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Leftover Utf8String defines are causing ILLinker warnings (#41680)
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The CreateRuntimeRootILLinkDescriptorFile task, which generates most of S.P.CoreLib's ILLink.Descriptor file for coreclr, doesn't respect #ifdefs. So even though FEATURE_UTF8STRING is disabled in the release/5.0 branch, it is still generating entries for Char8 and Utf8String. But since these managed types do not exist, the ILLinker is raising warnings.

To fix this, comment the DEFINE_CLASS entries out of the header file.

Fix #41654
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@eerhardt
eerhardt committed Sep 1, 2020
1 parent 1186d1f commit 38017c3
Showing 1 changed file with 19 additions and 13 deletions.
32 changes: 19 additions & 13 deletions src/coreclr/src/vm/corelib.h
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Expand Up @@ -318,9 +318,12 @@ DEFINE_CLASS(ENCODING, Text, Encoding)

DEFINE_CLASS(RUNE, Text, Rune)

#ifdef FEATURE_UTF8STRING
DEFINE_CLASS(CHAR8, System, Char8)
#endif // FEATURE_UTF8STRING
// https://github.com/dotnet/runtime/issues/41654 - having DEFINE_CLASS (even under #ifdef) causes an entry
// in System.Private.CoreLib's ILLink.Descriptor.xml which causes warnings
// Use /// comments because CreateRuntimeRootILLinkDescriptorFile will still match `// DEFINE_CLASS`
/// #ifdef FEATURE_UTF8STRING
/// DEFINE_CLASS(CHAR8, System, Char8)
/// #endif // FEATURE_UTF8STRING

DEFINE_CLASS(ENUM, System, Enum)

Expand Down Expand Up @@ -849,16 +852,19 @@ DEFINE_METHOD(STRING, WCSLEN, wcslen,
DEFINE_METHOD(STRING, STRLEN, strlen, SM_PtrByte_RetInt)
DEFINE_PROPERTY(STRING, LENGTH, Length, Int)

#ifdef FEATURE_UTF8STRING
DEFINE_CLASS(UTF8_STRING, System, Utf8String)
DEFINE_METHOD(UTF8_STRING, CTORF_READONLYSPANOFBYTE,Ctor, IM_ReadOnlySpanOfByte_RetUtf8Str)
DEFINE_METHOD(UTF8_STRING, CTORF_READONLYSPANOFCHAR,Ctor, IM_ReadOnlySpanOfChar_RetUtf8Str)
DEFINE_METHOD(UTF8_STRING, CTORF_BYTEARRAY_START_LEN,Ctor, IM_ArrByte_Int_Int_RetUtf8Str)
DEFINE_METHOD(UTF8_STRING, CTORF_BYTEPTR, Ctor, IM_PtrByte_RetUtf8Str)
DEFINE_METHOD(UTF8_STRING, CTORF_CHARARRAY_START_LEN,Ctor, IM_ArrChar_Int_Int_RetUtf8Str)
DEFINE_METHOD(UTF8_STRING, CTORF_CHARPTR, Ctor, IM_PtrChar_RetUtf8Str)
DEFINE_METHOD(UTF8_STRING, CTORF_STRING, Ctor, IM_String_RetUtf8Str)
#endif // FEATURE_UTF8STRING
// https://github.com/dotnet/runtime/issues/41654 - having DEFINE_CLASS (even under #ifdef) causes an entry
// in System.Private.CoreLib's ILLink.Descriptor.xml which causes warnings.
// Use /// comments because CreateRuntimeRootILLinkDescriptorFile will still match `// DEFINE_CLASS`
/// #ifdef FEATURE_UTF8STRING
/// DEFINE_CLASS(UTF8_STRING, System, Utf8String)
/// DEFINE_METHOD(UTF8_STRING, CTORF_READONLYSPANOFBYTE,Ctor, IM_ReadOnlySpanOfByte_RetUtf8Str)
/// DEFINE_METHOD(UTF8_STRING, CTORF_READONLYSPANOFCHAR,Ctor, IM_ReadOnlySpanOfChar_RetUtf8Str)
/// DEFINE_METHOD(UTF8_STRING, CTORF_BYTEARRAY_START_LEN,Ctor, IM_ArrByte_Int_Int_RetUtf8Str)
/// DEFINE_METHOD(UTF8_STRING, CTORF_BYTEPTR, Ctor, IM_PtrByte_RetUtf8Str)
/// DEFINE_METHOD(UTF8_STRING, CTORF_CHARARRAY_START_LEN,Ctor, IM_ArrChar_Int_Int_RetUtf8Str)
/// DEFINE_METHOD(UTF8_STRING, CTORF_CHARPTR, Ctor, IM_PtrChar_RetUtf8Str)
/// DEFINE_METHOD(UTF8_STRING, CTORF_STRING, Ctor, IM_String_RetUtf8Str)
/// #endif // FEATURE_UTF8STRING

DEFINE_CLASS(STRING_BUILDER, Text, StringBuilder)
DEFINE_PROPERTY(STRING_BUILDER, LENGTH, Length, Int)
Expand Down

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