[PATCH] CMake: Automatically pick up subdirectories in llvm/tools as 'external projects' if they contain a 'CMakeLists.txt' file

[Argyrios Kyrtzidis]

Committed in r188921, thanks for reviewing!

On Aug 21, 2013, at 11:43 AM, Michael Gottesman <mgottesman at apple.com> wrote:

> LGTM
> 
> On Aug 21, 2013, at 9:43 AM, Argyrios Kyrtzidis <kyrtzidis at apple.com> wrote:
> 
>> On Aug 20, 2013, at 11:24 PM, Michael Gottesman <mgottesman at apple.com> wrote:
>> 
>>> Looks much better. One last nit then LGTM. I understand why you would make {add,ignore}_llvm_tool_subdirectory macros since they are so small,
>> 
>> Actually these need to be macros so they can introduce the LLVM_IMPLICIT_PROJECT_IGNORE variable.
>> 
>>> but do you have any reason why you made add_llvm_implicit_external_projects a macro. It seems to me to be more of a function since it:
>>> 
>>> 1. Takes no arguments.
>>> 2. Sets variables which are used only locally suggesting that you want to have the local scope of a function instead of the global scope of a macro.
>> 
>> You're right; changed add_llvm_implicit_external_projects to a function and attached new patch.
>> 
>> <auto-external-proj3.diff>
>> 
>> -Argyrios
>> 
>>> 
>>> Michael
>>> 
>>> On Aug 20, 2013, at 6:00 PM, Argyrios Kyrtzidis <kyrtzidis at apple.com> wrote:
>>> 
>>>> On Aug 20, 2013, at 5:27 PM, Michael Gottesman <mgottesman at apple.com> wrote:
>>>> 
>>>>> Hey Argyrios.
>>>>> 
>>>>> I like the patch, but I think that the name of the variable LLVM_TOOL_SUBDIRS is misleading since you are appending to it subdirectories that are going to explicitly not be included as well as those that will be. I can easily see a tired befuddled programmer getting confused about the meaning of said variable since it violates the expectations that every directory in that variable will include a tool that will be built (I was confused and I am only slightly tired/befuddled).
>>>>> 
>>>>> The real thing you are using said variable for is to act as a signal to add_llvm_implicit_external_projects that it should ignore said subdirectory. Perhaps something like LLVM_IMPLICIT_PROJECT_IGNORE? Even though that name sucks, it at least makes it absolutely clear about the purpose of the variable.
>>>> 
>>>> Yes, that is better, thanks!
>>>> 
>>>> Attached new patch.
>>>> 
>>>> <auto-external-proj2.diff>
>>> 
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