Compiler warnings when building "cheerp"

[mingodad]

After getting a working build script that works (see here #147 ) I did an aggregation of all compiler warnings from building cheerp-latest see the results bellow:

Total unique warnings type count =>	23
count	type
352	[-Wdeprecated-declarations]
220	[-Wunused-but-set-variable]
169	[-Wcheerp-maybe-slow]
90	[-Wunknown-attributes]
68	[-Wsign-compare]
60	[-Wshift-count-overflow]
52	[-Wcheerp-unsafe]
33	[-Wreorder-ctor]
25	[-Wunused-variable]
17	[-Wsign-conversion]
16	[-Wundefined-inline]
14	[-Wunused-parameter]
8	[-Wunused-private-field]
8	[-Wignored-attributes]
8	[-Wunused-function]
6	[-Winvalid-noreturn]
2	[-Wunused-const-variable]
2	[-Wc++98-compat-extra-semi]
2	[-Wmisleading-indentation]
2	[-Wundefined-internal]
1	[-Wimplicit-fallthrough]
1	[-Wunused-lambda-capture]
1	[-Wmacro-redefined]


Total unique files count =>	68
count	file
260	/tmp/cheerp-latest/cheerp-compiler/llvm/include/llvm/Cheerp/Utility.h
181	/tmp/cheerp-latest/cheerp-compiler/build_runtimes_genericjs/include/c++/v1/__functional/hash.h
104	/tmp/cheerp-latest/cheerp-compiler/llvm/include/llvm/Cheerp/Registerize.h
90	/tmp/cheerp-latest/cheerp-libs/system/wasi_shim.cpp
66	/tmp/cheerp-latest/cheerp-compiler/llvm/include/llvm/Cheerp/LinearMemoryHelper.h
61	/tmp/cheerp-latest/cheerp-compiler/build_runtimes_wasm/include/c++/v1/__functional/hash.h
52	/tmp/cheerp-latest/cheerp-compiler/llvm/include/llvm/Cheerp/PointerAnalyzer.h
30	/tmp/cheerp-latest/cheerp-compiler/libcxx/src/locale.cpp
29	/tmp/cheerp-latest/cheerp-compiler/llvm/lib/CheerpUtils/PointerAnalyzer.cpp
25	/tmp/cheerp-latest/cheerp-compiler/llvm/include/llvm/Cheerp/InvokeWrapping.h
24	/tmp/cheerp-latest/cheerp-compiler/build_runtimes_genericjs/include/c++/v1/__algorithm/shuffle.h
23	/tmp/cheerp-latest/cheerp-compiler/libcxxabi/src/cxa_cheerp.cpp
22	/tmp/cheerp-latest/cheerp-compiler/llvm/lib/CheerpWriter/CheerpWriter.cpp
14	/tmp/cheerp-latest/cheerp-compiler/libcxxabi/src/private_typeinfo.cpp
12	/tmp/cheerp-latest/cheerp-compiler/build_runtimes_genericjs/include/c++/v1/__threading_support
12	/tmp/cheerp-latest/cheerp-compiler/build_runtimes_wasm/include/c++/v1/__threading_support
12	/tmp/cheerp-latest/cheerp-compiler/build_runtimes_genericjs/include/c++/v1/__format/formatter_pointer.h
9	/tmp/cheerp-latest/cheerp-compiler/llvm/lib/CheerpUtils/SIMDLowering.cpp
8	/tmp/cheerp-latest/cheerp-compiler/llvm/lib/CheerpUtils/TypeOptimizer.cpp
8	/tmp/cheerp-latest/cheerp-compiler/build_runtimes_genericjs/include/c++/v1/__memory/shared_ptr.h
8	/tmp/cheerp-latest/cheerp-compiler/llvm/lib/CheerpWriter/CheerpWasmWriter.cpp
7	/tmp/cheerp-latest/cheerp-compiler/libcxxabi/src/fallback_malloc.cpp
6	/tmp/cheerp-latest/cheerp-compiler/libcxx/src/include/ryu/common.h
6	/tmp/cheerp-latest/cheerp-compiler/build_runtimes_genericjs/include/c++/v1/string
6	/tmp/cheerp-latest/cheerp-compiler/libcxxabi/src/cxa_aux_runtime.cpp
5	/tmp/cheerp-latest/cheerp-compiler/llvm/lib/CheerpWriter/PreExecute.cpp
5	/tmp/cheerp-latest/cheerp-compiler/clang/lib/CodeGen/CGExprScalar.cpp
