cannot find -ltirpc: No such file or directory

[wangtao-work]

I use cross-compile aarch64-none-linux-gnu-gcc version 9.2.1 to compile without any problem, but when I use version 11.4 to compile, an error will be reported. The error is as follows:

CC testcases/network/rpc/rpc-tirpc/tests_pack/lib/librpc-tirpc.o
AR librpc-tirpc.a
RANLIB librpc-tirpc.a
CC testcases/network/rpc/basic_tests/rpc01/lib/librpc01.o
AR librpc01.a
RANLIB librpc01.a
rpc1.c: In function ‘main’:
rpc_server.c: In function ‘service_request’:
rpc1.c:96:56: warning: argument to ‘sizeof’ in ‘memcpy’ call is the same expression as the source; did you mean to provide an explicit length? [-Wsizeof-pointer-memaccess]
96 | memcpy(&server_sin.sin_addr, hp->h_addr, sizeof(hp->h_addr));
| ^
rpc_server.c:94:39: warning: cast between incompatible function types from ‘bool_t ()(void)’ {aka ‘int ()(void)’} to ‘bool_t (*)(XDR , ...)’ {aka ‘int ()(struct __rpc_xdr *, ...)’} [-Wcast-function-type]
94 | svc_sendreply(transp, (xdrproc_t)xdr_void, NULL);
| ^
/usr/lib/gcc-cross/aarch64-linux-gnu/11/../../../../aarch64-linux-gnu/bin/ld: cannot find -ltirpc: No such file or directory
collect2: error: ld returned 1 exit status

Question
1、-ltirpc or -lrpc-tirpc? how to specify？
2、Why do different compilers differ?

[pevik]

If you compile the old version as make V=1 you will see what was specified to get rpc. Because LTP supports libtirpc, but also glibc rpc (sunrpc implementation, which was removed in glibc 2.26), see https://github.com/linux-test-project/ltp/blob/master/m4/ltp-tirpc.m4.

Or, you can inspect generated include/mk/config.mk for LIBTIRPC_CFLAGS and LIBTIRPC_LIBS values.

I suspect you don't have libtirpc development headers installed for the toolchain and the old toolchain had glibc < 2.26, thus with their sunrpc implementation.