"
   ;;
   --enable-shared=*) lshared=`echo $opt | cut -d '=' -f 2`
@@ -160,7 +167,7 @@ echo "mp3lame enabled  $mp3lame"
 echo "Creating config.mak and config.h"
 
 echo "# Automatically generated by configure - do not modify" > config.mak
-echo "/* Automatically generated by configure - do not modify */" > config.h
+echo "/* Automatically generated by configure - do not modify */" > $TMPH
 
 echo "prefix=$prefix" >> config.mak
 echo "MAKE=make" >> config.mak
@@ -169,23 +176,23 @@ echo "AR=$ar" >> config.mak
 echo "OPTFLAGS=$CFLAGS" >> config.mak
 if [ "$cpu" = "x86" ] ; then
   echo "TARGET_ARCH_X86=yes" >> config.mak
-  echo "#define ARCH_X86 1" >> config.h
+  echo "#define ARCH_X86 1" >> $TMPH
 fi
 if [ "$cpu" = "armv4l" ]; then
   echo "TARGET_ARCH_ARMV4L=yes" >> config.mak
-  echo "#define ARCH_ARMV4L 1" >> config.h
+  echo "#define ARCH_ARMV4L 1" >> $TMPH
 fi
 if [ "$cpu" = "alpha" ]; then
   echo "TARGET_ARCH_ALPHA=yes" >> config.mak
-  echo "#define ARCH_ALPHA 1" >> config.h
+  echo "#define ARCH_ALPHA 1" >> $TMPH
 fi
 if [ "$mmx" = "yes" ] ; then
   echo "TARGET_MMX=yes" >> config.mak
-  echo "#define HAVE_MMX 1" >> config.h
+  echo "#define HAVE_MMX 1" >> $TMPH
 fi
 if [ "$gprof" = "yes" ] ; then
   echo "TARGET_GPROF=yes" >> config.mak
-  echo "#define HAVE_GPROF 1" >> config.h
+  echo "#define HAVE_GPROF 1" >> $TMPH
 fi
 if [ "$lshared" = "yes" ] ; then
   echo "BUILD_SHARED=yes" >> config.mak
@@ -197,43 +204,54 @@ echo -n "VERSION=" >>config.mak
 head VERSION >>config.mak
 echo "" >>config.mak
 # if you do not want to use encoders, disable that.
-echo "#define CONFIG_ENCODERS 1" >> config.h
+echo "#define CONFIG_ENCODERS 1" >> $TMPH
 echo "CONFIG_ENCODERS=yes" >> config.mak
 
 # if you do not want to use decoders, disable that.
-echo "#define CONFIG_DECODERS 1" >> config.h
+echo "#define CONFIG_DECODERS 1" >> $TMPH
 echo "CONFIG_DECODERS=yes" >> config.mak
 
 # special AC3 stuff in case you already have it
 # without libavcodec.
-echo "#define CONFIG_AC3 1" >> config.h
+echo "#define CONFIG_AC3 1" >> $TMPH
 echo "CONFIG_AC3=yes" >> config.mak
 
 if [ "$grab" = "yes" ] ; then
-  echo "#define CONFIG_GRAB 1" >> config.h
+  echo "#define CONFIG_GRAB 1" >> $TMPH
   echo "CONFIG_GRAB=yes" >> config.mak
 fi
 
 if [ "$mp3lame" = "yes" ] ; then
-  echo "#define CONFIG_MP3LAME 1" >> config.h
+  echo "#define CONFIG_MP3LAME 1" >> $TMPH
   echo "CONFIG_MP3LAME=yes" >> config.mak
 fi
 
 if [ "$win32" = "yes" ] ; then
-  echo "#define CONFIG_WIN32 1" >> config.h
+  echo "#define CONFIG_WIN32 1" >> $TMPH
   echo "CONFIG_WIN32=yes" >> config.mak
 fi
 
 if [ "$_malloc_h" = "yes" ]; then
-  echo "#define HAVE_MALLOC_H 1" >> config.h
+  echo "#define HAVE_MALLOC_H 1" >> $TMPH
 else
-  echo "#undef  HAVE_MALLOC_H" >> config.h
+  echo "#undef  HAVE_MALLOC_H" >> $TMPH
 fi
 
 if [ "$_memalign" = "yes" ]; then
-  echo "#define HAVE_MEMALIGN 1" >> config.h
+  echo "#define HAVE_MEMALIGN 1" >> $TMPH
+else
+  echo "#undef  HAVE_MEMALIGN" >> $TMPH
+fi
+
+if [ "$simpleidct" = "yes" ]; then
+  echo "#define SIMPLE_IDCT 1" >> $TMPH
+fi
+
+diff -q $TMPH config.h >/dev/null
+if test $? -ne 0 ; then
+	mv -f $TMPH config.h
 else
-  echo "#undef  HAVE_MEMALIGN" >> config.h
+	echo "config.h is unchanged"
 fi
 
-rm -f $TMPO $TMPC $TMPS
+rm -f $TMPO $TMPC $TMPS $TMPH