From 8a4f5b0afbb4a22b248d9a28a19dd9a141773bbd Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Mon, 9 Feb 2026 12:16:23 -0500
Subject: [PATCH] FindBoost: Add support for Boost 1.91

Update the list of known versions.

Run the command

    cmake -DBOOST_DIR=/path/to/boost_1_91_0 \
      -P Utilities/Scripts/BoostScanDeps.cmake

to extract dependencies from the 1.91.0 source tree.

Dependencies differ from 1.90:

* Boost.Iostreams no longer depends on Boost.Regex
* Boost.Log no longer depends on Boost.Regex

Fixes: #27803
---
 Modules/FindBoost.cmake | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/Modules/FindBoost.cmake b/Modules/FindBoost.cmake
index af11d87c358..3b37cdd7e1a 100644
--- a/Modules/FindBoost.cmake
+++ b/Modules/FindBoost.cmake
@@ -1424,7 +1424,7 @@ function(_Boost_COMPONENT_DEPENDENCIES component _ret)
       set(_Boost_THREAD_DEPENDENCIES chrono atomic)
       set(_Boost_WAVE_DEPENDENCIES filesystem serialization thread chrono atomic)
       set(_Boost_WSERIALIZATION_DEPENDENCIES serialization)
-    else()
+    elseif(Boost_VERSION_STRING VERSION_LESS 1.91.0)
       set(_Boost_COBALT_DEPENDENCIES cobalt_io cobalt_io_ssl container context)
       set(_Boost_CONTRACT_DEPENDENCIES thread chrono)
       set(_Boost_COROUTINE_DEPENDENCIES context)
@@ -1440,7 +1440,22 @@ function(_Boost_COMPONENT_DEPENDENCIES component _ret)
       set(_Boost_THREAD_DEPENDENCIES chrono atomic)
       set(_Boost_WAVE_DEPENDENCIES filesystem serialization thread chrono atomic)
       set(_Boost_WSERIALIZATION_DEPENDENCIES serialization)
-      if(Boost_VERSION_STRING VERSION_GREATER_EQUAL 1.91.0 AND NOT Boost_NO_WARN_NEW_VERSIONS)
+    else()
+      set(_Boost_COBALT_DEPENDENCIES cobalt_io cobalt_io_ssl container context)
+      set(_Boost_CONTRACT_DEPENDENCIES thread chrono)
+      set(_Boost_COROUTINE_DEPENDENCIES context)
+      set(_Boost_FIBER_DEPENDENCIES context)
+      set(_Boost_JSON_DEPENDENCIES container)
+      set(_Boost_LOG_DEPENDENCIES log_setup filesystem thread atomic)
+      set(_Boost_MATH_DEPENDENCIES math_c99 math_c99f math_c99l math_tr1 math_tr1f math_tr1l)
+      set(_Boost_MPI_DEPENDENCIES serialization)
+      set(_Boost_MPI_PYTHON_DEPENDENCIES python${component_python_version} mpi serialization)
+      set(_Boost_NUMPY_DEPENDENCIES python${component_python_version})
+      set(_Boost_PROCESS_DEPENDENCIES filesystem)
+      set(_Boost_THREAD_DEPENDENCIES chrono atomic)
+      set(_Boost_WAVE_DEPENDENCIES filesystem serialization thread chrono atomic)
+      set(_Boost_WSERIALIZATION_DEPENDENCIES serialization)
+      if(Boost_VERSION_STRING VERSION_GREATER_EQUAL 1.92.0 AND NOT Boost_NO_WARN_NEW_VERSIONS)
         message(WARNING "New Boost version may have incorrect or missing dependencies and imported targets")
       endif()
     endif()
@@ -1715,7 +1730,7 @@ else()
   # _Boost_COMPONENT_HEADERS.  See the instructions at the top of
   # _Boost_COMPONENT_DEPENDENCIES.
   set(_Boost_KNOWN_VERSIONS ${Boost_ADDITIONAL_VERSIONS}
-    "1.90.0" "1.90" "1.89.0" "1.89"
+    "1.91.0" "1.91" "1.90.0" "1.90" "1.89.0" "1.89"
     "1.88.0" "1.88" "1.87.0" "1.87" "1.86.0" "1.86" "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"