[ARROW-747] [C++] Fix spurious warning caused by passing dl to add_dependencies

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.3.0
• Component/s: C++
• External issue URL: https://github.com/apache/arrow/issues/16363
• Assignee: Wes McKinney
• Reporter: Wes McKinney
• Created: 31/Mar/17 17:46
• Updated: 11/Jan/23 07:10
• Resolved: 02/Apr/17 08:04

Description

There is a potentially confusing warning from arrow/io on Linux:

-- Configuring done
CMake Warning (dev) at cmake_modules/BuildUtils.cmake:98 (add_dependencies):
  Policy CMP0046 is not set: Error on non-existent dependency in
  add_dependencies.  Run "cmake --help-policy CMP0046" for policy details.
  Use the cmake_policy command to set the policy and suppress this warning.

  The dependency target "dl" of target "arrow_io_objlib" does not exist.
Call Stack (most recent call first):
  src/arrow/io/CMakeLists.txt:85 (ADD_ARROW_LIB)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Generating done
-- Build files have been written to: /home/wesm/code/arrow/cpp/test-build

I believe you may need to link to libdl on OS X

Issue Links

• blocks: ARROW-670 Arrow 0.3 release