4	/tmp/cheerp-latest/cheerp-compiler/build_runtimes_genericjs/include/c++/v1/ios
4	/tmp/cheerp-latest/cheerp-compiler/libcxxabi/src/cxa_guard_impl.h
3	/tmp/cheerp-latest/cheerp-compiler/libcxxabi/src/cxa_demangle.cpp
3	/tmp/cheerp-latest/cheerp-compiler/clang/lib/CodeGen/CGExprConstant.cpp
3	/tmp/cheerp-latest/cheerp-compiler/llvm/lib/Transforms/Scalar/SROA.cpp
3	/tmp/cheerp-latest/cheerp-compiler/clang/lib/CodeGen/CGVTables.cpp
3	/tmp/cheerp-latest/cheerp-compiler/libcxxabi/src/demangle/ItaniumDemangle.h
3	/tmp/cheerp-latest/cheerp-compiler/llvm/include/llvm/Cheerp/TypeOptimizer.h
3	/tmp/cheerp-latest/cheerp-compiler/llvm/lib/CheerpWriter/JSInterop.cpp
2	/tmp/cheerp-latest/cheerp-compiler/libcxx/src/mutex_destructor.cpp
2	/tmp/cheerp-latest/cheerp-compiler/clang/lib/AST/VTableBuilder.cpp
2	/tmp/cheerp-latest/cheerp-compiler/libcxxabi/src/abort_message.cpp
2	/tmp/cheerp-latest/cheerp-compiler/llvm/lib/CheerpUtils/NativeRewriter.cpp
2	/tmp/cheerp-latest/cheerp-compiler/llvm/lib/CheerpUtils/GlobalDepsAnalyzer.cpp
2	/tmp/cheerp-latest/cheerp-compiler/libcxx/src/condition_variable_destructor.cpp
2	/tmp/cheerp-latest/cheerp-compiler/libcxx/src/iostream.cpp
2	/tmp/cheerp-latest/cheerp-compiler/llvm/lib/CheerpUtils/IdenticalCodeFolding.cpp
2	/tmp/cheerp-latest/cheerp-compiler/llvm/lib/CheerpUtils/Registerize.cpp
2	/tmp/cheerp-latest/cheerp-compiler/libcxxabi/src/cxa_vector.cpp
2	/tmp/cheerp-latest/cheerp-compiler/llvm/lib/CheerpUtils/PointerPasses.cpp
1	/tmp/cheerp-latest/cheerp-compiler/llvm/lib/Transforms/AggressiveInstCombine/AggressiveInstCombine.cpp
1	/tmp/cheerp-latest/cheerp-compiler/llvm/lib/CheerpUtils/AllocaMerging.cpp
1	/tmp/cheerp-latest/cheerp-compiler/llvm/lib/Transforms/Scalar/JumpThreading.cpp
1	/tmp/cheerp-latest/cheerp-compiler/clang/lib/Sema/SemaExpr.cpp
1	/tmp/cheerp-latest/cheerp-compiler/libcxx/src/memory.cpp
1	/tmp/cheerp-latest/cheerp-compiler/llvm/lib/CheerpWriter/Opcodes.cpp
1	/tmp/cheerp-latest/cheerp-compiler/llvm/lib/CheerpUtils/StructMemFuncLowering.cpp
1	/tmp/cheerp-latest/cheerp-compiler/clang/lib/Basic/Targets/WebAssembly.cpp
1	/tmp/cheerp-latest/cheerp-compiler/clang/lib/CodeGen/CGClass.cpp
1	/tmp/cheerp-latest/cheerp-compiler/llvm/lib/Transforms/Utils/ScalarEvolutionExpander.cpp
1	/tmp/cheerp-latest/cheerp-compiler/clang/lib/CodeGen/ItaniumCXXABI.cpp
1	/tmp/cheerp-latest/cheerp-compiler/llvm/lib/CheerpWriter/CFGStackifier.cpp
1	/tmp/cheerp-latest/cheerp-libs/system/common.cpp
1	/tmp/cheerp-latest/cheerp-compiler/llvm/lib/CheerpUtils/SinkGenerator.cpp
1	/tmp/cheerp-latest/cheerp-compiler/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
1	/tmp/cheerp-latest/cheerp-compiler/build_runtimes_wasm/include/c++/v1/__random/random_device.h
1	/tmp/cheerp-latest/cheerp-compiler/llvm/lib/CheerpUtils/InvokeWrapping.cpp
1	/tmp/cheerp-latest/cheerp-compiler/llvm/lib/CheerpUtils/Utility.cpp
1	/tmp/cheerp-latest/cheerp-compiler/build_runtimes_genericjs/include/c++/v1/__random/random_device.h
1	/tmp/cheerp-latest/cheerp-compiler/llvm/lib/Transforms/Scalar/GVN.cpp
1	/tmp/cheerp-latest/cheerp-compiler/llvm/lib/CheerpUtils/LinearMemoryHelper.cpp


