[ORC-640] [C++] Support consumption as CMake submodule

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: C++
• Assignee: Unassigned
• Reporter: Gang Wu
• Created: 10/Jun/20 04:23
• Updated: 10/Jun/20 04:25

Description

Consuming Apache ORC in a C++ project as CMake submodule (via add_subdirectory) currently causes two issues:

• A warning about CMake policy CMP0048 not being set, which cannot be suppressed from the outside:

 

{{CMake Warning (dev) at third_party/orc/CMakeLists.txt:15 (project):
Policy CMP0048 is not set: project() command manages VERSION variables.
Run "cmake --help-policy CMP0048" for policy details. Use the cmake_policy
command to set the policy and suppress this warning.

The following variable(s) would be set to empty:

PROJECT_VERSION
PROJECT_VERSION_MAJOR
PROJECT_VERSION_MINOR
PROJECT_VERSION_PATCH
This warning is for project developers. Use -Wno-dev to suppress it.}}

• Errors about CMake modules not being found:

 

{{CMake Error at third_party/orc/CMakeLists.txt:116 (INCLUDE):
INCLUDE could not find load file:

CheckSourceCompiles

CMake Error at third_party/orc/CMakeLists.txt:117 (INCLUDE):
INCLUDE could not find load file:

ThirdpartyToolchain}}

Issue Links

• links to: GitHub Pull Request #510
• links to: https://github.com/apache/orc/pull/510