Develop Reference

Trying to get BGFX to build for Android

We're trying to get BGFX to build for Android, following the guide here: https://github.com/Nodrev/bgfx-android-activity as recommended on the BGFX main site.
However, this repository was last updated 3+ years ago, and since then there have been major revisions to the Android NDK structure, meaning all of the library paths are all wrong. We've managed to make some progress, but keep getting stuck on the same error.
What we've tried so far:
Using various NDK versions from 17 to 25. NDK 21 seems to be the one before the big change in NDK structure but we consistently get an error at some point during the build with each NDK: 'alloca.h' file not found
Using NDK 25, we got various other errors due to incorrect paths, managed to get past those, but this just led us back to the above error.
Posting a message on the BGFX discussion board, no response.
We found a message here that appears to describe the problem we're having but the second solution does not work, with error:
error: use of undeclared identifier 'GL_PARAMETER_BUFFER_ARB' ...GL_CHECK(glBindBuffer(GL_PARAMETER_BUFFER_ARB, 0) );
and the first solution doesn't contain enough information to try to replicate it.
The main issue we're having is that it seems there is a variable sysroot which tells the build process where to look for headers and libraries, this points to --sysroot=$(ANDROID_NDK_ROOT)/platforms/android-32/arch-arm in the build script, which does not exist. Setting it to a platform that does exist, e.g. --sysroot=$(ANDROID_SDK_ROOT)/platforms/android-32/ got us as far as the alloc.h error above.
alloca.h is found in \AppData\Local\Android\Sdk\ndk\25.1.8937393\toolchains\llvm\prebuilt\windows-x86_64\sysroot\usr\include so we tried setting sysroot to $(ANDROID_NDK_X86)/sysroot/usr/
which led to the error:
\AppData\Local\Android\Sdk\ndk\25.1.8937393\toolchains\llvm\prebuilt\windows-x86_64/sysroot/usr//include/linux/types.h:21:10: fatal error: 'asm/types.h' file not found
asm/types.h is found in a few places:
ndk\25.1.8937393\toolchains\llvm\prebuilt\windows-x86_64\sysroot\usr\include\aarch64-linux-android\asm ndk\25.1.8937393\toolchains\llvm\prebuilt\windows-x86_64\sysroot\usr\include\arm-linux-androideabi\asm ndk\25.1.8937393\toolchains\llvm\prebuilt\windows-x86_64\sysroot\usr\include\i686-linux-android\asm
but changing sysroot to point to e.g. --sysroot=$(ANDROID_NDK_ARM)/sysroot/usr/include/arm-linux-androidabi gets us back to the alloca.h error again.
This is the error in full:
process_begin: CreateProcess(NULL, uname, ...) failed.
makefile:6: pipe: No error
C:/ProgramData/chocolatey/lib/make/tools/install/bin/make.exe -R -C .build/projects/gmake-android-arm config=debug
make[1]: Entering directory '.../bgfx/.build/projects/gmake-android-arm'
"==== Building bx (debug) ===="
allocator.cpp
In file included from ../../../../bx/src/allocator.cpp:6:
In file included from ../../../../bx/include/bx/allocator.h:9:
../../../../bx/include/bx/bx.h:9:10: fatal error: 'alloca.h' file not found
#include <alloca.h> // alloca
^~~~~~~~~~
1 error generated.
make[2]: *** [bx.make:441: ../../android-arm/obj/Debug/bx/bx/src/allocator.o] Error 1
make[1]: *** [Makefile:17: bx] Error 2
make[1]: Leaving directory '.../bgfx/.build/projects/gmake-android-arm'
make: *** [makefile:69: android-arm-debug] Error 2
We've run out of ideas at this point, would greatly appreciate some help!

Error while building old Android Kernel 3.10

I'm trying to build an old Android Kernel which is provided by Asus.
I've uploaded the source code here : https://github.com/dchenaux/android_kernel_asus_z300c
I'm getting the following error :
arch/x86/kernel/setup.c: In function ‘setup_arch’:
arch/x86/kernel/setup.c:1134:2: error: implicit declaration of function ‘early_init_dt_scan’ [-Werror=implicit-function-declaration]
early_init_dt_scan(x86_fdt_header());
^
cc1: some warnings being treated as errors
Does someone know where it could come from ? Is it my environment ? Or the configuration ?
Thanks for your help

Unordered_map declaration throws error with NDK (clang), works fine with gcc

I'm trying to run a C++ project on Android. The following statement appears in one of the source files (part of a big project).
std::unordered_map <int, std::shared_ptr<Frame>, std::hash<int>, std::equal_to<int>,
Eigen::aligned_allocator< std::pair<const int, std::shared_ptr<Frame> > > > idToKeyFrame;
The NDK build complains the following
sysroot/usr/include/c++/v1/unordered_map:1684:5: error: static_assert failed due to requirement 'is_same<value_type, typename allocator_type::value_type>::value' "Invalid allocator::value_type"
I cannot spot what part of declaration is incompatible. Please help in fixing this error.
cplusplus.com reference
Update
When I modify the allocator (as suggested in comment by Marc) to Eigen::aligned_allocator<std::pair<int, std::shared_ptr<Frame>>> The error message remains the same but line number changes
sysroot/usr/include/c++/v1/unordered_map:854:5: error: static_assert failed due to requirement 'is_same<value_type, typename allocator_type::value_type>::value' "Invalid allocator::value_type"
Update++
According to this answer :
libstdc++ does not static_assert, libstdc++ ignores the exact type of the allocator and rebinds it to the container's value type.
and
Clang/libc++ are not forgiving
Yet another Update
I have been able to go past the error by commenting out the line in the source for unordered_map. This is a resort for now (until I get a solution).

