I tried from Ubuntu in Virtualbox and this is the error I now get and it appears to be similar to the error from Cygwin. Configure seems to run fine. Make fails. I'm officially lost.
CC qga/commands-win32.o
qga/commands-win32.c: In function ‘qmp_guest_set_user_password’:
qga/commands-win32.c:1254:5: warning: passing argument 2 of ‘g_base64_decode’ from incompatible pointer type [enabled by default]
rawpasswddata = (char *)g_base64_decode(password, &rawpasswdlen);
^
In file included from /usr/include/glib-2.0/glib.h:35:0,
from qga/commands-win32.c:14:
/usr/include/glib-2.0/glib/gbase64.h:52:9: note: expected ‘gsize *’ but argument is of type ‘size_t *’
guchar *g_base64_decode (const gchar *text,
^
CC qga/channel-win32.o
qga/channel-win32.c: In function ‘ga_channel_create_watch’:
qga/channel-win32.c:199:24: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
watch->pollfd.fd = (gintptr) c->rstate.ov.hEvent;
^
qga/channel-win32.c: At top level:
qga/channel-win32.c:205:11: error: conflicting types for ‘ga_channel_read’
GIOStatus ga_channel_read(GAChannel *c, char *buf, size_t size, gsize *count)
^
In file included from qga/channel-win32.c:9:0:
./qga/channel.h:30:11: note: previous declaration of ‘ga_channel_read’ was here
GIOStatus ga_channel_read(GAChannel *c, gchar *buf, gsize size, gsize *count);
^
qga/channel-win32.c:269:11: error: conflicting types for ‘ga_channel_write_all’
GIOStatus ga_channel_write_all(GAChannel *c, const char *buf, size_t size)
^
In file included from qga/channel-win32.c:9:0:
./qga/channel.h:31:11: note: previous declaration of ‘ga_channel_write_all’ was here
GIOStatus ga_channel_write_all(GAChannel *c, const gchar *buf, gsize size);
^
qga/channel-win32.c: In function ‘ga_channel_open’:
qga/channel-win32.c:291:19: error: ‘MAXPATHLEN’ undeclared (first use in this function)
gchar newpath[MAXPATHLEN] = {0};
^
qga/channel-win32.c:291:19: note: each undeclared identifier is reported only once for each function it appears in
qga/channel-win32.c:291:11: warning: unused variable ‘newpath’ [-Wunused-variable]
gchar newpath[MAXPATHLEN] = {0};
^
make: *** [qga/channel-win32.o] Error 1