cmake: Disable deprecation warnings for old known_hosts API

Signed-off-by: Andreas Schneider <asn@cryptomilk.org>

CompilerChecks.cmake

@@ -93,6 +93,8 @@ if (UNIX)
         add_c_compiler_flag("-Wno-error=tautological-compare" SUPPORTED_COMPILER_FLAGS)
     endif()
 
+    add_c_compiler_flag("-Wno-deprecated-declarations" DEPRECATION_COMPILER_FLAGS)
+
     # Unset CMAKE_REQUIRED_FLAGS
     unset(CMAKE_REQUIRED_FLAGS)
 endif()
@@ -112,3 +114,7 @@ endif()
 
 set(DEFAULT_C_COMPILE_FLAGS ${SUPPORTED_COMPILER_FLAGS} CACHE INTERNAL "Default C Compiler Flags" FORCE)
 set(DEFAULT_LINK_FLAGS ${SUPPORTED_LINKER_FLAGS} CACHE INTERNAL "Default C Linker Flags" FORCE)
+
+if (DEPRECATION_COMPILER_FLAGS)
+    set(DEFAULT_C_NO_DEPRECATION_FLAGS ${DEPRECATION_COMPILER_FLAGS} CACHE INTERNAL "Default no deprecation flags" FORCE)
+endif()

src/CMakeLists.txt

@@ -164,6 +164,12 @@ set(libssh_SRCS
   chachapoly.c
 )
 
+if (DEFAULT_C_NO_DEPRECATION_FLAGS)
+    set_source_files_properties(known_hosts.c
+                                PROPERTIES
+                                    COMPILE_FLAGS ${DEFAULT_C_NO_DEPRECATION_FLAGS})
+endif()
+
 if (CMAKE_USE_PTHREADS_INIT)
     set(libssh_SRCS
         ${libssh_SRCS}

tests/client/CMakeLists.txt

@@ -14,6 +14,11 @@ set(LIBSSH_CLIENT_TESTS
     torture_session
     torture_request_env)
 
+if (DEFAULT_C_NO_DEPRECATION_FLAGS)
+    set_source_files_properties(torture_knownhosts.c
+                                PROPERTIES
+                                    COMPILE_FLAGS ${DEFAULT_C_NO_DEPRECATION_FLAGS})
+endif()
 if (WITH_SFTP)
     if (WITH_BENCHMARKS)
         set(SFTP_BENCHMARK_TESTS