Silence integer precision loss warning for protobuf fuzzers.

Author: bshastry

test/tools/ossfuzz/CMakeLists.txt

@@ -70,7 +70,11 @@ if (OSSFUZZ)
             protobuf.a
     )
     set_target_properties(yul_proto_ossfuzz PROPERTIES LINK_FLAGS ${LIB_FUZZING_ENGINE})
-    target_compile_options(yul_proto_ossfuzz PUBLIC ${COMPILE_OPTIONS} -Wno-sign-conversion -Wno-suggest-destructor-override -Wno-inconsistent-missing-destructor-override)
+    # The -Wno-* compile options are required for source files that
+    # are auto-generated by the protobuf compiler because the compiler
+    # does not generate warning-free C++ bindings with regard to
+    # upstream Clang builds that are used by ossfuzz.
+    target_compile_options(yul_proto_ossfuzz PUBLIC ${COMPILE_OPTIONS} -Wno-sign-conversion -Wno-suggest-destructor-override -Wno-inconsistent-missing-destructor-override -Wno-shorten-64-to-32)
 
     add_executable(
 	    yul_proto_diff_ossfuzz
@@ -88,7 +92,7 @@ if (OSSFUZZ)
             protobuf.a
     )
     set_target_properties(yul_proto_diff_ossfuzz PROPERTIES LINK_FLAGS ${LIB_FUZZING_ENGINE})
-    target_compile_options(yul_proto_diff_ossfuzz PUBLIC ${COMPILE_OPTIONS} -Wno-sign-conversion -Wno-suggest-destructor-override -Wno-inconsistent-missing-destructor-override)
+    target_compile_options(yul_proto_diff_ossfuzz PUBLIC ${COMPILE_OPTIONS} -Wno-sign-conversion -Wno-suggest-destructor-override -Wno-inconsistent-missing-destructor-override -Wno-shorten-64-to-32)
 
     add_executable(yul_proto_diff_custom_mutate_ossfuzz
             yulProto_diff_ossfuzz.cpp
@@ -106,7 +110,7 @@ if (OSSFUZZ)
             protobuf.a
     )
     set_target_properties(yul_proto_diff_custom_mutate_ossfuzz PROPERTIES LINK_FLAGS ${LIB_FUZZING_ENGINE})
-    target_compile_options(yul_proto_diff_custom_mutate_ossfuzz PUBLIC ${COMPILE_OPTIONS} -Wno-sign-conversion -Wno-suggest-destructor-override -Wno-inconsistent-missing-destructor-override)
+    target_compile_options(yul_proto_diff_custom_mutate_ossfuzz PUBLIC ${COMPILE_OPTIONS} -Wno-sign-conversion -Wno-suggest-destructor-override -Wno-inconsistent-missing-destructor-override -Wno-shorten-64-to-32)
 
     add_executable(stack_reuse_codegen_ossfuzz
             StackReuseCodegenFuzzer.cpp
@@ -131,6 +135,7 @@ if (OSSFUZZ)
             -Wno-unused-parameter
             -Wno-zero-length-array
             -Wno-suggest-destructor-override
+            -Wno-shorten-64-to-32
     )
 
     add_executable(abiv2_proto_ossfuzz
@@ -151,7 +156,7 @@ if (OSSFUZZ)
             protobuf.a
     )
     set_target_properties(abiv2_proto_ossfuzz PROPERTIES LINK_FLAGS ${LIB_FUZZING_ENGINE})
-    target_compile_options(abiv2_proto_ossfuzz PUBLIC ${COMPILE_OPTIONS} -Wno-sign-conversion -Wno-suggest-destructor-override -Wno-inconsistent-missing-destructor-override)
+    target_compile_options(abiv2_proto_ossfuzz PUBLIC ${COMPILE_OPTIONS} -Wno-sign-conversion -Wno-suggest-destructor-override -Wno-inconsistent-missing-destructor-override -Wno-shorten-64-to-32)
 
     add_executable(abiv2_isabelle_ossfuzz
             AbiV2IsabelleFuzzer.cpp
@@ -173,7 +178,7 @@ if (OSSFUZZ)
             gmp.a
     )
     set_target_properties(abiv2_isabelle_ossfuzz PROPERTIES LINK_FLAGS ${LIB_FUZZING_ENGINE})
-    target_compile_options(abiv2_isabelle_ossfuzz PUBLIC ${COMPILE_OPTIONS} -Wno-sign-conversion -Wno-suggest-destructor-override -Wno-inconsistent-missing-destructor-override)
+    target_compile_options(abiv2_isabelle_ossfuzz PUBLIC ${COMPILE_OPTIONS} -Wno-sign-conversion -Wno-suggest-destructor-override -Wno-inconsistent-missing-destructor-override -Wno-shorten-64-to-32)
 
     add_executable(sol_proto_ossfuzz
             solProtoFuzzer.cpp
@@ -193,7 +198,7 @@ if (OSSFUZZ)
             protobuf.a
     )
     set_target_properties(sol_proto_ossfuzz PROPERTIES LINK_FLAGS ${LIB_FUZZING_ENGINE})
-    target_compile_options(sol_proto_ossfuzz PUBLIC ${COMPILE_OPTIONS} -Wno-sign-conversion -Wno-suggest-destructor-override -Wno-inconsistent-missing-destructor-override)
+    target_compile_options(sol_proto_ossfuzz PUBLIC ${COMPILE_OPTIONS} -Wno-sign-conversion -Wno-suggest-destructor-override -Wno-inconsistent-missing-destructor-override -Wno-shorten-64-to-32)
 else()
     add_library(solc_ossfuzz
             solc_ossfuzz.cpp