LLD linker: avoid regression on archive libraries deduplication

Due to a bug on LLD linker for ELF binaries, deduplication should
occur only if CMP0156 and CMP0179 are NEW.

Fixes: #26447

37 files changed, 70 insertions, 1 deletions

diff --git a/Modules/Platform/Linker/AIX-AIX.cmake b/Modules/Platform/Linker/AIX-AIX.cmake
index 36d7959..553168b 100644
--- a/Modules/Platform/Linker/AIX-AIX.cmake
+++ b/Modules/Platform/Linker/AIX-AIX.cmake
@@ -6,5 +6,6 @@
 include_guard()
 
 macro(__aix_linker_aix lang)
+  set(CMAKE_${lang}_PLATFORM_LINKER_ID AIX)
   set(CMAKE_${lang}_LINK_LIBRARIES_PROCESSING ORDER=REVERSE DEDUPLICATION=ALL)
 endmacro()
diff --git a/Modules/Platform/Linker/Apple-AppleClang.cmake b/Modules/Platform/Linker/Apple-AppleClang.cmake
index 7582ae9..643cbbd 100644
--- a/Modules/Platform/Linker/Apple-AppleClang.cmake
+++ b/Modules/Platform/Linker/Apple-AppleClang.cmake
@@ -6,6 +6,7 @@
 include_guard()
 
 macro(__apple_linker_appleclang lang)
+  set(CMAKE_${lang}_PLATFORM_LINKER_ID AppleClang)
   set(CMAKE_${lang}_LINK_LIBRARIES_PROCESSING ORDER=REVERSE DEDUPLICATION=ALL)
 
   # Features for LINK_LIBRARY generator expression
diff --git a/Modules/Platform/Linker/Apple-LLD-C.cmake b/Modules/Platform/Linker/Apple-LLD-C.cmake
index e38b1b7..64d9591 100644
--- a/Modules/Platform/Linker/Apple-LLD-C.cmake
+++ b/Modules/Platform/Linker/Apple-LLD-C.cmake
@@ -2,3 +2,5 @@
 # file Copyright.txt or https://cmake.org/licensing for details.
 
 include(Platform/Linker/Apple-AppleClang-C)
+
+set(CMAKE_C_PLATFORM_LINKER_ID LLD)
diff --git a/Modules/Platform/Linker/Apple-LLD-CXX.cmake b/Modules/Platform/Linker/Apple-LLD-CXX.cmake
index 4e4a9ca..deaa558 100644
--- a/Modules/Platform/Linker/Apple-LLD-CXX.cmake
+++ b/Modules/Platform/Linker/Apple-LLD-CXX.cmake
@@ -2,3 +2,5 @@
 # file Copyright.txt or https://cmake.org/licensing for details.
 
 include(Platform/Linker/Apple-AppleClang-CXX)
+
+set(CMAKE_CXX_PLATFORM_LINKER_ID LLD)
diff --git a/Modules/Platform/Linker/Apple-LLD-OBJC.cmake b/Modules/Platform/Linker/Apple-LLD-OBJC.cmake
index ff18785..1879034 100644
--- a/Modules/Platform/Linker/Apple-LLD-OBJC.cmake
+++ b/Modules/Platform/Linker/Apple-LLD-OBJC.cmake
@@ -2,3 +2,5 @@
 # file Copyright.txt or https://cmake.org/licensing for details.
 
 include(Platform/Linker/Apple-AppleClang-OBJC)
+
+set(CMAKE_OBJC_PLATFORM_LINKER_ID LLD)
diff --git a/Modules/Platform/Linker/Apple-LLD-OBJCXX.cmake b/Modules/Platform/Linker/Apple-LLD-OBJCXX.cmake
index ba92890..71844d9 100644
--- a/Modules/Platform/Linker/Apple-LLD-OBJCXX.cmake
+++ b/Modules/Platform/Linker/Apple-LLD-OBJCXX.cmake
@@ -2,3 +2,5 @@
 # file Copyright.txt or https://cmake.org/licensing for details.
 
