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From "Martin Sebor (JIRA)" <j...@apache.org>
Subject [jira] Created: (STDCXX-350) [gcc 4.1.1] -O2 warning: std::temporary_buffer dereferences type-punned pointer
Date Thu, 08 Mar 2007 01:49:24 GMT
[gcc 4.1.1] -O2 warning: std::temporary_buffer dereferences type-punned pointer
-------------------------------------------------------------------------------

                 Key: STDCXX-350
                 URL: https://issues.apache.org/jira/browse/STDCXX-350
             Project: C++ Standard Library
          Issue Type: Bug
          Components: 20. General Utilities
    Affects Versions: 4.1.3, 4.1.4
         Environment: gcc 4.1.1 -O2, Solaris 10
            Reporter: Martin Sebor


Compiling the following program with gcc 4.1.1 on Solaris 10 produces the warning below:

$ cat t.cpp && gmake -r t
#include <memory>

int main ()
{
    std::get_temporary_buffer<int>(1);
}
gcc -c -I/amd/devco/sebor/stdcxx/include/ansi   -pthreads -I/amd/devco/sebor/stdcxx/include
-I/build/sebor/gcc-4.1.1-12d/include -I/amd/devco/sebor/stdcxx/examples/include  -pedantic
-nostdinc++ -O2  -W -Wall -Wcast-qual -Winline -Wshadow -Wwrite-strings -Wno-long-long   t.cpp
/amd/devco/sebor/stdcxx/include/rw/_rawiter.h: In function 'std::pair<_TypeT*, _Distance>
std::get_temporary_buffer(_Distance, _TypeT*) [with _TypeT = int, _Distance = int]':
/amd/devco/sebor/stdcxx/include/rw/_rawiter.h:146:   instantiated from 'std::pair<_TypeT*,
int> std::get_temporary_buffer(int) [with _TypeT = int]'
t.cpp:5:   instantiated from here
/amd/devco/sebor/stdcxx/include/rw/_rawiter.h:131: warning: dereferencing type-punned pointer
will break strict-aliasing rules
gcc t.o -o t -pthreads -L/build/sebor/gcc-4.1.1-12d/lib -lstd12d  -Wl,-R/build/sebor/gcc-4.1.1-12d/lib
-lsupc++ -lm 
rm t.o


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