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

["Wes McKinney (JIRA)" <ji...@apache.org>]

Wes McKinney created ARROW-1113:
-----------------------------------

             Summary: [C++] gflags EP build gets triggered (as a no-op) on subsequent calls to make or ninja build
                 Key: ARROW-1113
                 URL: https://issues.apache.org/jira/browse/ARROW-1113
             Project: Apache Arrow
          Issue Type: Bug
          Components: C++
    Affects Versions: 0.4.1
            Reporter: Wes McKinney


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? 

{code}
$ 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>
{code}



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