 include(Platform/Linker/Apple-AppleClang-OBJCXX)
+
+set(CMAKE_OBJCXX_PLATFORM_LINKER_ID LLD)
diff --git a/Modules/Platform/Linker/Apple-MOLD-C.cmake b/Modules/Platform/Linker/Apple-MOLD-C.cmake
index e38b1b7..14347bb 100644
--- a/Modules/Platform/Linker/Apple-MOLD-C.cmake
+++ b/Modules/Platform/Linker/Apple-MOLD-C.cmake
@@ -2,3 +2,5 @@
 # file Copyright.txt or https://cmake.org/licensing for details.
 
 include(Platform/Linker/Apple-AppleClang-C)
+
+set(CMAKE_C_PLATFORM_LINKER_ID MOLD)
diff --git a/Modules/Platform/Linker/Apple-MOLD-CXX.cmake b/Modules/Platform/Linker/Apple-MOLD-CXX.cmake
index 4e4a9ca..416b8b5 100644
--- a/Modules/Platform/Linker/Apple-MOLD-CXX.cmake
+++ b/Modules/Platform/Linker/Apple-MOLD-CXX.cmake
@@ -2,3 +2,5 @@
 # file Copyright.txt or https://cmake.org/licensing for details.
 
 include(Platform/Linker/Apple-AppleClang-CXX)
+
+set(CMAKE_CXX_PLATFORM_LINKER_ID MOLD)
diff --git a/Modules/Platform/Linker/Apple-MOLD-OBJC.cmake b/Modules/Platform/Linker/Apple-MOLD-OBJC.cmake
index ff18785..e18281b 100644
--- a/Modules/Platform/Linker/Apple-MOLD-OBJC.cmake
+++ b/Modules/Platform/Linker/Apple-MOLD-OBJC.cmake
@@ -2,3 +2,5 @@
 # file Copyright.txt or https://cmake.org/licensing for details.
 
 include(Platform/Linker/Apple-AppleClang-OBJC)
+
+set(CMAKE_OBJC_PLATFORM_LINKER_ID MOLD)
diff --git a/Modules/Platform/Linker/Apple-MOLD-OBJCXX.cmake b/Modules/Platform/Linker/Apple-MOLD-OBJCXX.cmake
index ba92890..3a7d48d 100644
--- a/Modules/Platform/Linker/Apple-MOLD-OBJCXX.cmake
+++ b/Modules/Platform/Linker/Apple-MOLD-OBJCXX.cmake
@@ -2,3 +2,5 @@
 # file Copyright.txt or https://cmake.org/licensing for details.
 
 include(Platform/Linker/Apple-AppleClang-OBJCXX)
+
+set(CMAKE_OBJCXX_PLATFORM_LINKER_ID MOLD)
diff --git a/Modules/Platform/Linker/CYGWIN-GNU.cmake b/Modules/Platform/Linker/CYGWIN-GNU.cmake
index 8e5b970..0ac407f 100644
--- a/Modules/Platform/Linker/CYGWIN-GNU.cmake
+++ b/Modules/Platform/Linker/CYGWIN-GNU.cmake
@@ -8,6 +8,7 @@ include_guard()
 include(Platform/Linker/GNU)
 
 macro(__cygwin_linker_gnu lang)
+  set(CMAKE_${lang}_PLATFORM_LINKER_ID GNU)
   if(CMAKE_${lang}_COMPILER_LINKER)
     __cmake_set_whole_archive_feature("${CMAKE_${lang}_COMPILER_LINKER}" "${lang}")
   endif()
diff --git a/Modules/Platform/Linker/CYGWIN-LLD.cmake b/Modules/Platform/Linker/CYGWIN-LLD.cmake
index 39a3c59..1b637e2 100644
--- a/Modules/Platform/Linker/CYGWIN-LLD.cmake
+++ b/Modules/Platform/Linker/CYGWIN-LLD.cmake
@@ -12,5 +12,6 @@ include(Platform/Linker/CYGWIN-GNU)
 macro(__cygwin_linker_lld lang)
   __cygwin_linker_gnu(${lang})
 
