From ba5f8dbba365ff29898a0809e2e7950ffe4e164c Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Wed, 13 Dec 2023 10:42:14 -0500
Subject: LinkerId: Use empty string for unknown linker id

Since commit c26c6ac488 (Link Step: compute effective linker used by the
compiler, 2023-05-27) we used `UNKNOWN` if the linker id is not known.
This convention is not used elsewhere, and logic using the linker id
is easier when `if(CMAKE_C_COMPILER_LINKER_ID)` is false on unknown id.
---
 Modules/Internal/CMakeDetermineLinkerId.cmake | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/Modules/Internal/CMakeDetermineLinkerId.cmake b/Modules/Internal/CMakeDetermineLinkerId.cmake
index 7f0b516..e0a57eb 100644
--- a/Modules/Internal/CMakeDetermineLinkerId.cmake
+++ b/Modules/Internal/CMakeDetermineLinkerId.cmake
@@ -83,10 +83,6 @@ function(cmake_determine_linker_id lang linker)
       break()
     endif()
   endforeach()
-  if(NOT linker_id)
-    # unknown linker
-    set(linker_id "UNKNOWN")
-  endif()
 
   set(CMAKE_${lang}_COMPILER_LINKER_ID "${linker_id}" PARENT_SCOPE)
   if (linker_frontend)
-- 
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