[ARROW-1113] [C++] gflags EP build gets triggered (as a no-op) on subsequent calls to make or ninja build

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.4.1
• Fix Version/s: 0.5.0
• Component/s: C++
• External issue URL: https://github.com/apache/arrow/issues/16699
• Assignee: Wes McKinney
• Reporter: Wes McKinney
• Created: 11/Jun/17 21:27
• Updated: 11/Jan/23 07:12
• Resolved: 24/Jun/17 16:21

Description

Since switching to Ninja for builds I've noticed this rough edge. It doesn't seem to affect other EPs. xhochy have you also seen this?

$ ninja
[4/45] Performing configure step for 'gflags_ep'
-- Configuring done
-- Generating done
-- Build files have been written to: /home/wesm/code/arrow/cpp/test-build/gflags_ep-prefix/src/gflags_ep
[5/45] Performing build step for 'gflags_ep'
ninja: no work to do.
[6/45] Performing install step for 'gflags_ep'
[0/1] Install the project...
-- Install configuration: "DEBUG"
-- Up-to-date: /home/wesm/code/arrow/cpp/test-build/gflags_ep-prefix/src/gflags_ep/lib/cmake/gflags/gflags-config.cmake
-- Up-to-date: /home/wesm/code/arrow/cpp/test-build/gflags_ep-prefix/src/gflags_ep/lib/cmake/gflags/gflags-config-version.cmake
-- Up-to-date: /home/wesm/code/arrow/cpp/test-build/gflags_ep-prefix/src/gflags_ep/lib/cmake/gflags/gflags-targets.cmake
-- Installing: /home/wesm/code/arrow/cpp/test-build/gflags_ep-prefix/src/gflags_ep/lib/cmake/gflags/gflags-targets-debug.cmake
-- Up-to-date: /home/wesm/code/arrow/cpp/test-build/gflags_ep-prefix/src/gflags_ep/bin/gflags_completions.sh
[8/45] Building CXX object CMakeFiles/arrow_objlib.dir/src/arrow/ipc/json-internal.cc.o
<SNIP>