Accessing fontconfig objs in gdb

[Ilmari Lauhakangas]

On 10.9.2024 14.01, Julien Nabet wrote:
> Hello,
> 
> I'm trying to understand fontconfig use in LO for tdf#108243 (semicolon 
> separated fonts substitution not working (bug in Linux FontConfig 
> integration code)
> 
> On gdb, I got this:
> 
> (gdb) p pPattern
> $1 = (FcPattern *) 0x55555c030800
> (gdb) p *pPattern
> $2 = <incomplete type>
> 
> whereas I rebuilt fontconfig after having done:
> 
> 1) adding --without-system-fontconfig in autogen.input
> 
> 2) using this:
> 
> diff --git a/external/fontconfig/ExternalProject_fontconfig.mk 
> b/external/fontconfig/ExternalProject_fontconfig.mk
> index 0d899ef129bd..7ecd8353c154 100644
> --- a/external/fontconfig/ExternalProject_fontconfig.mk
> +++ b/external/fontconfig/ExternalProject_fontconfig.mk
> @@ -31,6 +31,7 @@ $(call 
> gb_ExternalProject_get_state_target,fontconfig,build) :
>                          $(if $(filter EMSCRIPTEN,$(OS)),-pthread)" \
>                          $(if $(filter ANDROID,$(OS)),LIBS="-lm") \
>                  $(if $(filter 
> EMSCRIPTEN,$(OS)),LIBXML2_CFLAGS="$(LIBXML_CFLAGS)" 
> LIBXML2_LIBS="$(LIBXML_LIBS)") \
> +               $(if $(filter TRUE,$(ENABLE_DBGUTIL)),debug=true) \
>                  $(gb_RUN_CONFIGURE) ./configure \
>                          --disable-silent-rules \
>                          --with-pic \
> 
> What should I do to teach gdb to display fontconfig objs?

Can you install the debug package for fontconfig in your Linux distro?

Ilmari