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[Bob Gustafson <bobgus@xxxxxxx>]

The diagnostics below were from a static analysis using scan-build on my 
Mac.

They might be useful.

/private/tmp/kicad-PZ3oZb/wx/src/regex/regcomp.c:339:19: warning: Result 
of 'malloc' is converted to a pointer of type 'char', which is 
incompatible with sizeof operand type 'struct guts'
        re->re_guts = VS(MALLOC(sizeof(struct guts)));
                      ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/private/tmp/kicad-PZ3oZb/wx/src/regex/regguts.h:96:19: note: expanded 
from macro 'MALLOC'
#define MALLOC(n)       malloc(n)
                        ^~~~~~
/private/tmp/kicad-PZ3oZb/wx/src/regex/regguts.h:74:24: note: expanded 
from macro 'VS'
#define VS(x)   ((PVOID)(x))            /* cast something to generic ptr */
                         ^
/private/tmp/kicad-PZ3oZb/wx/src/regex/regcomp.c:1633:11: warning: 
Access to field 'chrs' results in a dereference of a null pointer 
(loaded from variable 'leads')
        for (p = leads->chrs, i = leads->nchrs; i > 0; p++, i--) {
                 ^~~~~~~~~~~
In file included from /private/tmp/kicad-PZ3oZb/wx/src/regex/regcomp.c:2176:
/private/tmp/kicad-PZ3oZb/wx/src/regex/regc_color.c:472:22: warning: 
Result of 'malloc' is converted to a pointer of type 'union tree', which 
is incompatible with sizeof operand type 'struct ptrs'
                        t = (union tree *)MALLOC(sizeof(struct ptrs));
                             ~~~~~~~~~~~~ ^~~~~~~~~~~~~~~~~~~~~~~~~~~
/private/tmp/kicad-PZ3oZb/wx/src/regex/regguts.h:96:19: note: expanded 
from macro 'MALLOC'
#define MALLOC(n)       malloc(n)
                        ^~~~~~
In file included from /private/tmp/kicad-PZ3oZb/wx/src/regex/regcomp.c:2176:
/private/tmp/kicad-PZ3oZb/wx/src/regex/regc_color.c:491:22: warning: 
Result of 'malloc' is converted to a pointer of type 'union tree', which 
is incompatible with sizeof operand type 'struct colors'
                        t = (union tree *)MALLOC(sizeof(struct colors));
                             ~~~~~~~~~~~~ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/private/tmp/kicad-PZ3oZb/wx/src/regex/regguts.h:96:19: note: expanded 
from macro 'MALLOC'
#define MALLOC(n)       malloc(n)
                        ^~~~~~
In file included from /private/tmp/kicad-PZ3oZb/wx/src/regex/regcomp.c:2177:
/private/tmp/kicad-PZ3oZb/wx/src/regex/regc_nfa.c:374:15: warning: 
Access to field 'outchain' results in a dereference of a null pointer 
(loaded from variable 'a')
                a->outchain = victim->outchain;
                ~           ^
/private/tmp/kicad-PZ3oZb/wx/src/regex/regc_nfa.c:388:14: warning: 
Access to field 'inchain' results in a dereference of a null pointer 
(loaded from variable 'a')
                a->inchain = victim->inchain;
                ~          ^
/private/tmp/kicad-PZ3oZb/wx/src/regex/regc_nfa.c:1241:33: warning: Call 
to 'malloc' has an allocation size of 0 bytes
        cnfa->states = (struct carc **)MALLOC(nstates * sizeof(struct 
carc *));
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/private/tmp/kicad-PZ3oZb/wx/src/regex/regguts.h:96:19: note: expanded 
from macro 'MALLOC'
#define MALLOC(n)       malloc(n)
                        ^~~~~~~~~
7 warnings generated.