[C++] Please have a cmake variable to build with all externally installed dependency packages

[asfimport]

In order to package Arrow, it needs to be possible to use only external dependencies, because the package builder isn't allowed to download any files during build form security reasons, so bundling isn't possible.

 

I am not saying that the build should be radically changed, it should only have a particular cmake variable (ex. USE_EXTERNAL_PACKAGES) that would make it to use only external packages.

 

My particular OS is FreeBSD, but this concern should apply to all systems.

 

Another relevant discussion is here: https://lists.apache.org/thread.html/56e3e5e44901a4ff4f62adc93bb0d34d4c4eac48c993146172e7684e@%3Cdev.arrow.apache.org%3E

 

Reporter: Yuri / @yurivict

Related issues:

• [C++] Use the CMake's standard find features (is related to)

Externally tracked issue: #3668

_{Note: This issue was originally created as ARROW-4607. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
I think this is a duplicate of ARROW-4383. @kou perhaps we can combine these concerns into a single issue?

[asfimport]

Kouhei Sutou / @kou:
Yes. We can resolve this issue by ARROW-4383.
I'll update the status of this issue.

[asfimport]

Kouhei Sutou / @kou:
We can resolve this issue by resolving ARROW-4383.

[asfimport]

Kouhei Sutou / @kou:
I close this issue as "duplicate" of ARROW-4383. But this issue isn't resolved yet.
Please watch ARROW-4383 to see progress of this issue.