On Thu, 2013-12-12 at 23:20 +0100, rastersoft wrote:
Hi all:
I'm creating a VAPI file for xcb_icccm and I have a problem:
I defined the function xcb_icccm_get_wm_class_from_reply as:
[CCode (cname = "xcb_icccm_get_wm_class_from_reply")]
public void get_wm_class_from_reply(out WmClassFromReply reply,
GetPropertyReply input);
Unfortunately, when I try to compile a program that uses it, I receive
this error:
CMakeFiles/valawm.dir/window.c.o: In function
`vala_wm_vala_window_map_request':
window.c:(.text+0xbca): undefined reference to
`xcb_icccm_wm_class_from_reply_destroy'
window.c:(.text+0xc6e): undefined reference to
`xcb_icccm_wm_class_from_reply_destroy'
collect2: error: ld returned 1 exit status
It seems that Vala presumes that there must be a "destroy" call that
complements the "get" call. But there is no such call.
How can I fix this?
You didn't provide enough information for a definitive answer, but a few possibilities: Vala only defaults to lower_case_cprefix_destroy; if there is a destroy function under some other name, you should use the destroy_function CCode annotation to specify it. If all fields are either unowned, simpletype structs, or structs which conform to the aforementioned constraints, vala should not generate a call to a destroy function. If you're not supposed to call a function to destroy the struct at the C level but vala is generating one, odds are good there is an error in the ownership of the fields in your vapi. If the memory is managed elsewhere, make the out parameter unowned. -Evan
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