[Bug]: ICU4C can't be linked, or way of linking not obvious

[jwbee]

What happened?

I can't figure out how to use the module. The target common:platform globs together all C++ sources, so one cannot use :platform along with any other target, yet all other targets depend on :platform, creating an apparently unavoidable ODR violation, such as this one:

=10007==ERROR: AddressSanitizer: odr-violation (0xec62df9fffe0):
  [1] size=384 'icu_76::LatinCase::TO_LOWER_NORMAL' /proc/self/cwd/external/icu~/icu4c/source/common/ucase.cpp:539 in /root/.cache/bazel/_bazel_root/76ff821df17995dcc346608cc47ffe11/execroot/_main/bazel-out/aarch64-opt/bin/src/test_framework/unit_tests/../../../_solib_aarch64/libexternal_Sicu~_Sicu4c_Ssource_Scommon_Slibucase.so
  [2] size=384 'icu_76::LatinCase::TO_LOWER_NORMAL' /proc/self/cwd/external/icu~/icu4c/source/common/ucase.cpp:539 in /root/.cache/bazel/_bazel_root/76ff821df17995dcc346608cc47ffe11/execroot/_main/bazel-out/aarch64-opt/bin/src/test_framework/unit_tests/../../../_solib_aarch64/libexternal_Sicu~_Sicu4c_Ssource_Scommon_Slibplatform.so

After searching github thoroughly, I can find no users of this module, and active projects that use bazel and ICU, such as zetasql, are still building it with cmake. How is the module to be used, if at all?

Version

Development (host) and target OS/architectures:
Linux jorts 6.8.0-1035-aws #37~22.04.1-Ubuntu SMP Wed Aug 13 13:30:28 UTC 2025 aarch64 aarch64 aarch64 GNU/Linux

Output of bazel --version:
bazel 7.7.1

Language(s) and/or frameworks involved:
C++ w/ LLVM 19

How to reproduce

Any other information?

No response

[phlax]

fwiw, we (envoy) are just moving over to bzlmod - so i was just about to look at using this