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Building Tremor with gcc 4.0 identified this possible flaw (and the Tremor svn repo seems to still have it done this way). This change was just committed in the Rockbox project's CVS tree. (There doesn't seem to be any component in the bug tracker for Tremor so I set it to libvorbis...)

--- sharedbook.c        28 Feb 2005 20:55:30 -0000      1.2
+++ sharedbook.c        7 Jul 2005 08:23:21 -0000       1.3
@@ -211,7 +211,7 @@
          int indexdiv=1;
          for(k=0;k<b->dim;k++){
            int index= (j/indexdiv)%quantvals;
-           int point;
+           int point=0;
            int val=VFLOAT_MULTI(delta,delpoint,
                                 abs(b->quantlist[index]),&point);

@@ -245,7 +245,7 @@
          int         lastpoint=0;

          for(k=0;k<b->dim;k++){
-           int point;
+           int point=0;
            int val=VFLOAT_MULTI(delta,delpoint,
                                 abs(b->quantlist[j*b->dim+k]),&point);