+  set(CMAKE_${lang}_PLATFORM_LINKER_ID LLD)
   set(CMAKE_${lang}_LINK_LIBRARIES_PROCESSING ORDER=REVERSE DEDUPLICATION=ALL)
 endmacro()
diff --git a/Modules/Platform/Linker/FreeBSD-GNU.cmake b/Modules/Platform/Linker/FreeBSD-GNU.cmake
index f884857..5b26c03 100644
--- a/Modules/Platform/Linker/FreeBSD-GNU.cmake
+++ b/Modules/Platform/Linker/FreeBSD-GNU.cmake
@@ -8,6 +8,7 @@ include_guard()
 include(Platform/Linker/GNU)
 
 macro(__freebsd_linker_gnu lang)
+  set(CMAKE_${lang}_PLATFORM_LINKER_ID GNU)
   if(CMAKE_${lang}_COMPILER_LINKER)
     __cmake_set_whole_archive_feature("${CMAKE_${lang}_COMPILER_LINKER}" "${lang}")
   endif()
diff --git a/Modules/Platform/Linker/FreeBSD-LLD.cmake b/Modules/Platform/Linker/FreeBSD-LLD.cmake
index 133f80c..19f4df5 100644
--- a/Modules/Platform/Linker/FreeBSD-LLD.cmake
+++ b/Modules/Platform/Linker/FreeBSD-LLD.cmake
@@ -12,5 +12,6 @@ include(Platform/Linker/FreeBSD-GNU)
 macro(__freebsd_linker_lld lang)
   __freebsd_linker_gnu(${lang})
 
+  set(CMAKE_${lang}_PLATFORM_LINKER_ID LLD)
   set(CMAKE_${lang}_LINK_LIBRARIES_PROCESSING ORDER=REVERSE DEDUPLICATION=ALL)
 endmacro()
diff --git a/Modules/Platform/Linker/GNU-GNU.cmake b/Modules/Platform/Linker/GNU-GNU.cmake
index a1adf14..274b876 100644
--- a/Modules/Platform/Linker/GNU-GNU.cmake
+++ b/Modules/Platform/Linker/GNU-GNU.cmake
@@ -8,6 +8,7 @@ include_guard()
 include(Platform/Linker/GNU)
 
 macro(__gnu_linker_gnu lang)
+  set(CMAKE_${lang}_PLATFORM_LINKER_ID GNU)
   if(CMAKE_${lang}_COMPILER_LINKER)
     __cmake_set_whole_archive_feature("${CMAKE_${lang}_COMPILER_LINKER}" "${lang}")
   endif()
diff --git a/Modules/Platform/Linker/Linux-GNU.cmake b/Modules/Platform/Linker/Linux-GNU.cmake
index 6668141..0cffafb 100644
--- a/Modules/Platform/Linker/Linux-GNU.cmake
+++ b/Modules/Platform/Linker/Linux-GNU.cmake
@@ -8,6 +8,7 @@ include_guard()
 include(Platform/Linker/GNU)
 
 macro(__linux_linker_gnu lang)
+  set(CMAKE_${lang}_PLATFORM_LINKER_ID GNU)
   if(CMAKE_${lang}_COMPILER_LINKER)
     __cmake_set_whole_archive_feature("${CMAKE_${lang}_COMPILER_LINKER}" "${lang}")
   endif()
diff --git a/Modules/Platform/Linker/Linux-GNUgold-ASM.cmake b/Modules/Platform/Linker/Linux-GNUgold-ASM.cmake
index bfef8b9..54b4554 100644
--- a/Modules/Platform/Linker/Linux-GNUgold-ASM.cmake
+++ b/Modules/Platform/Linker/Linux-GNUgold-ASM.cmake
@@ -2,3 +2,5 @@
 # file Copyright.txt or https://cmake.org/licensing for details.
 
