[clang] [clang][bytecode] Reapply "Use tailcalls via `[[clang::musttail]]`" (PR #188419)

[Lukas Sommer via cfe-commits]

Timm =?utf-8?q?Bäder?= <tbaeder at redhat.com>,
Timm =?utf-8?q?Bäder?= <tbaeder at redhat.com>
Message-ID:
In-Reply-To: <llvm.org/llvm/llvm-project/pull/188419 at github.com>


sommerlukas wrote:

This is unfortunately breaking ASAN-builds on 64-bit x86, at least with Clang 19:
```
FAILED: tools/clang/lib/AST/CMakeFiles/obj.clangAST.dir/ByteCode/Interp.cpp.o
/usr/bin/clang++-19 -DCLANG_EXPORTS -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GLIBCXX_USE_CXX11_ABI=1 -D_GNU_SOURCE -D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_EXTENSIVE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/tmp/llvm-project/asan-build/tools/clang/lib/AST -I/tmp/llvm-project/clang/lib/AST -I/tmp/llvm-project/clang/include -I/tmp/llvm-project/asan-build/tools/clang/include -I/tmp/llvm-project/asan-build/include -I/tmp/llvm-project/llvm/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wno-pass-failed -Wmisleading-indentation -Wctad-maybe-unsupported -fno-omit-frame-pointer -fsanitize=address -fdiagnostics-color -ffunction-sections -fdata-sections -Xclang -fno-pch-timestamp -fno-common -Woverloaded-virtual -Wno-nested-anon-types -O2 -g -DNDEBUG -std=c++17 -UNDEBUG -fno-exceptions -funwind-tables -fno-rtti -Winvalid-pch -Xclang -include-pch -Xclang /tmp/llvm-project/asan-build/tools/clang/lib/AST/CMakeFiles/obj.clangAST.dir/cmake_pch.hxx.pch -Xclang -include -Xclang /tmp/llvm-project/asan-build/tools/clang/lib/AST/CMakeFiles/obj.clangAST.dir/cmake_pch.hxx -MD -MT tools/clang/lib/AST/CMakeFiles/obj.clangAST.dir/ByteCode/Interp.cpp.o -MF tools/clang/lib/AST/CMakeFiles/obj.clangAST.dir/ByteCode/Interp.cpp.o.d -o tools/clang/lib/AST/CMakeFiles/obj.clangAST.dir/ByteCode/Interp.cpp.o -c /tmp/llvm-project/clang/lib/AST/ByteCode/Interp.cpp

fatal error: error in backend: Stack realignment in presence of dynamic allocas is not supported withthis calling convention.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
```

https://github.com/llvm/llvm-project/pull/188419