Bug 155641

Summary: Forward reference in extern array reference causes error.
Product: [Fedora] Fedora Reporter: Rusty Scott <rustys>
Component: gcc4Assignee: Jakub Jelinek <jakub>
Status: CLOSED NOTABUG QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: 4   
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Hardware: i686   
OS: Linux   
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2005-04-24 11:24:22 UTC Type: ---
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Description Flags
A simple compile case to demonstrate the issue. none

Description Rusty Scott 2005-04-22 05:08:36 UTC 
Description of problem:
A valid forward reference to a structure in an external reference is errored by
gcc4.

Version-Release number of selected component (if applicable):
gcc version 4.0.0 20050405 (Red Hat 4.0.0-0.40)

How reproducible:
always

Steps to Reproduce:
1. get test_code.c (from attachment)
2. gcc test_code.c
3.
  
Actual results:
test_code.c:7: error: array type has incomplete element type

Expected results:
This hasn't ever been an error before, I'm not aware of any specification
changes to the way forward references work.

Additional info:
Comment 1 Rusty Scott 2005-04-22 05:08:36 UTC 
Created attachment 113510 [details]
A simple compile case to demonstrate the issue.
Comment 2 Jakub Jelinek 2005-04-24 11:24:22 UTC 
This is not a bug.  Your testcase is not valid ISO C.  See ISO C99, 6.7.5.2 Array
declarators: The element type shall not be an incomplete or function type.
Older GCC's issued a pedantic warning (resp. error with -pedantic-errors), in
GCC 4.0.x and later this error is unconditional.