olk opened a new issue #17156: failing C++14 compilation for mxnet 1.5.1 URL: https://github.com/apache/incubator-mxnet/issues/17156 ## Description mxnet compiled with USE_CXX14_IF_AVAILABLE=ON forced compilation error in DMLC. ### Error Message ``` /home/graemer/.cache/yay/mxnet-git/src/mxnet-git/include/dmlc/thread_group.h:77:26: Fehler: »shared_timed_mutex« in Namensbereich »std« bezeichnet keinen Typ 77 | using SharedMutex = c; | ^~~~~~~~~~~~~~~~~~ /home/graemer/.cache/yay/mxnet-git/src/mxnet-git/include/dmlc/thread_group.h:77:21: Anmerkung: »std::shared_timed_mutex« ist erst ab C++14 verfügbar 77 | using SharedMutex = std::shared_timed_mutex; ``` I guess that -std=C++14 isn't correctly passed to DMLC because file thread_group.h includes C++1 features (like std::shared_timed_mutex) only if DMLC_USE_CXX14 is defined or __cplusplus > 201103L I think that __cplusplus > 201103L is misleading because only 201402L does identify C++14. ## Environment We recommend using our script for collecting the diagnositc information. Run the following command and paste the outputs below: ```----------Python Info---------- Version : 3.8.0 Compiler : GCC 9.2.0 Build : ('default', 'Oct 23 2019 18:51:26') Arch : ('64bit', 'ELF') ------------Pip Info----------- Version : 19.2.3 Directory : /usr/lib/python3.8/site-packages/pip ----------MXNet Info----------- Version : 1.6.0 Directory : /usr/lib/python3.8/site-packages/mxnet Num GPUs : 2 Hashtag not found. Not installed from pre-built package. ----------System Info---------- Platform : Linux-5.4.3-arch1-1-x86_64-with-glibc2.2.5 system : Linux node : e5lx release : 5.4.3-arch1-1 version : #1 SMP PREEMPT Fri, 13 Dec 2019 09:39:02 +0000 ```
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