 include(Platform/Linker/Linux-GNU-ASM)
+
+set(CMAKE_ASM_PLATFORM_LINKER_ID GNUgold)
diff --git a/Modules/Platform/Linker/Linux-GNUgold-C.cmake b/Modules/Platform/Linker/Linux-GNUgold-C.cmake
index 2d0efda..929ac88 100644
--- a/Modules/Platform/Linker/Linux-GNUgold-C.cmake
+++ b/Modules/Platform/Linker/Linux-GNUgold-C.cmake
@@ -2,3 +2,5 @@
 # file Copyright.txt or https://cmake.org/licensing for details.
 
 include(Platform/Linker/Linux-GNU-C)
+
+set(CMAKE_C_PLATFORM_LINKER_ID GNUgold)
diff --git a/Modules/Platform/Linker/Linux-GNUgold-CUDA.cmake b/Modules/Platform/Linker/Linux-GNUgold-CUDA.cmake
index d67dc94..0dc4ba2 100644
--- a/Modules/Platform/Linker/Linux-GNUgold-CUDA.cmake
+++ b/Modules/Platform/Linker/Linux-GNUgold-CUDA.cmake
@@ -2,3 +2,5 @@
 # file Copyright.txt or https://cmake.org/licensing for details.
 
 include(Platform/Linker/Linux-GNU-CUDA)
+
+set(CMAKE_CUDA_PLATFORM_LINKER_ID GNUgold)
diff --git a/Modules/Platform/Linker/Linux-GNUgold-CXX.cmake b/Modules/Platform/Linker/Linux-GNUgold-CXX.cmake
index 33c46d5..f390248 100644
--- a/Modules/Platform/Linker/Linux-GNUgold-CXX.cmake
+++ b/Modules/Platform/Linker/Linux-GNUgold-CXX.cmake
@@ -2,3 +2,5 @@
 # file Copyright.txt or https://cmake.org/licensing for details.
 
 include(Platform/Linker/Linux-GNU-CXX)
+
+set(CMAKE_CXX_PLATFORM_LINKER_ID GNUgold)
diff --git a/Modules/Platform/Linker/Linux-GNUgold-Fortran.cmake b/Modules/Platform/Linker/Linux-GNUgold-Fortran.cmake
index a01acda..531d524 100644
--- a/Modules/Platform/Linker/Linux-GNUgold-Fortran.cmake
+++ b/Modules/Platform/Linker/Linux-GNUgold-Fortran.cmake
@@ -2,3 +2,5 @@
 # file Copyright.txt or https://cmake.org/licensing for details.
 
 include(Platform/Linker/Linux-GNU-Fortran)
+
+set(CMAKE_Fortran_PLATFORM_LINKER_ID GNUgold)
diff --git a/Modules/Platform/Linker/Linux-GNUgold-HIP.cmake b/Modules/Platform/Linker/Linux-GNUgold-HIP.cmake
index 6d1e492..0b77210 100644
--- a/Modules/Platform/Linker/Linux-GNUgold-HIP.cmake
+++ b/Modules/Platform/Linker/Linux-GNUgold-HIP.cmake
@@ -2,3 +2,5 @@
 # file Copyright.txt or https://cmake.org/licensing for details.
 
 include(Platform/Linker/Linux-GNU-HIP)
+
+set(CMAKE_HIP_PLATFORM_LINKER_ID GNUgold)
diff --git a/Modules/Platform/Linker/Linux-LLD.cmake b/Modules/Platform/Linker/Linux-LLD.cmake
index afe5d1c..86eedd8 100644
--- a/Modules/Platform/Linker/Linux-LLD.cmake
+++ b/Modules/Platform/Linker/Linux-LLD.cmake
@@ -12,5 +12,6 @@ include(Platform/Linker/Linux-GNU)
 macro(__linux_linker_lld lang)
   __linux_linker_gnu(${lang})
 
+  set(CMAKE_${lang}_PLATFORM_LINKER_ID LLD)
   set(CMAKE_${lang}_LINK_LIBRARIES_PROCESSING ORDER=REVERSE DEDUPLICATION=ALL)
 endmacro()
diff --git a/Modules/Platform/Linker/Linux-MOLD.cmake b/Modules/Platform/Linker/Linux-MOLD.cmake
index 672e699..2a3d9dc 100644
--- a/Modules/Platform/Linker/Linux-MOLD.cmake
+++ b/Modules/Platform/Linker/Linux-MOLD.cmake
@@ -12,5 +12,7 @@ include(Platform/Linker/Linux-GNU)
 macro(__linux_linker_mold lang)
   __linux_linker_gnu(${lang})
 
