Compiling in THIRDPARTY_STATIC_BUILD mode fails to link

[liudf0716]

It's the compiling step:

1. fork project and compile

git clone https://github.com/${YOUR_GITHUB_ACCOUNT_NAME}/xfrpc.git
cd xfrp
mkdir build
cmake -D THIRDPARTY_STATIC_BUILD=ON ..
make

2. at the link stage, the error 'undefined reference to `arc4random' is encountered

[  5%] Building C object CMakeFiles/xfrpc.dir/main.c.o
[ 10%] Building C object CMakeFiles/xfrpc.dir/client.c.o
[ 15%] Building C object CMakeFiles/xfrpc.dir/config.c.o
[ 20%] Building C object CMakeFiles/xfrpc.dir/control.c.o
[ 25%] Building C object CMakeFiles/xfrpc.dir/ini.c.o
[ 30%] Building C object CMakeFiles/xfrpc.dir/msg.c.o
[ 35%] Building C object CMakeFiles/xfrpc.dir/xfrpc.c.o
[ 40%] Building C object CMakeFiles/xfrpc.dir/debug.c.o
[ 45%] Building C object CMakeFiles/xfrpc.dir/zip.c.o
[ 50%] Building C object CMakeFiles/xfrpc.dir/commandline.c.o
[ 55%] Building C object CMakeFiles/xfrpc.dir/crypto.c.o
[ 60%] Building C object CMakeFiles/xfrpc.dir/fastpbkdf2.c.o
[ 65%] Building C object CMakeFiles/xfrpc.dir/utils.c.o
[ 70%] Building C object CMakeFiles/xfrpc.dir/common.c.o
[ 75%] Building C object CMakeFiles/xfrpc.dir/login.c.o
[ 80%] Building C object CMakeFiles/xfrpc.dir/proxy_tcp.c.o
[ 85%] Building C object CMakeFiles/xfrpc.dir/proxy_ftp.c.o
[ 90%] Building C object CMakeFiles/xfrpc.dir/proxy.c.o
[ 95%] Building C object CMakeFiles/xfrpc.dir/tcpmux.c.o
[100%] Linking C executable xfrpc
/usr/bin/ld: /workspaces/codespaces-blank/xfrpc/thirdparty/libs/libjson-c.a(random_seed.c.o): in function `json_c_get_random_seed':
/workspaces/codespaces-blank/xfrpc/thirdparty/json-c/random_seed.c:331: undefined reference to `arc4random'
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/xfrpc.dir/build.make:354: xfrpc] Error 1
make[1]: *** [CMakeFiles/Makefile2:96: CMakeFiles/xfrpc.dir/all] Error 2
make: *** [Makefile:130: all] Error 2

[helintongh]

I know the cause of the error, and will fix this bug in the compilation of adding mips architecture.

[helintongh]

Replacing the json.h in the include with the generated json.h should fix the issue.
pr is #36