I just tested out gucharmap in a gentoo chroot. It has xfree86 4.3.0,
fontconfig 2.1, pango 1.2.1; generally the latest releases of everything.
Gucharmap however is giving a segv in FcConfigAdd():
#0 0x42d1d75d in FcConfigAdd (head=0x4, position=0x0, append=1, new=0x8127de0) at
fccfg.c:925
#1 0x42d1cb55 in FcConfigSubstituteWithPat (config=0x80a36c8, p=0x8128ea0,
p_pat=0x81309e8,
kind=FcMatchFont) at fccfg.c:1160
#2 0x42d24bea in FcFontRenderPrepare (config=0x1, pat=0x81309e8, font=0x80a5a40) at
fcmatch.c:439
#3 0x42d24ebd in FcFontSetMatch (config=0x80a36c8, sets=0xbfffbdb8, nsets=1,
p=0x81309e8, result=0xbfffbe08)
at fcmatch.c:520
#4 0x42d2509b in FcFontMatch (config=0x0, p=0x1, result=0x1) at fcmatch.c:542
#5 0x42fb976f in pango_fc_face_describe () from /usr/lib/libpangoxft-1.0.so.0
#6 0x42f87b75 in pango_font_face_describe () from /usr/lib/libpango-1.0.so.0
#7 0x400f616f in style_changed () from /usr/local/gucharmap/lib/libgucharmap.so.1
The segv happens at for for loop below:
static FcBool
FcConfigAdd (FcValueList **head,
FcValueList *position,
FcBool append,
FcValueList *new)
{
FcValueList **prev, *last;
if (append)
{
if (position)
prev = &position->next;
else
for (prev = head; *prev; prev = &(*prev)->next)
;
}
The problem is that head cannot be dereferenced even once, much less
twice.
Given that I cannot convince the program to dump a core, nor do I see
anyway of getting gdb to do so, does anyone have any suggenstions on
tracking down the bug here?
-JimC
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