An old project changed from Xcode7 to Xcode8 and updated Baidu map and Baidu navigation. The error report is as follows:
Apple Mach-O Linker (ld) Error Group
iOS “_OpenSSL_add_all_algorithms”, referenced from:
.

After checking the reasons, the solution is to put Baidu navigation on libbaidunavisdK.a at the bottom, as follows: