cmake : make -Wmissing-prototypes etc. match the Makefile

CMakeLists.txt

@@ -434,8 +434,9 @@ if (LLAMA_ALL_WARNINGS)
             -Wno-unused-function
             -Wno-multichar
         )
-        if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
-            # g++ only
+        if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")  # clang++ only
+            set(cxx_flags ${cxx_flags} -Wmissing-prototypes)
+        elseif (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")  # g++ only
             set(cxx_flags ${cxx_flags} -Wno-format-truncation -Wno-array-bounds)
         endif()
     else()

examples/train-text-from-scratch/CMakeLists.txt

@@ -3,3 +3,11 @@ add_executable(${TARGET} train-text-from-scratch.cpp)
 install(TARGETS ${TARGET} RUNTIME)
 target_link_libraries(${TARGET} PRIVATE common llama ${CMAKE_THREAD_LIBS_INIT})
 target_compile_features(${TARGET} PRIVATE cxx_std_11)
+
+# TODO(cebtenzzre): remove this once PR #2632 gets merged
+if (NOT MSVC)
+    target_compile_options(${TARGET} PRIVATE -Wno-missing-declarations)
+endif()
+if (CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
+    target_compile_options(${TARGET} PRIVATE -Wno-missing-prototypes)
+endif()