Arch Linux

Dear Maintainer,


Description:

Trying to reproduce the simple example described here: https://pytorch.org/tutorials/advanced/cpp_frontend.html. I realize that the files

/usr/lib64/cmake/Caffe2Config.cmake
/usr/lib64/cmake/Gloo/GlooConfig.cmake
/usr/lib64/cmake/Torch/Config.cmake

have some references (in the comments) to

<install-prefix>/share/cmake/Caffe2Config.cmake
<install-prefix>/share/cmake/Gloo/GlooConfig.cmake
<install-prefix>/share/cmake/Torch/Config.cmake

It makes cmake throwing warnings during configuration. I guess that some paths should be update in the ***Config.cmake files to fit the directory structure of Arch.


Additional info:
* package version(s): 1.5.0-2
* config and/or log files etc.
* link to upstream bug report, if any

Steps to reproduce:


I am compiling the following project with 2 files :

```
dcgan/
CMakeLists.txt
dcgan.cpp
```

The 'CMakeLists.txt' file contains

```
cmake_minimum_required(VERSION 3.0 FATAL_ERROR)
project(dcgan)

set(CMAKE_PREFIX_PATH "/usr/lib/python3.8/site-packages/torch/")
find_package(Torch REQUIRED)

add_executable(dcgan dcgan.cpp)
target_link_libraries(dcgan "${TORCH_LIBRARIES}")
set_property(TARGET dcgan PROPERTY CXX_STANDARD 14)
```

and the main file 'dcgan.cpp' contains
```
#include <torch/torch.h>
#include <iostream>

int main() {
torch::Tensor tensor = torch::eye(3);
std::cout << tensor << std::endl;
}
```

Buildig the project, cmake throw warnings:

```
...

-- Caffe2: Found gflags with new-style gflags target.
-- Caffe2: Cannot find glog automatically. Using legacy find.
CMake Warning (dev) at /usr/share/cmake-3.17/Modules/FindPackageHandleStandardArgs.cmake:272 (message):
The package name passed to `find_package_handle_standard_args` (glog) does
not match the name of the calling package (Caffe2). This can lead to
problems in calling code that expects `find_package` result variables
(e.g., `_FOUND`) to follow a certain pattern.
Call Stack (most recent call first):
/usr/lib64/cmake/Caffe2/public/glog.cmake:49 (find_package_handle_standard_args)
/usr/lib64/cmake/Caffe2/Caffe2Config.cmake:36 (include)
/usr/lib64/cmake/Torch/TorchConfig.cmake:40 (find_package)
CMakeLists.txt:5 (find_package)
This warning is for project developers. Use -Wno-dev to suppress it.

...

CMake Warning (dev) at /usr/share/cmake-3.17/Modules/FindPackageHandleStandardArgs.cmake:272 (message):
The package name passed to `find_package_handle_standard_args` (torch) does
not match the name of the calling package (Torch). This can lead to
problems in calling code that expects `find_package` result variables
(e.g., `_FOUND`) to follow a certain pattern.
Call Stack (most recent call first):
/usr/lib64/cmake/Torch/TorchConfig.cmake:130 (find_package_handle_standard_args)
CMakeLists.txt:5 (find_package)
This warning is for project developers. Use -Wno-dev to suppress it.

...

```