With NDK 13b, C++ cannot find <...> headers #255
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The compiler and editor both show nice little errors like:
In file included from D:\git-repos\thing-browser-android\jni\core\NativeDownloadTask.cpp:2:
D:\git-repos\thing-browser-android\jni\core/NativeDownloadTaskHelper.h:5:10: fatal error: 'memory' file not found
#include <memory>
^
1 error generated.
In file included from D:\git-repos\thing-browser-android\jni\core/Renderer.h:10:
D:\git-repos\thing-browser-android\jni\core/../types/Shader.h:11:10: fatal error: 'string' file not found
#include <string>
^
1 error generated.
And so on… See attached log.
This same project builds fine using NDK 12b.
See [output.txt](https://github.com/android-ndk/ndk/files/637790/output.txt)
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can you compile using cppFlags.add("-v") and/or CFlags.add('-v') to see your compiler command options? c++_shared works for us in our dlib implementation which uses the same headers/functions which are not found in your build. |
Our android.ndk section which works |
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Verbose output attached. |
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LLVM-c++ which is what c++_shared is based on is known to be incomplete for r13 (see #82) how about listing all the files here on your machine here D:\Users\jessh\AppData\Local\Android\sdk1\ndk-bundle\sources\cxx-stl\llvm-libc++\libcxx\include ? If the files aren't there, they are probably not included in the c++_shared. But I know we use some of the includes which are missing for you so there is something else going on. |
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There is no such directory in NDK 13b (both as per installed by the SDK manager and in the Windows x86_64 download).
D:\Users\jessh\AppData\Local\Android\sdk1\ndk-bundle\sources\cxx-stl\llvm-libc++\include exists, however, and does include a “string” file, but note the lack of “libcxx” in the path.
In NDK 12b, the directory in question is …\sources\cxx-stl\llvm-libc++\libcxx\include, i.e. it does include libcxx in the path.
From: Victor Vedovato [mailto:notifications@github.com]
Sent: Thursday, December 08, 2016 9:43 AM
To: android-ndk/ndk <ndk@noreply.github.com>
Cc: Holle, Jess <jessh@ptc.com>; Author <author@noreply.github.com>
Subject: Re: [android-ndk/ndk] With NDK 13b, C++ cannot find <...> headers (#255)
LLVM-c++ which is what c++_shared is based on is known to be incomplete for r13 (see #82<#82>)
how about listing all the files here on your machine here D:\Users\jessh\AppData\Local\Android\sdk1\ndk-bundle\sources\cxx-stl\llvm-libc++\libcxx\include ?
If the files aren't there, there are probably not included in the c++_shared. But I know we use some of the includes which are missing for you so there is something else going on.
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These are my entries in r13b / sources / cxx-stl : And in llvm-libc++ (edited for brevity): and in include : |
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Maybe you need to "find . -name build | xargs rm -rf" to remove all build directories then run File -> Invalidate Caches and Restart It is possible Android Studio has cached your old paths. Or your path is different under Windoz. |
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From my DLIB compile : compiling image_io.cpp successful. |
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I exited Android Studio, removed the .idea, .gradle, and build directories, re-imported the project into Android Studio, and the problem persists. I also tried Invalidate Caches and Restart -- so this is not a stale cache problem or at least not one I can do anything about. |
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You could try removing your D:\Users\jessh\AppData\Local\Android\sdk1 and completely reloading the SDK and NDK. The problem seems to be the wrong include path. Have you tried hard-coding the -I path to cxx_shared includes ? |
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I’ve tried separately loading an NDK and pointing the gradle properties at that instead – and the result was the same.
I’ve not tried hard-coding the -I, as that’s really just a hack.
Perhaps this is as simple as being a platform-specific bug. Has anyone successfully included string, etc, C++ headers from an experimental gradle plugin NDK 13b build on Windows?
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It's a hack to figure out if something else is wrong - to see if it can work. It is likely your SDK / NDK bundle is mangled in some way as it should not generate bogus -I paths. |
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I build our library on OSX 10.10 and Ubuntu 14.04 and 16.04 - no windows around here. |
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I can try hacking in -I as a troubleshooting measure. As for the NDK being mangled in some way, I’ve tried both the SDK bundled NDK and separate NDK downloads to no avail.
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What about a completely clean SDK and NDK install? If that doesn't work, I will dust-off an old windows 7 machine to try our build. |
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How does one do a completely clean SDK install when starting with the Android Studio bundled SDK (and then get back to that point later)?
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move your old SDK from D:\Users\jessh\AppData\Local\Android somewhere temporarily. Launch Android Studio or the SDK Manager and re-download / install all the items you need. |
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I tried again with a clean SDK and NDK and got the same basic result. |
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Apologies for not responding sooner, I've been on out for most of the week. Thanks a lot to @victorv for helping out :) The core of the issue here (not finding libc++ headers) because they've (as you've noticed) moved from |
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Still looking in ndk-bundle\sources\cxx-stl\llvm-libc++\libcxx\include - maybe as @DanAlbert suggests you are running and old Android Studio, gradle plugin, etc.. We are using AS 2.2.2 and |
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I had been using classpath 'com.android.tools.build:gradle-experimental:0.7.0'. This appears to have been the problem. When re-importing the project, Android Studio suggested that I upgrade, but I had been in the habit of ignoring/negating this suggestion as it had caused issues in the past. At this point, however, it seems to work fine and solve the issue! |
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yay! |
With NDK 13b, Android Studio 2.2.x (at least 2.2.2 and 2.2.3 and using the experimental NDK plugin) can no longer follow includes of , , , etc.
I am filing this as an NDK bug as all previous NDK versions worked just fine with various Android Studio versions.
I am currently stuck at NDK 12b awaiting some resolution of this issue.
build.gradle excerpt:
build.gradle.snippet.txt
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