Re: [Boost-users] boost::lockfree::queue not working with -fgnu-tm

Subject: Re: [Boost-users] boost::lockfree::queue not working with -fgnu-tm
From: Philipp Schoppe (philipp.schoppe_at_[hidden])
Date: 2014-07-16 05:22:06

The problem seems to be the combination of -fgnu-tm and any -O flag.
It doesn't compile for -O1 or -O2, as well. -O0 works. Can you confirm
that? Has anybody ever experienced this before and knows a workaround?
Maybe I should open a bug report.

On 07/15/2014 11:47 PM, Angelo Mondaini wrote:
> I also use Archlinux, I have tested your code.
> Indeed, with all the flags you are trying, gcc can't compile.
> To me, the problem is the flag "-O3", removing it gcc can compile the 
> code, no problem.
> Note that "-O3" are very wild optimizations, it can makes the code 
> slower some times and it can even break the code.
> Careful when using it.
>
> HTH,
> Angelo
>
>
> 2014-07-15 12:09 GMT-03:00 Philipp Schoppe <philipp.schoppe_at_[hidden] 
> <mailto:philipp.schoppe_at_[hidden]>>:
>
>     Hello,
>
>     I try to benchmark different queue implementations. I have a test
>     program
>     which includes the boost lockfree queue and some custom
>     implementations
>     where one is using gcc's STM. In order to compile it, I need to
>     add the -fgnu-tm
>     flag. I am using an up-to-date arch linux system with gcc 4.9.0
>     and boost 1.55.0
>     When adding this flag, I get a compilation error. This is a small
>     example that
>     illustrates the problem:
>
>     errtest.cpp:
>
>     #include <boost/lockfree/queue.hpp>
>
>     int main () {
>
>         boost::lockfree::queue<int> lfqueue;
>         lfqueue.push(234);
>
>         return 0;
>     }
>
>     Compiling it using
>
>     g++ -std=c++11 -lboost_system -g -O3 -Wall -Werror -Wswitch-enum
>       -fgnu-tm errtest.cpp -o test
>
>     leads to an error.
>
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