Bug 53858 – gcc warns on function prototype with incomplete type

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Bug 53858 - gcc warns on function prototype with incomplete type

Summary:	gcc warns on function prototype with incomplete type

Status:	CLOSED UPSTREAM

Aliases:	None

Product:	Red Hat Linux
Classification:	Retired
Component:	gcc (Show other bugs)
Sub Component:
Version:	7.1
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Jakub Jelinek
QA Contact:	Brian Brock
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Reported:	2001-09-19 22:31 EDT by Ben LaHaise
Modified:	2007-04-18 12:37 EDT (History)
CC List:	0 users

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Doc Type:	Bug Fix
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Last Closed:	2004-10-07 08:49:29 EDT
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Description Ben LaHaise 2001-09-19 22:31:41 EDT

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 05:34:51 EDT

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 08:49:29 EDT

Tracked upstream: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17881

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