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Posted to bugs@apr.apache.org by bu...@apache.org on 2007/05/30 11:39:09 UTC
DO NOT REPLY [Bug 42545] New: - apr redefines compiler-internal __attribute__
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Summary: apr redefines compiler-internal __attribute__
Product: APR
Version: 1.2.8
Platform: Other
OS/Version: other
Status: NEW
Severity: major
Priority: P2
Component: APR
AssignedTo: bugs@apr.apache.org
ReportedBy: apaku@gmx.de
Hi,
I didn't get any responses at the dev mailinglist so I'm filing this as bug:
after a long journey and with the help of a kind soul I found that apr.h
contains an error which makes apr unusable with mingw. The problem is
line #59 in apr.h.in, that line redefines __attribute__(__x) to nothing,
however mingw uses __attribute__(__stdcall) when declaring a function
with __stdcall. This creates a problem when trying to link with the apr
library, because the import library contains the wrong symbols, in
particular it has _apr_foo and __im__?apr_foo@@...
Removing that define one can create a proper import library for apr from
the MSVC dll and the .def file by following the instructions found on
http://www.mingw.org/MinGWiki/index.php/MSVC-MinGW-DLL
I don't understand why apr redefines a compiler-internal symbol like
__attribute__.
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DO NOT REPLY [Bug 42545] - apr redefines compiler-internal __attribute__
Posted by bu...@apache.org.
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------- Additional Comments From apaku@gmx.de 2007-06-05 13:49 -------
Ok, I tried and it works perfectly fine. I rebuilt only apr itself using MSVC
and with the steps explained on the MinGW page I could produce an import
library for mingw and build my application :)
Thanks for the help on this.
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DO NOT REPLY [Bug 42545] - apr redefines compiler-internal __attribute__
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------- Additional Comments From wrowe@apache.org 2007-05-31 12:13 -------
Joe - it was apr.hw that initially defined it. The apr_private.h was actually
redundant - apr.h was included first, AFAICT.
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DO NOT REPLY [Bug 42545] - apr redefines compiler-internal __attribute__
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------- Additional Comments From wrowe@apache.org 2007-05-31 14:52 -------
The 0.9 and 1.2 releases I'm rolling today, but there is no need to wait - and
if you can help on this,
http://svn.apache.org/viewvc?view=rev&rev=543219
is the patch you can apply and confirm that all is now well. Sooner the better,
since I'll be rolling within an hour or few.
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DO NOT REPLY [Bug 42545] - apr redefines compiler-internal __attribute__
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------- Additional Comments From apaku@gmx.de 2007-05-30 12:38 -------
I'm not that familiar with internals of gcc/mingw, but I do know that it
supports __stdcall. However AFAIK it internally makes __attribute__(__stdcall)
from that and seemingly at a place that is affected by redefinition.
So in short 1) sounds good and 2) is not necessary, the whole of KDE uses
__declspec and as I said just removing the redefinition of __attribute__ makes
__stdcall also work properly.
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DO NOT REPLY [Bug 42545] - apr redefines compiler-internal __attribute__
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------- Additional Comments From apaku@gmx.de 2007-05-31 15:12 -------
Wow, thats really great (I expected an answer like the next release after the
upcoming ones) :)
Unfortuantely I can't help you check that, because I'm still rebuilding kdelibs
and I don't have a test program at hand (I didn't find this out myself and the
developer who does have the test program is not available atm). The rebuild
will run for another 2 hours or so and only after that I can check wether
kdevelop which uses the apr libs builds.
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DO NOT REPLY [Bug 42545] - apr redefines compiler-internal __attribute__
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------- Additional Comments From wrowe@apache.org 2007-05-30 12:25 -------
It is redefined because it does conflict on some compilers.
However, it's a double-edged issue. 1 - we can remove it contingent on the
compiler being GCC. That's cool.
2 - if the syntax in gcc is __attribute__(__stdcall), then we really should
look at making gcc-specific DECLARE_* family macros using __attribute__ rather
than __declspec, unless you know gcc is happy with both?
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------- Additional Comments From apaku@gmx.de 2007-05-31 14:49 -------
Thanks, which would be the next release that includes this fix?
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DO NOT REPLY [Bug 42545] - apr redefines compiler-internal __attribute__
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jorton@redhat.com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |NEEDINFO
------- Additional Comments From jorton@redhat.com 2007-05-31 02:58 -------
The section in apr.h which undefines __attribute__ is only supposed to take
effect for non-GCC, pre-GCC 2.7 compilers. Isn't that working? It's all for
NeXT systems which APR probably doesn't really work on anyway, so it could just
as well be nuked for the time being.
Or is it really the arch/win32/apr_private.h #define-to-nothing of __attribute__
which is the problem?
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wrowe@apache.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEEDINFO |RESOLVED
Resolution| |FIXED
------- Additional Comments From wrowe@apache.org 2007-05-31 14:39 -------
Fix committed, thanks for the report
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