[llvm-dev] FYI: Ninja-build user may use CMake-3.9

[Martell Malone via llvm-dev]

Hey Takumi ,

Seen as this is related to 3.9. What are your thoughts on how to update the
variables to solve this
Will we just add the policy to cmake or change RPATH on macos behave
differently?

```
CMake Warning (dev):
  Policy CMP0068 is not set: RPATH settings on macOS do not affect
  install_name.  Run "cmake --help-policy CMP0068" for policy details.  Use
  the cmake_policy command to set the policy and suppress this warning.
  For compatibility with older versions of CMake, the install_name fields
for
  the following targets are still affected by RPATH settings:
   LTO
   libclang
This warning is for project developers.  Use -Wno-dev to suppress it.
```

This is from an MacOS host building clang with cmake 3.9 and ninja

On Fri, Jul 21, 2017 at 12:07 AM, NAKAMURA Takumi via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

>
>
> On Fri, Jul 21, 2017 at 1:16 AM Reid Kleckner <rnk at google.com> wrote:
>
>> This is great news! Do we know who contributed the changes to cut the
>> extra library dependencies?
>>
>> Do you think we should remove ENABLE_OBJLIB to simplify our CMake files
>> in the near future? It seems to me that anyone who cares about highly
>> parallel build throughput can upgrade CMake to get the good behavior. It's
>> probably easier and less error-prone than maintaining a special build
>> configuration.
>>
>
> At the moment, this facility (loose deps) is specific to Ninja generator.
> There are a couple of users of ENABLE_OBJLIB.
> - Tablegen (except for ninja).
> - LIBCLANG_BUILD_STATIC. It doesn't use LLVM_ENABLE_OBJLIB, but uses it
> internally.
>
> Thanks,
> Takumi
>
>
>
>> On Thu, Jul 20, 2017 at 8:31 AM, NAKAMURA Takumi via llvm-dev <
>> llvm-dev at lists.llvm.org> wrote:
>>
>>> This is useful for developer who uses multicore builder.
>>> https://cmake.org/cmake/help/v3.9/release/3.9.html#other-changes
>>>
>>>
>>>    - The Ninja
>>>    <https://cmake.org/cmake/help/v3.9/generator/Ninja.html#generator:Ninja> generator
>>>    has loosened the dependencies of object compilation. Object compilation now
>>>    depends only on custom targets and custom commands associated with
>>>    libraries on which the object’s target depends and no longer depends on the
>>>    libraries themselves. Source files in dependent targets may now compile
>>>    without waiting for their targets’ dependencies to link.
>>>
>>> With BUILD_SHARED_LIBS, compiling units don't wait for preceding shared
>>> libs.
>>> See also; http://bb.pgr.jp/builders/i686-mingw32-RA-on-linux
>>> Regardless of BUILD_SHARED_LIBS, compile units in add_executable() don't
>>> wait for preceding libraries,
>>> but targets by add_dependencies().
>>>
>>> It doesn't break anything in llvm tree. Assume;
>>>   add_executable(foo foo.cpp)
>>>   target_link_libraries(foo LLVMCore) # depends on intrinsics_gen
>>> Compiling foo.cpp doesn't wait for LLVMCore, but intrinsics_gen.
>>> Linking foo waits for LLVMCore.
>>>
>>> I have been working for cutting dependencies to increase parallelism.
>>> For example, I introduced ENABLE_OBJLIB.
>>> See also, https://reviews.llvm.org/rL305635
>>> Ninja with CMake-3.9 doesn't require parallelize with objlib.
>>>
>>> I love ninja-build.
>>>
>>> Thanks,
>>> Takumi
>>>
>>> _______________________________________________
>>> LLVM Developers mailing list
>>> llvm-dev at lists.llvm.org
>>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>>
>>>
>>
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