The program below built on the target with the MACHINE=beaglebone
gcc-4.9.1 compiler from Yocto/OpenEmbedded poky master produces this error:
beaglebone[52]$ g++ -std=c++1y -pthread test.cc && ./a.out
starting
joining
pure virtual method called
terminate called without an active exception
Aborted (core dumped)
When the program is recompiled with the defines for
__GCC_HAVE_SYNC_COMPARE_AND_SWAP_X enabled as suggested at
https://groups.google.com/d/msg/automatak-dnp3/Jisp_zGhd5I/ck_Cj6nO8joJ
it works:
beaglebone[53]$ g++ -std=c++1y -pthread test.cc && ./a.out
starting
joining
doit
done
Preliminary analysis confirms that the built-ins for those defines are
not being added by the compiler because it thinks the target doesn't
support those operations. Nonetheless, it doesn't use the substitutes
that are obviously available.
Can anybody recall anything about the way GCC is built under OE that
would explain this?
Peter
/* g++ -std=c++1y -pthread test.cc && ./a.out */
#if 0
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_1
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8
#endif
#include <iostream>
#include <thread>
void
doit ()
{
std::cerr << "doit\n";
}
int main (int argc,
char * argv [])
{
std::cerr << "starting\n";
std::thread thr{doit};
std::cerr << "joining\n";
thr.join();
std::cerr << "done\n";
return 0;
}
--
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