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[Bug ld/4844] New: auto-import and const data import problem
From: |
ralf dot habacker at freenet dot de |
Subject: |
[Bug ld/4844] New: auto-import and const data import problem |
Date: |
26 Jul 2007 06:27:41 -0000 |
Hi,
mingw and cygwin ld has a feature called auto-import, which allows to import
data symbols without any dllexport/dlimport decoration. While this feature works
for many cases importing const data with gcc >= 4 fails.
A description of the problem could be found here
http://www.cygwin.com/ml/cygwin/2004-09/msg01101.html
In http://cygwin.com/ml/cygwin/2007-07/msg00470.html there are two solutions
described.
As you can see from Chuck's message it's kind of a hairy situation in
that there is no "real" fix for it other than undoing the optimization
of placing these in a readonly section. That can be accomplished by
either using a modified linker script or by removing the 'const' from
the declaration. The former is a sort of brute force/last ditch
approach which is useful if you have a very large code base with lots of
modules and you can't or don't want to hunt down the offending structs.
I think the qt project had to take this approach:
<http://www.cygwin.com/ml/cygwin/2004-10/msg01052.html>
Because this problem seems to hit many people the question is if this linker
script could be integrated in ld and automatically used for linking in case
auto-import is enabled.
--
Summary: auto-import and const data import problem
Product: binutils
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: ld
AssignedTo: unassigned at sources dot redhat dot com
ReportedBy: ralf dot habacker at freenet dot de
CC: bug-binutils at gnu dot org,ralf dot habacker at freenet
dot de
http://sourceware.org/bugzilla/show_bug.cgi?id=4844
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