[IVI] 17.1 debugging pit FAQ (compilation)

This article mainly records some classic compilation and debugging processes encountered in daily work .

One 、module xxx1 missing dependencies：xxx2

1.1 Problem description

FAILED：out/soong/.intermediates/....../android_arm_armv7-a-neon_cortex-a9_shared/......module xxx1 missing dependencies:xxx2

1.2 Cause analysis

The above error indicates that the compilation module xxx1 Rely on the xxx2 Kuo can't find . The problem may not be that simple , Because it is actually dependent xxx2 These libraries exist , But these libraries exist in /system/lib64/ Under the table of contents （ Because the supplier delivers only 64 Bit Library ）, So if you don't specify compilation 64 Bit cannot be traversed to /system/lib64/ In the catalog so library .

1.3 Solution

Only need Android.bp Chinese compiler xxx1 Add the following statement to the statement block in the Library ;

compile_mulitilib:"64",

Two 、ld.lld:error:undefined symbol:xxx

2.2 Cause analysis ：

Android Some related functions need to be compiled into static libraries when compiling , for example android::sp<xxx>,StatsType,android:IBinder.