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c++/7046: wrong template instantiation within #pragma pack(1) context
- From: wuerkner at gmx dot de
- To: gcc-gnats at gcc dot gnu dot org
- Date: 16 Jun 2002 09:49:30 -0000
- Subject: c++/7046: wrong template instantiation within #pragma pack(1) context
- Reply-to: wuerkner at gmx dot de
>Number: 7046
>Category: c++
>Synopsis: wrong template instantiation within #pragma pack(1) context
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: wrong-code
>Submitter-Id: net
>Arrival-Date: Sun Jun 16 02:56:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: Frank Würkner
>Release: gcc 2.95.3
>Organization:
>Environment:
SuSE Linux 7.3 (Kernel 2.4.18)
>Description:
templates that are instantiated within a #pragma pack(1) context, generate code as if they where defined with #pragma pack(1).
The result is, that one can create instantiations (in other compile units) that place class member variables on different memory locations for the SAME template arguments. Thus leeding to obvious data corruption when accessing them from different compile units.
>How-To-Repeat:
Unpack Attachment.
cd gcc_bug
./run.sh (compiles and runs example)
>Fix:
template instantiations should respect the #pragma pack-state of their definition. The current state when beeing instantiated should be irrelevant.
>Release-Note:
>Audit-Trail:
>Unformatted:
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