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Re: gcc 4.0 begins complaining of "redefinition of typedef 'foo'
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Re: gcc 4.0 begins complaining of "redefinition of typedef 'foo'


  • Subject: Re: gcc 4.0 begins complaining of "redefinition of typedef 'foo'
  • From: "Karan, Cem (Civ, ARL/CISD)" <email@hidden>
  • Date: Wed, 15 Jun 2005 10:51:18 -0400
  • Thread-topic: Xcode-users Digest, Vol 2, Issue 276

What happens if you do a full clean and rebuild?

Cem Karan

------------------------------

Message: 11
Date: Wed, 15 Jun 2005 09:25:07 -0500
From: Bill Monk <email@hidden>
Subject: gcc 4.0 begins complaining of "redefinition of typedef 'foo'
To: email@hidden
Message-ID: <email@hidden>
Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed

So XCode 2.1/gcc 4.0 has been happily building a codebase which uses
"#pragma once" in all its headers.

Suddenly today, building the project produces reams of these errors:

"in file included from /path/foo.h
error: redefinition of typedef 'bar'
previous declaration was here"          (where "here" points to
header foo.h)


Well, hmm, that looks what you'd see for headers being included more
than once.

Seems that I recall some older versions of gcc didn't support #pragma
once. Of course, the project has been building just fine with them,
but just for grins I turned on warnings for unknown pragmas...however
no complaints. for that.


If I remove the supposedly offending inclusion of foo.h, the
complaints, unsurprisingly, change to

error: parse error before 'someVariableName'
warning: data definition has no type or storage class


So suddenly XCode 2.1 is giving me a Catch 22. Ideas?
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