cmake: Support building nis module on system having libtirpc

glibc has removed Sun RPC. Use replacement libtirpc headers and library in
nis moduleupdated path for rpc.h for systems using libtirpc

See python/cpython#5137

This closes python-cmake-buildsystem#224

Co-authored-by: Jean-Christophe Fillion-Robin <jchris.fillionr@kitware.com>

cmake/ConfigureChecks.cmake

@@ -107,6 +107,9 @@ endif()
 find_path(SQLITE3_INCLUDE_PATH sqlite3.h)
 find_library(SQLITE3_LIBRARY sqlite3)
 
+find_path(TIRPC_RPC_INCLUDE_PATH rpc.h PATHS "/usr/include/tirpc/rpc")
+find_library(TIRPC_LIBRARY tirpc)
+
 if(WIN32)
   set(M_LIBRARIES )
   set(HAVE_LIBM 1)
@@ -2495,3 +2498,4 @@ endif()
 if(CMAKE_SYSTEM MATCHES Windows)
   set(PY_PLATFORM win32)
 endif()
+

cmake/extensions/CMakeLists.txt

@@ -147,7 +147,23 @@ endif()
 # UNIX-only extensions
 add_python_extension(fcntl REQUIRES UNIX SOURCES fcntlmodule.c)
 add_python_extension(grp REQUIRES UNIX SOURCES grpmodule.c)
-add_python_extension(nis REQUIRES UNIX HAVE_LIBNSL SOURCES nismodule.c LIBRARIES ${HAVE_LIBNSL})
+
+set(nis_REQUIRES UNIX HAVE_LIBNSL)
+set(nis_LIBRARIES ${HAVE_LIBNSL})
+set(nis_INCLUDEDIRS )
+if(TIRPC_LIBRARY AND TIRPC_RPC_INCLUDE_PATH)
+    # if rpc.h is provided by libtirpc (instead of being provided by glibc). See python/cpython#5137
+    list(APPEND nis_REQUIRES )
+    list(APPEND nis_LIBRARIES ${TIRPC_LIBRARY})
+    list(APPEND nis_INCLUDEDIRS ${TIRPC_RPC_INCLUDE_PATH}/../)
+endif()
+add_python_extension(nis
+    REQUIRES ${nis_REQUIRES}
+    SOURCES nismodule.c
+    LIBRARIES ${nis_LIBRARIES}
+    INCLUDEDIRS ${nis_INCLUDEDIRS}
+)
+
 add_python_extension(posix REQUIRES UNIX BUILTIN SOURCES posixmodule.c)
 add_python_extension(pwd REQUIRES UNIX BUILTIN SOURCES pwdmodule.c) # this is needed to find out the user's home dir if $HOME is not set
 add_python_extension(resource REQUIRES UNIX SOURCES resource.c)