+
+  set(CMAKE_C_PLATFORM_LINKER_ID MOLD)
   set(CMAKE_${lang}_LINK_LIBRARIES_PROCESSING ORDER=REVERSE DEDUPLICATION=ALL)
 endmacro()
diff --git a/Modules/Platform/Linker/NetBSD-GNU.cmake b/Modules/Platform/Linker/NetBSD-GNU.cmake
index f06e491..226afcd 100644
--- a/Modules/Platform/Linker/NetBSD-GNU.cmake
+++ b/Modules/Platform/Linker/NetBSD-GNU.cmake
@@ -8,6 +8,7 @@ include_guard()
 include(Platform/Linker/GNU)
 
 macro(__netbsd_linker_gnu lang)
+  set(CMAKE_${lang}_PLATFORM_LINKER_ID GNU)
   if(CMAKE_${lang}_COMPILER_LINKER)
     __cmake_set_whole_archive_feature("${CMAKE_${lang}_COMPILER_LINKER}" "${lang}")
   endif()
diff --git a/Modules/Platform/Linker/OpenBSD-GNU.cmake b/Modules/Platform/Linker/OpenBSD-GNU.cmake
index b30e467..c5821bb 100644
--- a/Modules/Platform/Linker/OpenBSD-GNU.cmake
+++ b/Modules/Platform/Linker/OpenBSD-GNU.cmake
@@ -8,6 +8,7 @@ include_guard()
 include(Platform/Linker/GNU)
 
 macro(__openbsd_linker_gnu lang)
+  set(CMAKE_${lang}_PLATFORM_LINKER_ID GNU)
   if(CMAKE_${lang}_COMPILER_LINKER)
     __cmake_set_whole_archive_feature("${CMAKE_${lang}_COMPILER_LINKER}" "${lang}")
   endif()
diff --git a/Modules/Platform/Linker/OpenBSD-LLD.cmake b/Modules/Platform/Linker/OpenBSD-LLD.cmake
index 522a232..05a1017 100644
--- a/Modules/Platform/Linker/OpenBSD-LLD.cmake
+++ b/Modules/Platform/Linker/OpenBSD-LLD.cmake
@@ -12,5 +12,6 @@ include(Platform/Linker/OpenBSD-GNU)
 macro(__openbsd_linker_lld lang)
   __openbsd_linker_gnu(${lang})
 
+  set(CMAKE_${lang}_PLATFORM_LINKER_ID LLD)
   set(CMAKE_${lang}_LINK_LIBRARIES_PROCESSING ORDER=REVERSE DEDUPLICATION=ALL)
 endmacro()
diff --git a/Modules/Platform/Linker/SerenityOS-GNU.cmake b/Modules/Platform/Linker/SerenityOS-GNU.cmake
index 9b06bfb..45f6505 100644
--- a/Modules/Platform/Linker/SerenityOS-GNU.cmake
+++ b/Modules/Platform/Linker/SerenityOS-GNU.cmake
@@ -8,6 +8,7 @@ include_guard()
 include(Platform/Linker/GNU)
 
 macro(__serenityos_linker_gnu lang)
+  set(CMAKE_${lang}_PLATFORM_LINKER_ID GNU)
   if(CMAKE_${lang}_COMPILER_LINKER)
     __cmake_set_whole_archive_feature("${CMAKE_${lang}_COMPILER_LINKER}" "${lang}")
   endif()
diff --git a/Modules/Platform/Linker/SerenityOS-LLD.cmake b/Modules/Platform/Linker/SerenityOS-LLD.cmake
index 9f34e79..f3c0389 100644
--- a/Modules/Platform/Linker/SerenityOS-LLD.cmake
+++ b/Modules/Platform/Linker/SerenityOS-LLD.cmake
@@ -12,5 +12,6 @@ include(Platform/Linker/SerenityOS-GNU)
 macro(__serenityos_linker_lld lang)
   __serenityos_linker_gnu(${lang})
 
