Sample build fail with NDK r20

[psklf]

SPECIFIC ISSUE ENCOUNTERED

When build hello_ar_c sample project, build fail.

  1 error generated.
  FAILED: Android/Sdk/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++  --target=i686-none-linux-android24 --gcc-toolchain=Android/Sdk/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64 --sysroot=Android/Sdk/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/sysroot  -Dhello_ar_native_EXPORTS -I../../../../src/main/cpp -IAndroid/Sdk/ndk-bundle/sources/third_party/vulkan/src/libs/glm -isystem/Project/SampleCode/arcore-android-sdk/samples/hello_ar_c/../../libraries/include -g -DANDROID -fdata-sections -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -fno-addrsig -Wa,--noexecstack -Wformat -Werror=format-security  -std=c++11 -Wall -O0 -fno-limit-debug-info  -fPIC -MD -MT CMakeFiles/hello_ar_native.dir/src/main/cpp/jni_interface.cc.o -MF CMakeFiles/hello_ar_native.dir/src/main/cpp/jni_interface.cc.o.d -o CMakeFiles/hello_ar_native.dir/src/main/cpp/jni_interface.cc.o -cSampleCode/arcore-android-sdk/samples/hello_ar_c/app/src/main/cpp/jni_interface.cc
  In file included fromSampleCode/arcore-android-sdk/samples/hello_ar_c/app/src/main/cpp/jni_interface.cc:21:
  In file included from ../../../../src/main/cpp/hello_ar_application.h:30:
  In file included from ../../../../src/main/cpp/background_renderer.h:26:
  In file included from ../../../../src/main/cpp/util.h:31:
  ../../../../src/main/cpp/glm.h:20:10: fatal error: 'glm.hpp' file not found
  #include "glm.hpp"
           ^~~~~~~~~
  1 error generated.
  ninja: build stopped: subcommand failed.

VERSIONS USED

• Android Studio: Android Studio 3.4.1 Build #AI-183.6156.11.34.5522156, built on May 2, 2019 JRE: 1.8.0_152-release-1343-b16-5323222 amd64 JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o Linux 4.4.0-21-generic

• ARCore SDK for Android: 1.9.0

• Device manufacturer, model, and O/S: N/A

• ARCore: On Windows, use: adb shell pm dump com.google.ar.core | findstr /i "packages: versionName" On macOS, use: adb shell pm dump com.google.ar.core | egrep -i versionName\|packages:N/A

• Output of adb shell getprop ro.build.fingerprint: N/A

STEPS TO REPRODUCE THE ISSUE

1. Build the hello_ar_c project

WORKAROUNDS (IF ANY)

Use the NDK of version 19c

ADDITIONAL COMMENTS

Can't find the GLM in NDK directory (version 20)

[fredsa]

Thanks for reporting this issue. This issue is caused by the fact that NDK r20 stopped bundling glm as part of the Vulkan distribution.

Options if this issue is blocking you:

1. Workaround this issue by using NDK version 19c (as suggested above)
2. Wait for the fix for the inclusion of the glm library in an upcoming release of the ARCore SDK for Android
3. Patch the current release manually (requires some work):
   • Use the public glm from https://glm.g-truc.net/0.9.9/index.html
   • Update sample, including proper include paths and changes to glm.h