Reference Boost libraries individually in CMake per docs

[YakoYakoYokuYoku]

Thanks for submitting a pull request! Please provide enough information so that others can review your pull request. Additionally, make sure you've done all of these things:

• I've followed the contributing guidelines to the best of my understanding
• I've read and understood the contributing guidelines
• I've formatted my code according to Natron's code style
• I've searched the pull requests tracker to ensure that this PR is not a duplicate

PR Description

What type of PR is this? (Check one of the boxes below)

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Improvement (non-breaking change which does not add functionality nor fixes a bug but improves Natron in some way)
• Breaking change (fix or feature that would cause existing functionality to change)
• My change requires a change to the documentation
  • I have updated the documentation accordingly

What does this pull request do?

This fixes an annoying policy warning when using CMake. Referencing libraries directly with find_package has been supported way back in Boost.

Show a few screenshots (if this is a visual change)

N/A.

Have you tested your changes (if applicable)? If so, how?

By building and running Natron.

Futher details of this pull request

This might fix issues in other platforms such as BSD related to include directories.

[YakoYakoYokuYoku]

@Martinfx, can you try this PR to see if it does the trick in FreeBSD?

[Martinfx]

@Martinfx, can you try this PR to see if it does the trick in FreeBSD?

I tested your branch on FreeBSD and this is result

maxfx@hades2 ~/D/Natron (boost-cmake-libs)> cmake .
-- The CXX compiler identification is Clang 18.1.6
-- The C compiler identification is Clang 18.1.6
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Setting build type to 'RelWithDebInfo' as none was specified.
CMake Error at CMakeLists.txt:55 (find_package):
  By not providing "Findboost_headers.cmake" in CMAKE_MODULE_PATH this
  project has asked CMake to find a package configuration file provided by
  "boost_headers", but CMake did not find one.

  Could not find a package configuration file provided by "boost_headers"
  with any of the following names:

    boost_headersConfig.cmake
    boost_headers-config.cmake

  Add the installation prefix of "boost_headers" to CMAKE_PREFIX_PATH or set
  "boost_headers_DIR" to a directory containing one of the above files.  If
  "boost_headers" provides a separate development package or SDK, be sure it
  has been installed.

[Martinfx]

@YakoYakoYokuYoku You try to add (if else) for FreeBSD and for Linux

[YakoYakoYokuYoku]

Can you check for both of boost_headers and boost_serialization in your lib/cmake directory? Both of them are in the devel/boost-libs plist, either you don't have those files or FreeBSD does something else for libraries that use CMake.

[Martinfx]

Can you check for both of boost_headers and boost_serialization in your lib/cmake directory? Both of them are in the devel/boost-libs plist, either you don't have those files or FreeBSD does something else for libraries that use CMake.

I am sorry my mistake. I have new installation OS. It is ok.

[devernay]

@YakoYakoYokuYoku I can't find the doc saying that this is the proper way to use boost from cmake.
My BoostConfig.cmake (boost 1.86.0) still contains:

# A typical use might be
#
# find_package(Boost 1.70 REQUIRED COMPONENTS filesystem regex PATHS C:/Boost)

Can you please give us a pointer?
I have the lib/cmake/boost_headers-1.86.0/boost_headers-config.cmake file, but I just can't find the doc that mentions the proper way to use boost

[YakoYakoYokuYoku]

It's way down below in the boostorg/cmake README, seems that when I was copying it I've omitted the fragment, drats.