在编译Android ADBI时遇到'hijack.c'文件中使用未声明的标识符'PTRACE_GETREGS'错误。通过在Android.mk同级目录创建Application.mk文件，设置APP_PLATFORM为android-14，APP_ABI为armeabi-v7a，解决了编译问题。对于5.x版本，还需在Android.mk添加LOCAL_CFLAGS和LOCAL_LDFLAGS的-pie和-fPIE选项。
C:\Users\piao\Downloads\adbi\hijack\jni
λ ndk-build.cmd
Android NDK: APP_PLATFORM not set. Defaulting to minimum supported version android-14.
[arm64-v8a] Compile : hijack <= hijack.c
C:/Users/piao/Downloads/adbi/hijack/jni/../hijack.c:141:22: warning: passing 'unsigned char [16]' to parameter of type 'const char *' converts
between pointers to integer types with different sign [-Wpointer-sign]
if (strncmp(ELFMAG, ehdr.e_ident, SELFMAG)) { /* sanity */
^~~~~~~~~~~~
D:/DevelopTools/Android/sdk/ndk-bundle/build//../sysroot/usr/include\string.h:137:44: note: passing argument to parameter '__rhs' here
int strncmp(const char* __lhs, const char* __rhs, size_t __n) __attribute_pure__;
^
C:/Users/piao/Downloads/adbi/hijack/jni/../hijack.c:529:76: warning: comparison of unsigned expression
if ((*p = ptrace(PTRAC
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