[Not entirely sure what this is asking.]

Comment #9 of issue #2606.

Another small issue, I didn't find a way to use `cgo -godefs` using this tool (grep'ed
for 'godefs' in goinstall/go cmds and go/build package).

I have a nasty struct in my C bindings:
typedef struct {
    unsigned long        index;
    double               x;
    double               y;
} cairo_glyph_t;

unsigned long is 4 bytes on x86, 8 bytes on x86_64. Also wiki says: "A double
(eight bytes) will be 8-byte aligned on Windows and 4-byte aligned on Linux (8-byte with
-malign-double compile time option)", which is kind of scary.