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I tried to use std::function in my project, having read here and there that C++ 11 is quite well supported. However simply using std::function makes the build fail:

[armeabi] Compile++ thumb: MyAppNative <= MyAppNative.cpp
jni/MyAppNative.cpp: In function 'jint JNI_OnLoad(JavaVM*, void*)':
jni/MyAppNative.cpp:7:2: error: 'function' is not a member of 'std'
  std::function<void()> func;
  ^
jni/MyAppNative.cpp:7:24: error: 'func' was not declared in this scope
  std::function<void()> func;
                        ^
make: *** [obj/local/armeabi/objs/MyAppNative/MyAppNative.o] Error 1

My question is: is std::function supposed to be supported? I've seen it conditionally defined in the header, depending on _STLP_USE_BOOST_SUPPORT. Is that normal? I have attached a sample project if anyone is interested in testing.

http://www.filedropper.com/cpp11-functional-issue

Cheers

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  • You do add the -std=c++11 flag when building? Which version of GCC is used?
    – Some programmer dude
    Commented Nov 7, 2015 at 15:16
  • See developer.android.com/ndk/guides/cpp-support.html at "How to set your runtime".
    – Christian Hackl
    Commented Nov 7, 2015 at 15:38
  • Yes I did add the flag (you can take a look at the archive), the GCC version is 4.8 I think (it was at least, before I updated to r10e for testing). Christian> Thanks, but std::function is nowhere to be mentioned here. I'm using APP_STL := stlport_static already (in my downloadable sample), and nothing indicates that this version is downgraded.
    – Brunni
    Commented Nov 7, 2015 at 15:45
  • 2
    @Brunni: Why downgraded? AFAIK STLport has never had C++11 support.
    – Christian Hackl
    Commented Nov 7, 2015 at 16:10
  • 1
    Christian Hackl is right, you need gnustl_static or c++_static
    – Alex Cohn
    Commented Nov 7, 2015 at 17:41

2 Answers 2

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STLport, which you seem to be using, has never had C++11 support.

See developer.android.com/ndk/guides/cpp-support.html at "How to set your runtime" and choose a different one (gnustl_static or c++_static).

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3
  • It would be better to copy paste how to configure the runtime instead of linking to an external size. Like Brunni did, his answer helped me much faster.
    – mxmlnkn
    Commented Aug 19, 2016 at 0:49
  • My Application.mk APP_OPTIM := release APP_PLATFORM := android-14 APP_STL := c++_static APP_CFLAGS += -std=c++11 APP_CPPFLAGS += -frtti APP_CPPFLAGS += -fexceptions APP_CPPFLAGS += -DANDROID APP_CPPFLAGS += -std=gnu++0x LOCAL_CPP_FEATURES += exceptions APP_ABI := all APP_MODULES :=ndksampleapp NDK_TOOLCHAIN_VERSION := 4.9 but still I am getting error 'std::function' has not been declared
    – AdiAtAnd
    Commented Sep 14, 2016 at 2:34
  • Is it like stoi I will be able to get through c++_static and function through gnustl_static, coz if I replace with gnustl it is crying for stoi. I am new to this. This can sound silly or wrong question to some people. Please help.
    – AdiAtAnd
    Commented Sep 14, 2016 at 2:41
1

Ok so thanks to Christian and Alex, the answer is indeed to change your Application.mk so that it references gnustl_static.

APP_STL := gnustl_static

Thank you all!

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3
  • The unwritten rules of SO courtesy would suggest that you let Christian Hackl to post his comment as answer.
    – Alex Cohn
    Commented Nov 9, 2015 at 7:38
  • Yup I'm not used to it yet, but it clearly felt wrong :) Well for now I'll just cancel the answer mark and validate it when Christian Hackl posts an answer to this topic!
    – Brunni
    Commented Nov 13, 2015 at 12:42
  • @Brunni: No problem. I did not realise that my comment would actually help you so much that you'd consider it an answer :) I've turned it into an actual answer now.
    – Christian Hackl
    Commented Nov 13, 2015 at 16:39

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