gulfemsavrun wrote:
We started seeing the following failure, and I bisected it to this commit.
```
[1343/43547](319) CXX
host_x64/obj/third_party/protobuf/src/google/protobuf/libprotobuf_lite.generated_message_tctable_lite.cc.o
FAILED: [code=1]
host_x64/obj/third_party/protobuf/src/google/protobuf/libprotobuf_lite.generated_message_tctable_lite.cc.o
../../build/rbe/reclient_cxx.sh --working-subdir=out/not-default
--exec_strategy=remote_local_fallback --preserve_unchanged_output_mtime --
../../prebuilt/third_party/clang/linux-x64/bin/clang++ -MD -MF
host_x64/obj/third_party/protobuf/src/google/protobuf/libprotobuf_lite.generated_message_tctable_lite.cc.o.d
-DTOOLCHAIN_VERSION=xBAWf3R2sN1ViZaJjFVJTCaaAZEuAtpSDTaGs7iC35IC
-D_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS -D_LIBCPP_REMOVE_TRANSITIVE_INCLUDES
-DGOOGLE_PROTOBUF_NO_RTTI -DHAVE_PTHREAD -I../.. -Ihost_x64/gen
-I../../third_party/protobuf/src
-I../../third_party/protobuf/third_party/utf8_range
-I../../third_party/abseil-cpp -fcolor-diagnostics
-fcrash-diagnostics-dir=clang-crashreports -fcrash-diagnostics=all
-ffp-contract=off --sysroot=../../prebuilt/third_party/sysroot/linux
--target=x86_64-unknown-linux-gnu -ffile-compilation-dir=.
-no-canonical-prefixes -fomit-frame-pointer -fdata-sections -ffunction-sections
-Og -Xclang -debug-info-kind=constructor -g3 -grecord-gcc-switches -gdwarf-5
-gz=zstd -Wall -Wextra -Wconversion -Wextra-semi -Wimplicit-fallthrough
-Wnewline-eof -Wstrict-prototypes -Wwrite-strings -Wno-sign-conversion
-Wno-unused-parameter -Wnonportable-system-include-path
-Wno-missing-field-initializers -Wno-extra-qualification
-Wno-cast-function-type-strict -Wno-cast-function-type-mismatch
-Wno-unknown-warning-option -Wno-missing-template-arg-list-after-template-kw
-Wno-deprecated-pragma -Wno-nontrivial-memaccess -fvisibility=hidden -Werror
-Wa,--fatal-warnings --sysroot=../../prebuilt/third_party/sysroot/linux
--target=x86_64-unknown-linux-gnu -Wno-deprecated-pragma
-Wno-enum-enum-conversion -Wno-extra-semi -Wno-float-conversion
-Wno-implicit-float-conversion -Wno-implicit-int-conversion
-Wno-implicit-int-float-conversion -Wno-invalid-noreturn
-Wno-missing-field-initializers -Wno-sign-compare -Wno-unused-function
-Wno-unused-private-field -Wno-deprecated-declarations
-Wno-deprecated-this-capture -Wno-unnecessary-virtual-specifier
-Wno-c++98-compat-extra-semi -Wno-shorten-64-to-32 -Wno-sign-compare
-Wno-missing-field-initializers -Wno-conversion -Wno-unknown-warning-option
-Wno-implicit-int-float-conversion -Wno-array-parameter
-Wno-deprecated-builtins -fvisibility-inlines-hidden -stdlib=libc++
-stdlib=libc++ -std=c++20 -Wno-deprecated-this-capture -fno-exceptions
-fno-rtti -ftemplate-backtrace-limit=0 -stdlib=libc++ -c
../../third_party/protobuf/src/google/protobuf/generated_message_tctable_lite.cc
-o
host_x64/obj/third_party/protobuf/src/google/protobuf/libprotobuf_lite.generated_message_tctable_lite.cc.o
../../third_party/protobuf/src/google/protobuf/generated_message_tctable_lite.cc:68:28:
error: cannot compile this tail call skipping over cleanups yet
68 | PROTOBUF_MUSTTAIL return GenericFallbackImpl<MessageLite,
std::string>(
|
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
69 | PROTOBUF_TC_PARAM_PASS);
| ~~~~~~~~~~~~~~~~~~~~~~~
```
I'm uploading a reproducer.
[clang-crashreports.zip](https://github.com/user-attachments/files/19859700/clang-crashreports.zip)
Any ideas why we might be hitting this issue? This happens during a built with
`-Og`, and issue does not remove if I remove `-Og` flag.
https://github.com/llvm/llvm-project/pull/118026
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