[MinGW-notify] [ mingw-Bugs-3206265 ] Memory allocation for vector to extend

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Bugs item #3206265, was opened at 2011-03-11 11:17
Message generated for change (Comment added) made by plibardi
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=102435&aid=3206265&group_id=2435

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Category: gcc
Group: None
>Status: Deleted
>Resolution: Works For Me
Priority: 5
Private: No
Submitted By: Paolo Libardi (plibardi)
Assigned to: Nobody/Anonymous (nobody)
Summary: Memory allocation for vector to extend

Initial Comment:
I have a variable of type vector<string>. It contains 2 items and needs to expand as a third item is going to be added.
When it expands it overwrites memory of another variable.
Error tracking:
src/Pilot.cpp: line 181
src/UtString.cpp: line 36
push_back on line 36 requires vector to expand and this operation deletes value of text_ variable

- O.S.: Windows 7 starter
- IDE: Code::Blocks - Nigthly build 7017 - 20110220

>gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=c:/mingw/bin/../libexec/gcc/mingw32/4.5.2/lto-wrapper.exe
Target: mingw32
Configured with: ../gcc-4.5.2/configure --enable-languages=c,c++,ada,fortran,obj
c,obj-c++ --disable-sjlj-exceptions --with-dwarf2 --enable-shared --enable-libgo
mp --disable-win32-registry --enable-libstdcxx-debug --enable-version-specific-r
untime-libs --disable-werror --build=mingw32 --prefix=/mingw
Thread model: win32
gcc version 4.5.2 (GCC)

>ld -v
GNU ld (GNU Binutils) 2.21

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>Comment By: Paolo Libardi (plibardi)
Date: 2011-03-11 22:52

Message:
It's not a MinGW bug.
Application error is due to parameter passed to function: first parameter
is the address of a vector item, thus as the vector requires to expand it's
moved to a new memory location and all the content is copied to new memory
address.
Old memory address is changed, maybe through a swap instruction to
optimize the expansion of the vector.

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Comment By: Paolo Libardi (plibardi)
Date: 2011-03-11 22:52

Message:
Not a MinGW bug.

Although your problem may be interesting and causing you problems you wish
answers to, it is not a problem with the MinGW runtime, 
w32api, GCC, binutils or msys.  Your BUG report has therefore been
deleted.  If you feel that this needs further discussion then 
please post to min...@li....

Thanks for your interest in the MinGW Project,
MinGW Project Administrators

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=102435&aid=3206265&group_id=2435