c程式找不到函示庫 ld錯誤 函示庫各種雜症

signal SIGSEGV: address not mapped to object (fault address: 0x20)

static function不需要被呼叫就有可能發生錯誤

dlopen無法載入函示庫

https://stackoverflow.com/a/2991677/22299707

1. 用ldd -r 列出所以找不到的函式庫像這樣

           linux-vdso.so.1 (0x00007ffcfd376000)
           libjson-glib-1.0.so.0 => /lib/x86_64-linux-gnu/libjson-glib-1.0.so.0 (0x00007f210d72c000)
           .....
   undefined symbol: descriptor_table_google_2fprotobuf_2ftimestamp_2eproto        (./libnvds_msgconv.so)
   undefined symbol: _ZN6google8protobuf7Message17CopyWithSizeCheckEPS1_RKS1_      (./libnvds_msgconv.so)
   .....

2. 用c++filt顯示函式庫名稱，還原函數名稱

   c++filt _ZN6google8protobuf7Message17CopyWithSizeCheckEPS1_RKS1_