Total unique warnings count =>	67	
Total warnings count =>	1157
count	warning
352	warning: 'getPointerElementType' is deprecated: Deprecated without replacement, see https://llvm.org/docs/OpaquePointers.html for context and migration instructions [-Wdeprecated-declarations]
164	warning: variable 'modulePtr' set but not used [-Wunused-but-set-variable]
129	warning: Cheerp: Unions are less efficient than on native targets [-Wcheerp-maybe-slow]
62	warning: comparison of integers of different signs: 'int' and 'unsigned int' [-Wsign-compare]
60	warning: shift count >= width of type [-Wshift-count-overflow]
52	warning: Cheerp: Using values cast to unrelated types is undefined behaviour unless the destination type is the actual type of the value [-Wcheerp-unsafe]
52	warning: variable 'C' set but not used [-Wunused-but-set-variable]
45	warning: unknown attribute '__import_name__' ignored [-Wunknown-attributes]
45	warning: unknown attribute '__import_module__' ignored [-Wunknown-attributes]
40	warning: Cheerp: Casting genericjs pointers to integers may be slow. [-Wcheerp-maybe-slow]
33	warning: field 'functionTypeIndices' will be initialized after field 'maxFunctionId' [-Wreorder-ctor]
8	warning: inline function 'std::__libcpp_thread_id_equal' is not defined [-Wundefined-inline]
8	warning: '__stdcall' calling convention is not supported for this target [-Wignored-attributes]
8	warning: inline function 'std::__libcpp_thread_id_less' is not defined [-Wundefined-inline]
7	warning: implicit conversion changes signedness: 'size_t' (aka 'unsigned int') to 'int' [-Wsign-conversion]
6	warning: function declared 'noreturn' should not return [-Winvalid-noreturn]
5	warning: implicit conversion changes signedness: 'int' to 'size_t' (aka 'unsigned int') [-Wsign-conversion]
4	warning: unused parameter 'adjustedPtr' [-Wunused-parameter]
4	warning: implicit conversion changes signedness: 'int' to 'unsigned int' [-Wsign-conversion]
4	warning: unused parameter 'deref' [-Wunused-parameter]
3	warning: comparison of integers of different signs: 'size_type' (aka 'unsigned int') and 'int32_t' (aka 'int') [-Wsign-compare]
3	warning: unused variable 'it' [-Wunused-variable]
3	warning: comparison of integers of different signs: 'int32_t' (aka 'int') and 'size_type' (aka 'unsigned int') [-Wsign-compare]
2	warning: private field '__f_' is not used [-Wunused-private-field]
2	warning: unused function 'fallback_malloc' [-Wunused-function]
2	warning: unused variable 'UsableAllocSize' [-Wunused-const-variable]
2	warning: unused variable 'argType' [-Wunused-variable]
2	warning: unused variable 'opType' [-Wunused-variable]
2	warning: unused function 'is_fallback_ptr' [-Wunused-function]
2	warning: extra ';' outside of a function is incompatible with C++98 [-Wc++98-compat-extra-semi]
2	warning: unused parameter 'thrown_type' [-Wunused-parameter]
2	warning: unused parameter 'format' [-Wunused-parameter]
2	warning: private field '__m_' is not used [-Wunused-private-field]
2	warning: unused function 'fallback_free' [-Wunused-function]
2	warning: misleading indentation; statement is not part of the previous 'if' [-Wmisleading-indentation]
2	warning: private field '__cv_' is not used [-Wunused-private-field]
2	warning: unused parameter 'static_downcast_offset' [-Wunused-parameter]
2	warning: unused function 'update_offset_to_base' [-Wunused-function]
2	warning: function '__cxxabiv1::(anonymous namespace)::__syscall_futex' has internal linkage but is not defined [-Wundefined-internal]
1	warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
1	warning: unused variable 'GType' [-Wunused-variable]
1	warning: unused variable 'bitWidth' [-Wunused-variable]
1	warning: unused variable 'phi' [-Wunused-variable]
1	warning: variable 'CurrentIsDirectBase' set but not used [-Wunused-but-set-variable]
1	warning: unused variable 'offset' [-Wunused-variable]
1	warning: unused variable 'I' [-Wunused-variable]
1	warning: unused variable 'iter' [-Wunused-variable]
1	warning: unused variable 'destVecType' [-Wunused-variable]
1	warning: variable 'ret' set but not used [-Wunused-but-set-variable]
1	warning: unused variable 'FType' [-Wunused-variable]
1	warning: unused variable 'intrinsic' [-Wunused-variable]
1	warning: unused variable 'BlockLikeTokens' [-Wunused-variable]
1	warning: unused variable 'inserted' [-Wunused-variable]
1	warning: private field 'LayoutClass' is not used [-Wunused-private-field]
1	warning: unused variable 'kind' [-Wunused-variable]
1	warning: variable 'phiEdgesAdded' set but not used [-Wunused-but-set-variable]
1	warning: 'LIBBUILTIN' macro redefined [-Wmacro-redefined]
1	warning: unused variable 'DL' [-Wunused-variable]
1	warning: unused variable 't' [-Wunused-variable]
1	warning: lambda capture 'performPtrIntConversions' is not used [-Wunused-lambda-capture]
1	warning: unused variable 'oldTy' [-Wunused-variable]
1	warning: implicit conversion changes signedness: 'unsigned int' to 'int' [-Wsign-conversion]
1	warning: unused variable 'paramType' [-Wunused-variable]
1	warning: private field 'AddressPointIndex' is not used [-Wunused-private-field]
1	warning: variable 'end' set but not used [-Wunused-but-set-variable]
1	warning: unused variable 'srcVecType' [-Wunused-variable]
1	warning: unused variable 'num' [-Wunused-variable]

