LinkerId: Suppress decorated diagnostics during linker inspection

Fixes: #26747

Modules/CMakeDetermineCompilerABI.cmake

@@ -67,6 +67,8 @@ function(CMAKE_DETERMINE_COMPILER_ABI lang src)
       # executables.  This may lead to issues when their stderr output (which
       # contains the relevant compiler internals) becomes interweaved.
       string(REGEX REPLACE "(^| )-pipe( |$)" " " ${v} "${${v}}")
+      # Suppress any formatting of warnings and/or errors
+      string(REGEX REPLACE "(-f|/)diagnostics(-|:)color(=[a-z]+)?" "" ${v} "${${v}}")
     endforeach()
 
     # Save the current LC_ALL, LC_MESSAGES, and LANG environment variables

Tests/RunCMake/ParseImplicitLinkInfo/CheckCompilerLinkerId.cmake

@@ -0,0 +1,5 @@
+enable_language(C)
+
+if(NOT CMAKE_C_COMPILER_LINKER OR NOT CMAKE_C_COMPILER_LINKER_ID)
+  message(FATAL_ERROR "Failed to determine Linker.")
+endif()

Tests/RunCMake/ParseImplicitLinkInfo/RunCMakeTest.cmake

@@ -39,3 +39,7 @@ if(CMAKE_SYSTEM_NAME MATCHES "^(Linux|Darwin|Windows|AIX|SunOS)$|BSD"
       )
   endif()
 endif()
+
+if(CMAKE_C_COMPILER_ID STREQUAL "GNU" OR CMAKE_C_COMPILER_ID MATCHES Clang)
+  run_cmake_with_options(CheckCompilerLinkerId "-DCMAKE_C_FLAGS=-fdiagnostics-color=always")
+endif()