+  set(CMAKE_${lang}_PLATFORM_LINKER_ID LLD)
   set(CMAKE_${lang}_LINK_LIBRARIES_PROCESSING ORDER=REVERSE DEDUPLICATION=ALL)
 endmacro()
diff --git a/Modules/Platform/Linker/SunOS-GNU.cmake b/Modules/Platform/Linker/SunOS-GNU.cmake
index 693e31a..ae9697d 100644
--- a/Modules/Platform/Linker/SunOS-GNU.cmake
+++ b/Modules/Platform/Linker/SunOS-GNU.cmake
@@ -8,6 +8,7 @@ include_guard()
 include(Platform/Linker/GNU)
 
 macro(__sunos_linker_gnu lang)
+  set(CMAKE_${lang}_PLATFORM_LINKER_ID GNU)
   if(CMAKE_${lang}_COMPILER_LINKER)
     __cmake_set_whole_archive_feature("${CMAKE_${lang}_COMPILER_LINKER}" "${lang}")
   endif()
diff --git a/Modules/Platform/Linker/SunOS-Solaris.cmake b/Modules/Platform/Linker/SunOS-Solaris.cmake
index cf82bf8..324108c 100644
--- a/Modules/Platform/Linker/SunOS-Solaris.cmake
+++ b/Modules/Platform/Linker/SunOS-Solaris.cmake
@@ -9,6 +9,7 @@ block(SCOPE_FOR POLICIES)
 cmake_policy(SET CMP0054 NEW)
 
 macro(__sunos_linker_solaris lang)
+  set(CMAKE_${lang}_PLATFORM_LINKER_ID Solaris)
   # Features for LINK_LIBRARY generator expression
   ## WHOLE_ARCHIVE: Force loading all members of an archive
   if (CMAKE_SYSTEM_VERSION VERSION_GREATER "5.10")
diff --git a/Modules/Platform/Linker/Windows-GNU.cmake b/Modules/Platform/Linker/Windows-GNU.cmake
index a5c4417..144b03e 100644
--- a/Modules/Platform/Linker/Windows-GNU.cmake
+++ b/Modules/Platform/Linker/Windows-GNU.cmake
@@ -8,6 +8,7 @@ include_guard()
 include(Platform/Linker/GNU)
 
 macro(__windows_linker_gnu lang)
+  set(CMAKE_${lang}_PLATFORM_LINKER_ID GNU)
   if(CMAKE_${lang}_COMPILER_LINKER)
     __cmake_set_whole_archive_feature("${CMAKE_${lang}_COMPILER_LINKER}" "${lang}")
   endif()
diff --git a/Modules/Platform/Linker/Windows-LLD.cmake b/Modules/Platform/Linker/Windows-LLD.cmake
index f2dde1a..5054745 100644
--- a/Modules/Platform/Linker/Windows-LLD.cmake
+++ b/Modules/Platform/Linker/Windows-LLD.cmake
@@ -9,6 +9,7 @@ block(SCOPE_FOR POLICIES)
 cmake_policy(SET CMP0054 NEW)
 
 macro(__windows_linker_lld lang)
+  set(CMAKE_${lang}_PLATFORM_LINKER_ID LLD)
   # Features for LINK_LIBRARY generator expression
   if(CMAKE_${lang}_COMPILER_LINKER_FRONTEND_VARIANT STREQUAL "GNU")
     include(Platform/Linker/Windows-GNU)
diff --git a/Modules/Platform/Linker/Windows-MSVC.cmake b/Modules/Platform/Linker/Windows-MSVC.cmake
index 2eb5713..18c2102 100644
--- a/Modules/Platform/Linker/Windows-MSVC.cmake
+++ b/Modules/Platform/Linker/Windows-MSVC.cmake
@@ -17,6 +17,7 @@ if(MSVC_VERSION GREATER "1900")
 endif()
 
 macro(__windows_linker_msvc lang)
+  set(CMAKE_${lang}_PLATFORM_LINKER_ID MSVC)
   set(CMAKE_${lang}_LINK_LIBRARIES_PROCESSING ORDER=FORWARD DEDUPLICATION=ALL)
 
