Accessing fontconfig objs in gdb

[Julien Nabet]

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?

Julien
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