configure: add datadir variable and write to config.{h,mak}

Originally committed as revision 16791 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -64,6 +64,7 @@ show_help(){
   echo "  --disable-logging        do not log configure debug information"
   echo "  --prefix=PREFIX          install in PREFIX [$prefix]"
   echo "  --bindir=DIR             install binaries in DIR [PREFIX/bin]"
+  echo "  --datadir=DIR            install data files in DIR [PREFIX/share/ffmpeg]"
   echo "  --libdir=DIR             install libs in DIR [PREFIX/lib]"
   echo "  --shlibdir=DIR           install shared libs in DIR [PREFIX/lib]"
   echo "  --incdir=DIR             install includes in DIR [PREFIX/include]"
@@ -264,6 +265,10 @@ tolower(){
     echo "$@" | tr ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz
 }
 
+c_escape(){
+    echo "$*" | sed 's/["\\]/\\\0/g'
+}
+
 set_all(){
     value=$1
     shift
@@ -914,6 +919,7 @@ CMDLINE_SELECT="
 
 PATHS_LIST='
     bindir
+    datadir
     incdir
     libdir
     mandir
@@ -1113,6 +1119,7 @@ logfile="config.err"
 # installation paths
 prefix_default="/usr/local"
 bindir_default='${prefix}/bin'
+datadir_default='${prefix}/share/ffmpeg'
 incdir_default='${prefix}/include'
 libdir_default='${prefix}/lib'
 mandir_default='${prefix}/share/man'
@@ -2258,6 +2265,7 @@ echo "/* Automatically generated by configure - do not modify! */" > $TMPH
 echo "#ifndef FFMPEG_CONFIG_H" >> $TMPH
 echo "#define FFMPEG_CONFIG_H" >> $TMPH
 echo "#define FFMPEG_CONFIGURATION \"$FFMPEG_CONFIGURATION\"" >> $TMPH
+echo "#define FFMPEG_DATADIR \"$(eval c_escape $datadir)\"" >> $TMPH
 
 echo "FFMPEG_CONFIGURATION=$FFMPEG_CONFIGURATION" >> config.mak
 echo "prefix=$prefix" >> config.mak
@@ -2265,6 +2273,7 @@ echo "LIBDIR=\$(DESTDIR)$libdir" >> config.mak
 echo "SHLIBDIR=\$(DESTDIR)$shlibdir" >> config.mak
 echo "INCDIR=\$(DESTDIR)$incdir" >> config.mak
 echo "BINDIR=\$(DESTDIR)$bindir" >> config.mak
+echo "DATADIR=\$(DESTDIR)$datadir" >> config.mak
 echo "MANDIR=\$(DESTDIR)$mandir" >> config.mak
 echo "CC=$cc" >> config.mak
 echo "YASM=$yasmexe" >> config.mak