From f86b00c02e2d30e2a422df22eb0a3f1995c5fc37 Mon Sep 17 00:00:00 2001
From: Pansysk75 <Pansysk75@gmail.com>
Date: Wed, 11 Sep 2024 15:02:44 -0500
Subject: [PATCH] Use find_package to locate HPX-installed Boost

---
 cmake/HPX_SetupBoost.cmake         | 42 ------------------------------
 cmake/templates/HPXConfig.cmake.in | 31 ++++++++++++++--------
 cmake/templates/HPXMacros.cmake.in |  2 +-
 3 files changed, 21 insertions(+), 54 deletions(-)

diff --git a/cmake/HPX_SetupBoost.cmake b/cmake/HPX_SetupBoost.cmake
index 05f5cfcd5614..9e8c74ec449f 100644
--- a/cmake/HPX_SetupBoost.cmake
+++ b/cmake/HPX_SetupBoost.cmake
@@ -15,49 +15,7 @@ if(NOT TARGET hpx_dependencies_boost)
     set(Boost_USE_STATIC_LIBS ON)
   endif()
 
-<<<<<<< HEAD
-  # Add additional version to recognize
-  # cmake-format: off
-  set(Boost_ADDITIONAL_VERSIONS
-      ${Boost_ADDITIONAL_VERSIONS}
-      "1.85.0" "1.85"
-      "1.84.0" "1.84"
-      "1.83.0" "1.83"
-      "1.82.0" "1.82"
-      "1.81.0" "1.81"
-      "1.80.0" "1.80"
-      "1.79.0" "1.79"
-      "1.78.0" "1.78"
-      "1.77.0" "1.77"
-      "1.76.0" "1.76"
-      "1.75.0" "1.75"
-      "1.74.0" "1.74"
-      "1.73.0" "1.73"
-      "1.72.0" "1.72"
-      "1.71.0" "1.71"
-  )
-  # cmake-format: on
-  set(Boost_MINIMUM_VERSION
-      "1.71"
-      CACHE INTERNAL "1.71" FORCE
-  )
-
-  set(Boost_NO_BOOST_CMAKE ON) # disable the search for boost-cmake
-
-  hpx_set_cmake_policy(CMP0167 OLD) # use CMake's FindBoost for now
-
-  # Find the headers and get the version
-  find_package(Boost ${Boost_MINIMUM_VERSION} NO_POLICY_SCOPE MODULE REQUIRED)
-  if(NOT Boost_VERSION_STRING)
-    set(Boost_VERSION_STRING
-        "${Boost_MAJOR_VERSION}.${Boost_MINOR_VERSION}.${Boost_SUBMINOR_VERSION}"
-    )
-  endif()
-
-  set(__boost_libraries "")
-=======
   # set(__boost_libraries disable_autolinking)
->>>>>>> 8d8b4e6456 (Fetch Boost as a CMake subproject)
   if(HPX_PARCELPORT_LIBFABRIC_WITH_LOGGING
      OR HPX_PARCELPORT_LIBFABRIC_WITH_DEV_MODE
   )
diff --git a/cmake/templates/HPXConfig.cmake.in b/cmake/templates/HPXConfig.cmake.in
index 3c5161690bde..ba64cfb6c96d 100644
--- a/cmake/templates/HPXConfig.cmake.in
+++ b/cmake/templates/HPXConfig.cmake.in
@@ -91,6 +91,26 @@ if("${HPX_WITH_DATAPAR_BACKEND}" STREQUAL "SVE")
   endif()
 endif()
 
+if(HPX_WITH_FETCH_BOOST)
+  # Boost has been installed alongside HPX
+  # Let HPX_SetupBoost find it
+  set(HPX_BOOST_ROOT "${CMAKE_CURRENT_LIST_DIR}/../")
+  include(HPX_SetupBoost)
+  include(HPX_SetupBoostFilesystem)
+  include(HPX_SetupBoostIostreams)
+else()
+  # Boost Separate boost targets to be unarily linked to some modules
+  set(HPX_BOOST_ROOT "@Boost_ROOT@")
+  # By default Boost_ROOT is set to HPX_BOOST_ROOT (not necessary for PAPI or
+  # HWLOC cause we are specifying HPX_<lib>_ROOT as an HINT to find_package)
+  if(NOT Boost_ROOT AND NOT "$ENV{BOOST_ROOT}")
+  set(Boost_ROOT ${HPX_BOOST_ROOT})
+  endif()
+  include(HPX_SetupBoost)
+  include(HPX_SetupBoostFilesystem)
+  include(HPX_SetupBoostIostreams)
+endif()
+
 include("${CMAKE_CURRENT_LIST_DIR}/HPXInternalTargets.cmake")
 include("${CMAKE_CURRENT_LIST_DIR}/HPXTargets.cmake")
 
@@ -156,17 +176,6 @@ include(HPX_SetupAllocator)
 
 include(HPX_SetupThreads)
 
-# Boost Separate boost targets to be unarily linked to some modules
-set(HPX_BOOST_ROOT "@Boost_ROOT@")
-# By default Boost_ROOT is set to HPX_BOOST_ROOT (not necessary for PAPI or
-# HWLOC cause we are specifying HPX_<lib>_ROOT as an HINT to find_package)
-if(NOT Boost_ROOT AND NOT "$ENV{BOOST_ROOT}")
-  set(Boost_ROOT ${HPX_BOOST_ROOT})
-endif()
-include(HPX_SetupBoost)
-include(HPX_SetupBoostFilesystem)
-include(HPX_SetupBoostIostreams)
-
 # HIP
 include(HPX_SetupHIP)
 
diff --git a/cmake/templates/HPXMacros.cmake.in b/cmake/templates/HPXMacros.cmake.in
index a3dd7a5f8e13..518aced7c4f9 100644
--- a/cmake/templates/HPXMacros.cmake.in
+++ b/cmake/templates/HPXMacros.cmake.in
@@ -88,7 +88,7 @@ function(hpx_check_compiler_compatibility)
 endfunction()
 
 function(hpx_check_boost_compatibility)
-  if(HPX_IGNORE_BOOST_COMPATIBILITY)
+  if(HPX_IGNORE_BOOST_COMPATIBILITY OR HPX_WITH_FETCH_BOOST)
     return()
   endif()
   if(NOT DEFINED Boost_ROOT)