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Groups > linux.debian.bugs.dist > #1278444

Bug#1125474: libxm4: missing call to FcInit() when using Fontconfig

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On 2026-01-15 03:58:52 +0100, Vincent Lefevre wrote:
> I've added an abort() after the warning in Fontconfig, and I confirm
> that this is obtained via Motif. I've attached the backtrace.
> 
> This happens via the ValidateAndLoadFont call:
> 
> [...]
> #6  0x00007f172b316b89 in FcObjectFromName (name=name@entry=0x7f172b051b24 "encoding") at ./src/fcname.c:110
> No locals.
> #7  0x00007f172b319888 in IA__FcPatternAddString (p=0x55bb07356dc0, object=object@entry=0x7f172b051b24 "encoding", s=0x55bb0731f41
> 0 "iso10646-1") at ./src/fcpat.c:825
> No locals.
> #8  0x00007f172afa4b23 in ValidateAndLoadFont (rend=rend@entry=0x55bb07356d50, display=<optimized out>, display@entry=0x55bb07308550) at ./lib/Xm/XmRenderT.c:2107
> [...]
> 
> and this function is defined in "lib/Xm/XmRenderT.c", and if
> I understand corretly, this is "case XmFONT_IS_XFT:".

The code in ValidateAndLoadFont() is the following:

[...]
                    _XmRendPattern(rend) = FcPatternCreate();
                    if (_XmRendFontName(rend))
                      FcPatternAddString(_XmRendPattern(rend), FC_FAMILY,
                                         (XftChar8 *)_XmRendFontName(rend));
                    if (_XmRendFontFoundry(rend))
                      FcPatternAddString(_XmRendPattern(rend), FC_FOUNDRY,
                                         (XftChar8 *)_XmRendFontFoundry(rend));
                    if (_XmRendFontEncoding(rend))
                      FcPatternAddString(_XmRendPattern(rend), XFT_ENCODING,
                                         (XftChar8 *)_XmRendFontEncoding(rend));
                    if (_XmRendFontStyle(rend))
                      FcPatternAddString(_XmRendPattern(rend), FC_STYLE,
                                         (XftChar8 *)_XmRendFontStyle(rend));
                    if (_XmRendFontSize(rend))
                      FcPatternAddInteger(_XmRendPattern(rend), FC_SIZE,
                                         _XmRendFontSize(rend));
                    if (_XmRendPixelSize(rend))
                      FcPatternAddInteger(_XmRendPattern(rend), FC_PIXEL_SIZE,
                                         _XmRendPixelSize(rend));
                    if (_XmRendFontSlant(rend))
                      FcPatternAddInteger(_XmRendPattern(rend), FC_SLANT,
                                         _XmRendFontSlant(rend));
                    if (_XmRendFontWeight(rend))
                      FcPatternAddInteger(_XmRendPattern(rend), FC_WEIGHT,
                                         _XmRendFontWeight(rend));
                    if (_XmRendFontSpacing(rend))
                      FcPatternAddInteger(_XmRendPattern(rend), FC_SPACING,
                                         _XmRendFontSpacing(rend));
                    p = XftFontMatch(display, 0, _XmRendPattern(rend), &res);
[...]

It is the FcPatternAddString() call with XFT_ENCODING that triggers
the warning on my machine.

Note that XftFontMatch() will internally call XftInit(), which will
call FcInit(), but this occurs after the above FcPatternAddString()
call.

-- 
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / Pascaline project (LIP, ENS-Lyon)

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Bug#1125474: xpdf: Fontconfig warning: using without calling FcInit() Vincent Lefevre <vincent@vinc17.net> - 2026-01-14 13:20 +0100
  Bug#1125474: xpdf: Fontconfig warning: using without calling FcInit() Adam Sampson <ats@offog.org> - 2026-01-14 13:50 +0100
    Bug#1125474: xpdf: Fontconfig warning: using without calling FcInit() Vincent Lefevre <vincent@vinc17.net> - 2026-01-14 14:20 +0100
      Bug#1125474: xpdf: Fontconfig warning: using without calling FcInit() Vincent Lefevre <vincent@vinc17.net> - 2026-01-14 14:20 +0100
      Bug#1125474: xpdf: Fontconfig warning: using without calling FcInit() Vincent Lefevre <vincent@vinc17.net> - 2026-01-15 04:10 +0100
        Bug#1125474: libxm4: missing call to FcInit() when using Fontconfig Vincent Lefevre <vincent@vinc17.net> - 2026-01-15 11:00 +0100
        Bug#1125474: xpdf: Fontconfig warning: using without calling FcInit() Graham Inggs <ginggs@debian.org> - 2026-01-15 11:20 +0100
          Bug#1125474: xpdf: Fontconfig warning: using without calling FcInit() Vincent Lefevre <vincent@vinc17.net> - 2026-01-15 11:50 +0100

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