Fail to use FindBoost

[zjyhjqs]

Environment: CMake 3.30, windows x64

I installed boost with options (just need header-only part):

• BOOST_ENABLE_COMPATIBILITY_TARGETS: true
• BOOST_EXCLUDE_LIBRARIES: "atomic;charconv;chrono;cobalt;container;context;contract;coroutine;date_time;exception;fiber;filesystem;graph;graph_parallel;iostreams;json;locale;log;math;mpi;mysql;nowide;process;program_options;python;random;regex;serialization;stacktrace;system;test;thread;timer;type_erasure;url;wave;predef"

Then I tried to use it in my project (having set the Boost_ROOT):

cmake_minimum_required(VERSION 3.30)
project(CMakeTest LANGUAGES CXX)

find_package(Boost REQUIRED)

The error message:

CMake Error at X:/Boost-1.86.0/lib/cmake/Boost-1.86.0/BoostConfig.cmake:67 (find_package):
  Found package configuration file:

    X:/Boost-1.86.0/lib/cmake/boost_headers-1.86.0/boost_headers-config.cmake

  but it set boost_headers_FOUND to FALSE so package "boost_headers" is
  considered to be NOT FOUND.  Reason given by package:

  The following imported targets are referenced, but are missing:
  Boost::accumulators Boost::algorithm Boost::align Boost::any Boost::array
  Boost::asio Boost::assert Boost::assign Boost::beast Boost::bimap
  Boost::bind Boost::callable_traits Boost::circular_buffer Boost::compat
  Boost::compatibility Boost::compute Boost::concept_check Boost::config
  Boost::container_hash Boost::conversion Boost::convert Boost::core
  Boost::coroutine2 Boost::crc Boost::describe Boost::detail Boost::dll
  Boost::dynamic_bitset Boost::endian Boost::flyweight Boost::foreach
  Boost::format Boost::function Boost::function_types Boost::functional
  Boost::fusion Boost::geometry Boost::gil Boost::hana Boost::heap
  Boost::histogram Boost::hof Boost::icl Boost::integer Boost::interprocess
  Boost::intrusive Boost::io Boost::iterator Boost::lambda Boost::lambda2
  Boost::leaf Boost::lexical_cast Boost::local_function Boost::lockfree
  Boost::logic Boost::metaparse Boost::move Boost::mp11 Boost::mpl Boost::msm
  Boost::multi_array Boost::multi_index Boost::multiprecision Boost::optional
  Boost::outcome Boost::parameter Boost::pfr Boost::phoenix
  Boost::poly_collection Boost::polygon Boost::pool Boost::preprocessor
  Boost::property_map Boost::property_tree Boost::proto Boost::ptr_container
  Boost::qvm Boost::range Boost::ratio Boost::rational Boost::redis
  Boost::safe_numerics Boost::scope Boost::scope_exit Boost::signals2
  Boost::smart_ptr Boost::sort Boost::spirit Boost::statechart
  Boost::static_assert Boost::static_string Boost::stl_interfaces
  Boost::throw_exception Boost::tokenizer Boost::tti Boost::tuple
  Boost::type_index Boost::type_traits Boost::typeof Boost::units
  Boost::unordered Boost::utility Boost::uuid Boost::variant Boost::variant2
  Boost::vmd Boost::winapi Boost::xpressive Boost::yap

Call Stack (most recent call first):
  X:/Boost-1.86.0/lib/cmake/Boost-1.86.0/BoostConfig.cmake:97 (boostcfg_find_component)
  CMakeLists.txt:4 (find_package)

---

Seems the dependencies of Boost::headers haven't been imported yet. https://github.com/boostorg/cmake/blob/bb741d09d2cb12f3934896880c6ecaf6de4ba707/config/BoostConfig.cmake#L97

[pdimov]

You shouldn't set BOOST_ENABLE_COMPATIBILITY_TARGETS when installing; it's only needed for add_subdirectory/FetchContent use.

[zjyhjqs]

OK, it's working.

May BOOST_ENABLE_COMPATIBILITY_TARGETS should be documented.