   # Features for LINK_LIBRARY generator expression
diff --git a/Source/cmComputeLinkDepends.cxx b/Source/cmComputeLinkDepends.cxx
index 551a45b..d445128 100644
--- a/Source/cmComputeLinkDepends.cxx
+++ b/Source/cmComputeLinkDepends.cxx
@@ -449,6 +449,15 @@ public:
                        "_LINK_LIBRARIES_PROCESSING':\n", errorMessage),
               target->GetBacktrace());
           }
+          // For some environments, deduplication should be activated only if
+          // both policies CMP0156 and CMP0179 are NEW
+          if (makefile->GetDefinition(cmStrCat(
+                "CMAKE_", linkLanguage, "_PLATFORM_LINKER_ID")) == "LLD"_s &&
+              makefile->GetDefinition("CMAKE_EXECUTABLE_FORMAT") == "ELF"_s &&
+              target->GetPolicyStatusCMP0179() != cmPolicies::NEW &&
+              this->Deduplication == All) {
+            this->Deduplication = Shared;
+          }
         }
       }
     }
diff --git a/Tests/RunCMake/LinkLibrariesStrategy/Inspect.cmake b/Tests/RunCMake/LinkLibrariesStrategy/Inspect.cmake
index fd5da91..26f6388 100644
--- a/Tests/RunCMake/LinkLibrariesStrategy/Inspect.cmake
+++ b/Tests/RunCMake/LinkLibrariesStrategy/Inspect.cmake
@@ -3,6 +3,8 @@ enable_language(C)
 set(info "")
 foreach(var
     CMAKE_C_LINK_LIBRARIES_PROCESSING
+    CMAKE_C_PLATFORM_LINKER_ID
+    CMAKE_EXECUTABLE_FORMAT
     )
   if(DEFINED ${var})
     string(APPEND info "set(${var} \"${${var}}\")\n")
diff --git a/Tests/RunCMake/LinkLibrariesStrategy/RunCMakeTest.cmake b/Tests/RunCMake/LinkLibrariesStrategy/RunCMakeTest.cmake
index 787b636..7ae1006 100644
--- a/Tests/RunCMake/LinkLibrariesStrategy/RunCMakeTest.cmake
+++ b/Tests/RunCMake/LinkLibrariesStrategy/RunCMakeTest.cmake
@@ -10,13 +10,15 @@ endif()
 
 # Detect information from the toolchain:
 # - CMAKE_C_LINK_LIBRARIES_PROCESSING
+# - CMAKE_C_PLATFORM_LINKER_ID
+# - CMAKE_EXECUTABLE_FORMAT
 run_cmake(Inspect)
 include("${RunCMake_BINARY_DIR}/Inspect-build/info.cmake")
 
 run_cmake(Unknown)
 
 function(run_strategy case exe)
-  foreach(cmp0179 OLD NEW)
+  foreach(cmp0179 ${cmp0179_states})
     set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/${case}-CMP0179-${cmp0179}-build)
     set(RunCMake_TEST_VARIANT_DESCRIPTION "...CMP0179-${cmp0179}")
     if("DEDUPLICATION=ALL" IN_LIST CMAKE_C_LINK_LIBRARIES_PROCESSING)
@@ -44,6 +46,13 @@ function(run_strategy case exe)
   endforeach()
 endfunction()
 
+if(CMAKE_C_PLATFORM_LINKER_ID STREQUAL "LLD" AND CMAKE_EXECUTABLE_FORMAT STREQUAL "ELF")
+  # deduplication done only if both CMP0156 and CMP0179 ARE NEW
+  set(cmp0179_states NEW)
+else()
+  set(cmp0179_states OLD NEW)
+endif()
+
 run_strategy(Basic-REORDER_MINIMALLY "main")
 run_strategy(Basic-REORDER_FREELY "main")