Bug 53858 - gcc warns on function prototype with incomplete type
Summary: gcc warns on function prototype with incomplete type
Status: CLOSED UPSTREAM
Alias: None
Product: Red Hat Linux
Classification: Retired
Component: gcc   
(Show other bugs)
Version: 7.1
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Jakub Jelinek
QA Contact: Brian Brock
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Blocks:
TreeView+ depends on / blocked
 
Reported: 2001-09-20 02:31 UTC by Ben LaHaise
Modified: 2007-04-18 16:37 UTC (History)
0 users

Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2004-10-07 12:49:29 UTC
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Description Ben LaHaise 2001-09-20 02:31:41 UTC 
Compiling the below program produces a warning when it should not.  This
bug is also present in the gcc3 package.  Cheers!

[bcrl@toomuch ~]$ gcc -Wall -o /dev/null gcc-warning.c 
gcc-warning.c:4: warning: parameter has incomplete type

... gcc-warning.c ...
struct iocb;
struct foo {
	void (*bar)(struct iocb);
};
Comment 1 Jakub Jelinek 2001-09-24 09:34:51 UTC 
It is true that ISO C99 allows incomplete types in function prototypes, on the
other side I don't think it forbids such a warning. I'll ask Joseph what he
thinks about it.
Comment 2 Jakub Jelinek 2004-10-07 12:49:29 UTC 
Tracked upstream: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17881
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