[cmake-developers] install(EXCLUDE_FROM_ALL) new feature - request for comment

[Nick Lewis]

>>>There is currently no way to exclude a component install() from a full
>>>installation. Current workarounds using OPTIONAL do not work reliably
because
>>>they depend on previous builds and on the order execution of the build
and
>>>install commands for the components and the default target

>>>Steps to Reproduce:
>>>make
>>>make tests
>>>make install
>>>DESTDIR=/testpkgs make install-tests

>>>This results in test components in the default installation as well as
the
>>>testpkg

>>>Judging by questions on the mail list, users typically try to overcome
this
>>>problem by adding the unsupported EXCLUDE_FROM_ALL keyword to the install
>>>command

 >>> http://www.cmake.org/Bug/view.php?id=14921

>>Interesting proposal.  I think a change along these lines could also
improve a
>>case mentioned in the install() command documentation:

>> http://www.cmake.org/cmake/help/v3.0/command/install.html
>> "Installing a target with the EXCLUDE_FROM_ALL target property set to
TRUE has
>>undefined behavior."

>>That refers to the use case when a target build is EXCLUDE_FROM_ALL and
so is
>>not created by "make" and may then be missing when "make install" is
issued.
>>This looks intended to support the same use case by making the install
rule
>>excluded from the default installation too.  Perhaps install(TARGETS)
should
>>activate ExcludeFromAll when the corresponding property is set on the
target.


>Rebased patch on 3.2.2. Still no automatic setting of
install(EXCLUDE_FROM_ALL)
>based on the setting of add_executable(EXCLUDE_FROM_ALL) though

Thanks for working on this.  I think it will be better discussed on the
cmake-developers mailing list:

 http://www.cmake.org/mailman/listinfo/cmake-developers

That allows for design discussion with a broader audience than the issue

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