pitrou opened a new issue, #36475:
URL: https://github.com/apache/arrow/issues/36475
### Describe the bug, including details regarding any error messages,
version, and platform.
Flight feature verification fails in the `test-debian-11-python-3` CI job
for reasons that have nothing to do with the feature being present/absent:
```
-- Checking support for TlsCredentialsOptions (gRPC >= 1.27)...
-- TlsCredentialsOptions (for gRPC 1.27) not found in grpc::experimental.
CMake Warning at src/arrow/flight/CMakeLists.txt:132 (message):
Build output:
Call Stack (most recent call first):
src/arrow/flight/CMakeLists.txt:154 (test_grpc_version)
CMake Warning at src/arrow/flight/CMakeLists.txt:134 (message):
Change Dir: /build/cpp/src/arrow/flight/try_compile/CMakeFiles/CMakeTmp
Run Build Command(s):/usr/bin/ninja cmTC_e1328 && [1/2] Building CXX object
CMakeFiles/cmTC_e1328.dir/check_tls_opts_127.cc.o
FAILED: CMakeFiles/cmTC_e1328.dir/check_tls_opts_127.cc.o
/usr/lib/ccache/g++ -I/build/cpp/src -I/arrow/cpp/src
-I/arrow/cpp/src/generated -Wno-noexcept-type -fdiagnostics-color=always
-Wall -Wno-conversion -Wno-sign-conversion -Wunused-result -Wdate-time
-fno-semantic-interposition -msse4.2 -g -Werror -O0 -ggdb -fPIE -pthread
-std=c++11 -o CMakeFiles/cmTC_e1328.dir/check_tls_opts_127.cc.o -c
/arrow/cpp/src/arrow/flight/try_compile/check_tls_opts_127.cc
/arrow/cpp/src/arrow/flight/try_compile/check_tls_opts_127.cc: In function
'int main(int, const char**)':
/arrow/cpp/src/arrow/flight/try_compile/check_tls_opts_127.cc:34:39: error:
unused variable 'opt' [-Werror=unused-variable]
34 | grpc_tls_server_verification_option opt = check(nullptr)
| ^~~
cc1plus: all warnings being treated as errors
ninja: build stopped: subcommand failed.
```
### Component(s)
C++, Continuous Integration, Python
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