Thanks for your reply, kefu:-) I checked /opt/rh/devtoolset-7/root/usr/include/c++/7/x86_64-redhat-linux/bits/c++config.h, and saw the following configuration: # define _GLIBCXX_USE_DUAL_ABI 0 #if ! _GLIBCXX_USE_DUAL_ABI // Ignore any pre-defined value of _GLIBCXX_USE_CXX11_ABI # undef _GLIBCXX_USE_CXX11_ABI #endif #ifndef _GLIBCXX_USE_CXX11_ABI # define _GLIBCXX_USE_CXX11_ABI 0 #endif It seems that no matter how we config MAKEFILE or CMakeFile, _GLIBCXX_USE_CXX11_ABI would always be 0 under the circumstance. So I think https://github.com/ceph/ceph/pull/18755 is still needed. Is this right? On 26 December 2017 at 00:38, kefu chai <tchaikov@xxxxxxxxx> wrote: > On Mon, Dec 25, 2017 at 10:43 PM, kefu chai <tchaikov@xxxxxxxxx> wrote: >> On Sat, Dec 23, 2017 at 5:46 PM, Xuehan Xu <xxhdx1985126@xxxxxxxxx> wrote: >>> Hi, everyone. >>> >>> I'm using CentOS 7 with devtoolset-7 to build ceph. However, I found >>> that the list::size() in my ceph executables is still counting the >>> number of nodes. It's so odd, I googled it, and found that this may >>> have something to do with _GLIBCXX_USE_CXX11_ABI. But even if I >>> explicitly set _GLIBCXX_USE_CXX11_ABI to 1 when building ceph, the >>> problem remains. It seems that _GLIBCXX_USE_CXX11_ABI is set to 0 by >>> gcc no matter how I build the source code, even with >>> -D_GLIBCXX_USE_CXX11_ABI=1. >> >> Xuehan, thanks for testing! >> >> turns out the gcc-7 in devtoolset is compiled with >> "--with-default-libstdcxx-abi=gcc4-compatible", see the output of "g++ >> -v", so it is using "_GLIBCXX_USE_CXX11_ABI=0", you can by checking >> /opt/rh/devtoolset-7/root/usr/include/c++/7/x86_64-redhat-linux/bits/c++config.h >> . >> >> in other words, we still need https://github.com/ceph/ceph/pull/18755. > > > hmm, probably not. > > add_definitions(-D_GLIBCXX_USE_CXX11_ABI=1) > > and > > set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fabi-version=0") > > might help. I will give it a try tomorrow. > > > > -- > Regards > Kefu Chai -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