Using this squilu (https://github.com/mingodad/squilu) script that uses Lua patterns (https://www.lua.org/manual/5.4/manual.html#6.4.1) :

auto fname = "/tmp/cheerp-latest/build.log";
auto txt = readfile(fname);

auto warnings_list = {};
auto warnings_count = 0;
auto warnings_types_list = {};
auto files_list = {};

txt.gmatch(
	///tmp/cheerp-latest/cheerp-compiler/llvm/include/llvm/Cheerp/Utility.h:424:30: warning: 'getPointerElementType' is deprecated: Deprecated without replacement, see https://llvm.org/docs/OpaquePointers.html for context and migration instructions [-Wdeprecated-declarations]
	"\n([^\n]-):%d+:%d+: (warning:[^\n]+)",
	function(fname, warn) {
		table_incnum(warnings_list, warn, 1, true);
		++warnings_count;
		auto warn_type = warn.match("%b[]");
		table_incnum(warnings_types_list, warn_type, 1, true);
		table_incnum(files_list, fname, 1, true);
		return true;
	}
);

auto ary = table_toarray(warnings_types_list);
ary.sort(@(a,b) b[1] <=> a[1]);

print("Total unique warnings type count =>", ary.len());
print("count\ttype");
foreach(elm in ary) print(elm[1], elm[0]);

ary = table_toarray(files_list);
ary.sort(@(a,b) b[1] <=> a[1]);

print("\n\nTotal unique files count =>", ary.len());
print("count\tfile");
foreach(elm in ary) print(elm[1], elm[0]);

ary = table_toarray(warnings_list);
ary.sort(@(a,b) b[1] <=> a[1]);

print("\n\nTotal unique warnings count =>", ary.len(), "\nTotal warnings count =>", warnings_count);
print("count\twarning");
foreach(elm in ary) print(elm[1], elm[0]);

[mingodad]

And that number would be a bit bigger without this command line parameters:

-Wno-pointer-to-int-cast -Werror=implicit-function-declaration -Werror=implicit-int -Werror=pointer-sign -Werror=pointer-arith -Werror=int-conversion -Werror=incompatible-pointer-types -Qunused-arguments -Waddress -Warray-bounds -Wchar-subscripts -Wduplicate-decl-specifier -Winit-self -Wreturn-type -Wsequence-point -Wstrict-aliasing -Wunused-function -Wunused-label -Wunused-variable -Wno-int-conversion