From 0dbcfc5bd2eaacf8be4f57f8b7cc7369d88fafa8 Mon Sep 17 00:00:00 2001
From: "Daniel E @diizzyy" <unknown@example.com>
Date: Sun, 20 Oct 2024 22:45:15 +0200
Subject: [PATCH] CMake: fix build with LLVM/Clang 17+

Fixes #651
---
 cmake/LinkerChecks.cmake | 7 ++++++-
 libtiff/CMakeLists.txt   | 9 +++++++--
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/cmake/LinkerChecks.cmake b/cmake/LinkerChecks.cmake
index ad1f0f9ff..90496bd2e 100644
--- cmake/LinkerChecks.cmake
+++ cmake/LinkerChecks.cmake
@@ -39,7 +39,12 @@ VERS_2 {
 } VERS_1;
 ")
 set(CMAKE_REQUIRED_FLAGS_SAVE ${CMAKE_REQUIRED_FLAGS})
-set(CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS} "-Wl,--version-script=${CMAKE_CURRENT_BINARY_DIR}/conftest.map")
+if (CMAKE_VERSION GREATER_EQUAL 3.29 AND CMAKE_C_COMPILER_LINKER_ID STREQUAL "LLD" AND CMAKE_C_COMPILER_LINKER_VERSION GREATER_EQUAL 17)
+    set(CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS} -Wl,--undefined-version "-Wl,--version-script=${CMAKE_CURRENT_BINARY_DIR}/conftest.map")
+else()
+    set(CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS} "-Wl,--version-script=${CMAKE_CURRENT_BINARY_DIR}/conftest.map")
+endif()
+
 check_c_source_compiles("int main(void){return 0;}" HAVE_LD_VERSION_SCRIPT)
 set(CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS_SAVE})
 file(REMOVE "${CMAKE_CURRENT_BINARY_DIR}/conftest.map")
diff --git a/libtiff/CMakeLists.txt b/libtiff/CMakeLists.txt
index a8aa0c320..2762fab7c 100755
--- libtiff/CMakeLists.txt
+++ libtiff/CMakeLists.txt
@@ -201,8 +201,13 @@ if(NOT CYGWIN)
     set_target_properties(tiff PROPERTIES VERSION ${SO_VERSION})
 endif()
 if(HAVE_LD_VERSION_SCRIPT)
-  set_target_properties(tiff PROPERTIES LINK_FLAGS
-                        "-Wl,--version-script=${CMAKE_CURRENT_SOURCE_DIR}/libtiff.map")
+  if (CMAKE_VERSION GREATER_EQUAL 3.29 AND CMAKE_C_COMPILER_LINKER_ID STREQUAL "LLD" AND CMAKE_C_COMPILER_LINKER_VERSION GREATER_EQUAL 17)
+    set_target_properties(tiff PROPERTIES LINK_FLAGS
+                              "-Wl,--undefined-version -Wl,--version-script=${CMAKE_CURRENT_SOURCE_DIR}/libtiff.map")
+  else()
+    set_target_properties(tiff PROPERTIES LINK_FLAGS
+                              "-Wl,--version-script=${CMAKE_CURRENT_SOURCE_DIR}/libtiff.map")
+  endif()
 endif()
 
 if(tiff-install)
-- 
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