android NDK complains std::nearbyint is not a member of std

Question

I want use std::nearbyint in android gcc but then ndk complains that std::nearbyint is not a member of std. I have the cmath header included in my code & the same builds well for OSX.

Is there a workaround for this ? Is possible to write my own version of std::nearbyint ? I am using NDK14b on android

solution to your problem is already in stackoverflow- http://stackoverflow.com/questions/22774009/android-ndk-stdto-string-support — Ansh Chugh, May 02 '17 at 13:34
I am using Qt & building with .pro files & qmake. need to figure how to add the compiler flags mentioned in http://stackoverflow.com/questions/22774009/android-ndk-stdto-string-support to my .pro files for Qmake. — TheWaterProgrammer, May 02 '17 at 13:53
@McLOVIN: add `CONFIG += c++11` in your .pro file, you can also use [qRound](http://doc.qt.io/qt-5.8/qtglobal.html#qRound) then, that should work with all Qt versions even without c++11 support. — xander, May 02 '17 at 14:10
@McLOVIN yeah but that is a pretty old source you found there, see my comment for modern way and better readable I guess :) — xander, May 02 '17 at 14:15
is there some way I an implement my own version of `nearbyint` ? — TheWaterProgrammer, May 02 '17 at 14:45

score 1 · Accepted Answer · answered May 02 '17 at 19:01

1

This is part of https://github.com/android-ndk/ndk/issues/82. GNU's libstdc++ is overly broad with their feature guards. We're working on stabilizing the NDK's solution for libc++ so we can just move entirely over to that instead.

answered May 02 '17 at 19:01

Dan Albert

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thanks for the update. it doesn't work for me no matter whatever CXX flags I put. I am using qmake. it might have to do with that. but this is only a problem with android:gcc it seems – TheWaterProgrammer May 02 '17 at 20:02
No cflags/cppflags will affect this. Those feature guards take affect when we build the NDK itself. – Dan Albert May 04 '17 at 00:55
Just tested with latest r17 canary build (as suggested in @dan-albert issue #82), but still got this error. See: https://github.com/nodejs/node/issues/14771 – Arnold Schrijver Aug 11 '17 at 12:27
https://github.com/android-ndk/ndk/issues/82#issuecomment-236979264 (switch to libc++) – Dan Albert Aug 11 '17 at 17:56

android NDK complains std::nearbyint is not a member of std

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