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Date: Thu, 18 Oct 2007 08:21:50 -0700 (PDT)
From: "Martin Sebor (JIRA)" <jira@apache.org>
To: stdcxx-dev@incubator.apache.org
Subject: [jira] Commented: (STDCXX-162) [x86_64] atomic operations disabled
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    [ https://issues.apache.org/jira/browse/STDCXX-162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12535937 ] 

Martin Sebor commented on STDCXX-162:
-------------------------------------

As noted in the following thread:
http://www.nabble.com/stdcxx-4.2.0-4.1.3-binary-incompatibility-on-Linux-tf4642037.html
the fix for this issue (http://svn.apache.org/viewcvs?view=rev&rev=383659) introduces a binary incompatibility on Linux/x86_64.

> [x86_64] atomic operations disabled
> -----------------------------------
>
>                 Key: STDCXX-162
>                 URL: https://issues.apache.org/jira/browse/STDCXX-162
>             Project: C++ Standard Library
>          Issue Type: Improvement
>          Components: Configuration
>    Affects Versions: 4.1.3
>         Environment: x86_64
>            Reporter: Martin Sebor
>            Priority: Critical
>             Fix For: 4.2
>
>
> Atomic operations are disabled on AMD64 and EM64T.
> $ uname -srp && cat t.cpp && make t && LD_LIBRARY_PATH=../lib:$LD_LIBRARY_PATH ./t
> Linux 2.6.9-22.ELsmp x86_64
> #include <cassert>
> #include <string>
> #include <pthread.h>
> int main ()
> {
>     typedef std::char_traits<char>                      Traits;
>     typedef std::allocator<char>                        Allocator;
>     typedef __rw::__string_ref<char, Traits, Allocator> strref;
>     struct SmallRef {
>         int                    ref_count;
>         std::string::size_type capacity;
>         std::string::size_type size;
>     };
>     struct LargeRef {
>         pthread_mutex_t        mutex;
>         int                    ref_count;
>         std::string::size_type capacity;
>         std::string::size_type size;
>     };
>     assert (sizeof (strref) <= sizeof (SmallRef));
>     assert (sizeof (strref) <  sizeof (LargeRef));
> }
> gcc -c -I/build/sebor/dev/stdlib/include/ansi -D_RWSTDDEBUG   -pthread -D_RWSTD_USE_CONFIG -I/build/sebor/gcc-3.4.4-15D/include -I/build/sebor/dev/stdlib/include -I/build/sebor/dev/stdlib/../rwtest -I/build/sebor/dev/stdlib/../rwtest/include -I/build/sebor/dev/stdlib/tests/include  -pedantic -nostdinc++ -g  -Wall -W -Wcast-qual -Winline -Wshadow -Wwrite-strings -Wno-long-long -Wcast-align  t.cpp
> gcc t.o -o t -L/build/sebor/gcc-3.4.4-15D/rwtest -lrwtest15d -pthread -L/build/sebor/gcc-3.4.4-15D/lib -lstd15d  -lsupc++ -lm
> t: t.cpp:24: int main(): Assertion `sizeof (strref) <= sizeof (SmallRef)' failed.
> Aborted

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