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

16 Jul 2014


      Yes, same here!
As far as I know, "-O3" or "-O2" tries to optimize the memory usage and
binary size.
However, "-fgnu-tm" also deals with the memory, so, this seems like
compatibility problem with both flags.
Note that gcc manual for "-fgnu-tm" says: "This is an experimental feature
...".
And "-O3" flag includes very aggressive optimizations, sometimes it can
fail by it own.
I think a bug report would be a good option...

HTH,
Angelo


2014-07-16 6:22 GMT-03:00 Philipp Schoppe :
...
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 mailto:philipp.schoppe@cern.ch>:
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 
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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