raulcd commented on PR #48318:
URL: https://github.com/apache/arrow/pull/48318#issuecomment-3608567388
If I apply a patch like on `google-cloud-cpp` I am able to bypass the
problems:
```diff
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -210,7 +210,11 @@ add_custom_target(google-cloud-cpp-protos)
add_custom_target(doxygen-docs)
add_custom_target(all-docfx)
-find_package(absl CONFIG REQUIRED)
+# Allow using absl from FetchContent (targets already exist)
+if(NOT TARGET absl::base)
+ find_package(absl CONFIG REQUIRED)
+endif()
+
if (GOOGLE_CLOUD_CPP_ENABLE_GRPC)
find_package(gRPC REQUIRED QUIET)
# `Protobuf_PROTOC_EXECUTABLE` is pretty standard. It has been in use by
--- a/cmake/IncludeNlohmannJson.cmake
+++ b/cmake/IncludeNlohmannJson.cmake
@@ -15,6 +15,11 @@
# ~~~
function (find_nlohmann_json)
+ # Allow using nlohmann_json from FetchContent (target already exists)
+ if(TARGET nlohmann_json::nlohmann_json)
+ return()
+ endif()
+
find_package(nlohmann_json CONFIG QUIET)
if (nlohmann_json_FOUND)
return()
```
Is not strictly for this PR but wanted to share the full picture as the
current PR is basicaly pre-work for the `google-cloud-cpp` one.
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