https://bugs.llvm.org/show_bug.cgi?id=47124
Bug ID: 47124
Summary: mac/arm64 codegen puts jump tables in __TEXT,__const
instead of __TEXT,__text, leading to ld64 warnings
about direct access to global weak symbols
Product: clang
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangb...@nondot.org
Reporter: nicolaswe...@gmx.de
CC: llvm-bugs@lists.llvm.org, neeil...@live.com,
richard-l...@metafoo.co.uk
thakis@Nicos-MacBook-Pro src % cat foo.cc
enum Status { kOk, kAborted, kConfigChanged, kError };
template <int StreamType>
struct DecoderStream {
void OnBufferReady(Status status);
};
template <int StreamType>
void DecoderStream<StreamType>::OnBufferReady(Status status) {
switch (status) {
case kOk:
case kConfigChanged:
break;
case kAborted:
case kError:
break;
}
}
template class DecoderStream<1>;
thakis@Nicos-MacBook-Pro src % ../bin/clang -c foo.cc -std=c++14
--target=arm64-apple-macosx
thakis@Nicos-MacBook-Pro src % ../bin/clang --target=arm64-apple-macosx -shared
-o libfoo.dylib foo.o -isysroot
/Applications/Xcode-beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk
ld: warning: direct access in function 'ltmp1' from file 'foo.o' to global weak
symbol 'DecoderStream<1>::OnBufferReady(Status)' from file 'foo.o' means the
weak symbol cannot be overridden at runtime. This was likely caused by
different translation units being compiled with different visibility settings.
ld: warning: direct access in function 'ltmp1' from file 'foo.o' to global weak
symbol 'DecoderStream<1>::OnBufferReady(Status)' from file 'foo.o' means the
weak symbol cannot be overridden at runtime. This was likely caused by
different translation units being compiled with different visibility settings.
ld: warning: direct access in function 'ltmp1' from file 'foo.o' to global weak
symbol 'DecoderStream<1>::OnBufferReady(Status)' from file 'foo.o' means the
weak symbol cannot be overridden at runtime. This was likely caused by
different translation units being compiled with different visibility settings.
ld: warning: direct access in function 'ltmp1' from file 'foo.o' to global weak
symbol 'DecoderStream<1>::OnBufferReady(Status)' from file 'foo.o' means the
weak symbol cannot be overridden at runtime. This was likely caused by
different translation units being compiled with different visibility settings.
This works fine with clang in Xcode 12 beta (which buts the jump tables in
__TEXT,__text instead of __TEXT,__const), but open-source clang and the clang
at http://github.com/apple/llvm-project don't handle this right.
Encountered in a Chromium component build (https://crbug.com/1107955).
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