From 7224bced8bff9d16d5e869d44f90f95ad8fdfe25 Mon Sep 17 00:00:00 2001
From: Samaresh Kumar Singh <ssam3003@gmail.com>
Date: Sat, 8 Nov 2025 09:16:11 -0600
Subject: [PATCH] Fix #27961: Support reproducible builds by making host system
 version optional

Add BUILD_INFO_SKIP_SYSTEM_VERSION option to exclude the host kernel version
from build outputs, enabling reproducible builds across systems with different
kernel versions.

Changes:
- Modified CMakeLists.txt to conditionally include CMAKE_HOST_SYSTEM_VERSION
  in the build platform status based on BUILD_INFO_SKIP_SYSTEM_VERSION flag
- Updated 3rdparty/tbb/CMakeLists.txt to set TBB_HOST_VERSION conditionally
- Modified 3rdparty/tbb/version_string.ver.cmakein to use the new variable

When BUILD_INFO_SKIP_SYSTEM_VERSION=ON is set, the host system version is
excluded from both the CMake status output and the TBB version strings,
producing identical binaries on equivalent build systems regardless of
kernel version differences.

Default behavior is unchanged (version included) for backward compatibility.

Fixes #27961
---
 3rdparty/tbb/CMakeLists.txt             | 5 +++++
 3rdparty/tbb/version_string.ver.cmakein | 2 +-
 CMakeLists.txt                          | 6 +++++-
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/3rdparty/tbb/CMakeLists.txt b/3rdparty/tbb/CMakeLists.txt
index 10f60094ae..2d25a3a08e 100644
--- a/3rdparty/tbb/CMakeLists.txt
+++ b/3rdparty/tbb/CMakeLists.txt
@@ -106,6 +106,11 @@ ocv_warnings_disable(CMAKE_CXX_FLAGS
 set(TBB_SOURCE_FILES ${lib_srcs} ${lib_hdrs})
 
 set(tbb_version_file "version_string.ver")
+if(NOT BUILD_INFO_SKIP_SYSTEM_VERSION)
+  set(TBB_HOST_VERSION " ${CMAKE_HOST_SYSTEM_VERSION}")
+else()
+  set(TBB_HOST_VERSION "")
+endif()
 configure_file("${CMAKE_CURRENT_SOURCE_DIR}/${tbb_version_file}.cmakein" "${CMAKE_CURRENT_BINARY_DIR}/${tbb_version_file}" @ONLY)
 list(APPEND TBB_SOURCE_FILES "${CMAKE_CURRENT_BINARY_DIR}/${tbb_version_file}")
 
diff --git a/3rdparty/tbb/version_string.ver.cmakein b/3rdparty/tbb/version_string.ver.cmakein
index 1f8f0b818d..2953c1bc0c 100644
--- a/3rdparty/tbb/version_string.ver.cmakein
+++ b/3rdparty/tbb/version_string.ver.cmakein
@@ -1,6 +1,6 @@
 #define __TBB_VERSION_STRINGS(N) \
 #N": BUILD_PACKAGE	OpenCV @OPENCV_VERSION@" ENDL \
-#N": BUILD_HOST 	@CMAKE_HOST_SYSTEM_NAME@ @CMAKE_HOST_SYSTEM_VERSION@ @CMAKE_HOST_SYSTEM_PROCESSOR@" ENDL \
+#N": BUILD_HOST 	@CMAKE_HOST_SYSTEM_NAME@@TBB_HOST_VERSION@ @CMAKE_HOST_SYSTEM_PROCESSOR@" ENDL \
 #N": BUILD_TARGET	@CMAKE_SYSTEM_NAME@ @CMAKE_SYSTEM_VERSION@ @CMAKE_SYSTEM_PROCESSOR@" ENDL \
 #N": BUILD_COMPILER	@CMAKE_CXX_COMPILER@ (ver @CMAKE_CXX_COMPILER_VERSION@)" ENDL \
 #N": BUILD_COMMAND	use cv::getBuildInformation() for details" ENDL
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 54223fb1db..cc93888c93 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1240,7 +1240,11 @@ endif()
 if(OPENCV_TIMESTAMP)
   status("    Timestamp:"      ${OPENCV_TIMESTAMP})
 endif()
-status("    Host:"             ${CMAKE_HOST_SYSTEM_NAME} ${CMAKE_HOST_SYSTEM_VERSION} ${CMAKE_HOST_SYSTEM_PROCESSOR})
+if(NOT BUILD_INFO_SKIP_SYSTEM_VERSION)
+  status("    Host:"             ${CMAKE_HOST_SYSTEM_NAME} ${CMAKE_HOST_SYSTEM_VERSION} ${CMAKE_HOST_SYSTEM_PROCESSOR})
+else()
+  status("    Host:"             ${CMAKE_HOST_SYSTEM_NAME} ${CMAKE_HOST_SYSTEM_PROCESSOR})
+endif()
 if(CMAKE_CROSSCOMPILING)
   status("    Target:"         ${CMAKE_SYSTEM_NAME} ${CMAKE_SYSTEM_VERSION} ${CMAKE_SYSTEM_PROCESSOR})
 endif()