CrystaX NDK

This macro is automatically defined if you use C++ compiler (i.e. @g++@ or @gcc -x c++@) . Obviously, you're doing something wrong, if it is undefined. The only reason I can guess right now is that you're compiling it in non-C++ mode. The simplest way to ensure that C++ compiler is used is making all sources ending by @.cpp@ extension. If this is not the case, or doesn't help, please provide minimal example, reproducing the problem.

I delete libs and obj folders to make the .zip file smaller, this time I think I will success!!!

Mario Li wrote:

I delete libs and obj folders to make the .zip file smaller, this time I think I will success!!!

Your example works just fine. I've added this at begin of @jni/test_macro_cplusplus.cpp@:

#if !defined(__cplusplus)
#error "__cplusplus is not defined!"
#endif

And it compiles without any errors:

$ /opt/android/crystax-ndk-10.3.1/ndk-build
[armeabi-v7a] Compile++ thumb: test_macro_cplusplus <= test_macro_cplusplus.cpp
[armeabi-v7a] SharedLibrary  : libtest_macro_cplusplus.so
[armeabi-v7a] Install        : libcrystax.so => libs/armeabi-v7a/libcrystax.so
[armeabi-v7a] Install        : libtest_macro_cplusplus.so => libs/armeabi-v7a/libtest_macro_cplusplus.so

I presume you've been mistaken by your IDE, which for some reason doesn't handle C++ code properly (looking on screenshot, I suppose it's Eclipse). Maybe it's wrong Eclipse settings, maybe it's Eclipse bug (it have problems with parsing more-or-less non-trivial C++ code for years). You shouldn't rely on IDE logic, doing such conclusions. Compiler is the only one whose behaviour is important.

This is definitely not the CrystaX NDK issue, so closing this ticket as "Invalid".