iOS Build failure for CodenameOne

I've built the iOS version of my app about a month or so ago. Then added a few extra messages to the UI, tested with the Android version and now when I rebuild the iOS version it seems to fail. The error log is at: https://s3.amazonaws.com/codenameone-build-response/621a8710-2900-45a3-afdb-e3a30bdb1265-1504680431641-error.txt
At the bottom of this, the only actual failure I see is:
** ARCHIVE FAILED **
The following build commands failed:
CompileC build/Build/Intermediates/ArchiveIntermediates/MyApplication/IntermediateBuildFilesPath/MyApplication.build/Release-iphoneos/MyApplication.build/Objects-normal/arm64/com_codename1_io_websocket_WebSocketNativeImplImpl.o MyApplication-src/com_codename1_io_websocket_WebSocketNativeImplImpl.m normal arm64 objective-c com.apple.compilers.llvm.clang.1_0.compiler
(1 failure)
Failed xcodebuild step
I have updated the CN1Libs a few days ago. Not really sure what about this is actually failing to build.

Notice that the file com_codename1_io_websocket_WebSocketNativeImplImpl.m is mentioned in the final lines which means that's the file that failed. If you search the file for mentions of com_codename1_io_websocket_WebSocketNativeImplImpl.m you will find:
src/com_codename1_io_websocket_WebSocketNativeImplImpl.m -o /var/folders/zh/kb_4hqhn4kg1h0r5dp_6htcm0000gn/T/build7085253492970683151xxx/dist/build/Build/Intermediates/ArchiveIntermediates/MyApplication/IntermediateBuildFilesPath/MyApplication.build/Release-iphoneos/MyApplication.build/Objects-normal/arm64/com_codename1_io_websocket_WebSocketNativeImplImpl.o
/var/folders/zh/kb_4hqhn4kg1h0r5dp_6htcm0000gn/T/build7085253492970683151xxx/dist/MyApplication-src/com_codename1_io_websocket_WebSocketNativeImplImpl.m:23:9: fatal error: 'com_codename1_io_websocket_WebSocket.h' file not found
#import "com_codename1_io_websocket_WebSocket.h"
^
1 error generated.
This might be a bit confusing but it generally means you added the cn1lib for websockets and didn't use it. That's a problem as our VM strips out unused code but the websockets cn1lib needs to include the callback interface which is now stripped away.

C, Android NDK: import own input.h version containing missing declarations

I'm trying to get the Eventinjector project from pocketmagic.net found here.
This means working with a precoded jni library writen in C. My problem is that I get some build errors when I try to compile the native code. The error log is long and I believe all errors are the same, therefore I'll only post part of it.
jni/EventInjector.h:718:9: error: (near initialization for 'mt_tool_labels[0].value')
jni/EventInjector.h:719:9: error: 'MT_TOOL_PEN' undeclared here (not in a function)
jni/EventInjector.h:719:9: error: initializer element is not constant
jni/EventInjector.h:719:9: error: (near initialization for 'mt_tool_labels[1].value')
jni/EventInjector.h:720:9: error: 'MT_TOOL_MAX' undeclared here (not in a function)
jni/EventInjector.h:720:9: error: initializer element is not constant
jni/EventInjector.h:720:9: error: (near initialization for 'mt_tool_labels[2].value')
jni/EventInjector.c: In function 'debug':
jni/EventInjector.c:82:2: error: format not a string literal and no format arguments [- Werror=format-security]
cc1.exe: some warnings being treated as errors
make: *** [obj/local/armeabi/objs/EventInjector/EventInjector.o] Error 1
Going throught the comments under the blogpost I discovered that "Alessandro" had the same problem but had found a solution. (post 51) " I had the same issue and imported my own input.h version containing all the missing declarations."
This is the part of the .c file that generates most of the errors:
static struct label key_labels[] = {
LABEL(KEY_RESERVED),
LABEL(KEY_ESC),
LABEL(KEY_1),
LABEL(KEY_2),
LABEL(KEY_3),
LABEL(KEY_4),
LABEL(KEY_5),
LABEL(KEY_6),
LABEL(KEY_7),
LABEL(KEY_8),
LABEL(KEY_9),
LABEL(KEY_0),
LABEL(KEY_MINUS),
LABEL(KEY_EQUAL),
LABEL(KEY_BACKSPACE),
...
I have no experience in C, and don't know what he means. So my question is: how do I do this?
I have succesfully compiled other JNI libs, using NDK v9 and cygwin, so there should not be a problem with my settings and enviroment.

I had the same issue and imported my own input.h version containing all the missing declarations.
You can do same thing and replace your input.h (you can search for input.h with those undefine identifiers in linux kernel sources), but easier way is to remove lines containing undefined identifiers from EventInjector.h. Just comment all lines that highlighted red in eclipse, and it should work.