tadeja commented on code in PR #50085:
URL: https://github.com/apache/arrow/pull/50085#discussion_r3358244375
##########
.github/workflows/cpp_extra.yml:
##########
@@ -554,10 +554,19 @@ jobs:
ARROW_FLIGHT_SQL_ODBC: ON
ARROW_FLIGHT_SQL_ODBC_INSTALLER: ON
ARROW_HOME: /usr
+ # GH-49465: work around the gRPC/Abseil exit hang on Windows
+ # https://github.com/grpc/grpc/issues/39321
+ # https://github.com/abseil/abseil-cpp/issues/1877
+ # Build Arrow with GPR_DISABLE_ABSEIL_SYNC so grpcpp's Mutex ABI
+ # matches the gRPC rebuilt by the overlay triplet. Remove once fixed
upstream.
+ ARROW_CXXFLAGS: -DGPR_DISABLE_ABSEIL_SYNC
Review Comment:
cl.exe also accepts `-D...`:
https://github.com/apache/arrow/actions/runs/26965144128/job/79565799445?pr=50085#step:12:9943
`-- CMAKE_CXX_FLAGS: /D_SILENCE_TR1_... ... /arch:SSE4.2
-DGPR_DISABLE_ABSEIL_SYNC`
While [`/D...`
actually](https://github.com/tadeja/arrow/actions/runs/26693899706/job/78678915530#step:12:17)
caused [build
failure](https://github.com/tadeja/arrow/actions/runs/26693899706/job/78678915530#step:12:2879)
earlier on my fork CI
```
c1xx: fatal error C1083: Cannot open source file: 'C:/Program': No such file
or directory DGPR_DISABLE_ABSEIL_SYNC
c1xx: fatal error C1083: Cannot open source file:
'Files/Git/DGPR_DISABLE_ABSEIL_SYNC': No such file or directory
```
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