josiahyan commented on a change in pull request #8757:
URL: https://github.com/apache/arrow/pull/8757#discussion_r584312257
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File path: ci/conda_env_unix.yml
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@@ -19,6 +19,8 @@
autoconf
ccache
+google-cloud-cpp=1.20.0
Review comment:
The currently available version in conda (1.24) is incompatible with the
way I initially packaged it. I believe I saw in the CI run that
`storage_client` was missing or something, as the google-cloud-cpp package has
[started namespacing its
exports](https://github.com/googleapis/google-cloud-cpp/blob/5bf147226e9333c5106d5fc8b8bba62657eeab97/google/cloud/storage/legacy.cmake.in#L28)
(finally!).
Given the hard link against abseil libraries (as gRPC does too), to reduce
packaging size, I decided that the version was safer pinned. The abseil
libraries actually loaded probably depends on the matrix of abseil versions and
users of it (gRPC, and the proposed google-cloud-cpp inclusion). Personally, I
[extract it by a bazel
query](https://github.com/apache/arrow/blob/7076b4c75c6981dac7b9e11e5661260cb7ddedf5/cpp/cmake_modules/ThirdpartyToolchain.cmake#L2397)
(provided in comments) and a Python script to lookup the symbols in the ar
files. I believe the gRPC builds do something similar, or just pull them out
from the compiler invocations (does @pitrou or @kou know how they were
determined in commits like
[these](https://github.com/apache/arrow/commit/4ecac056dfa88a0032fed7f36a20d2886c39ef90)?).
Ideally the compiler would do the dead section elimination, but I didn't dig
into why the build system wouldn't allow so (I'm guessing the libs have to
bundled in and linked separately som
ehow?).
I'm hoping to upgrade the dependency when there is code using it (which
would be the GCS implementation of the Arrow file interfaces).
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