From ccef69bde4f3e307f7f518101f2122858239e0d8 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Wed, 23 Apr 2025 11:25:01 -0400
Subject: AUTOMOC: Avoid compiler warnings while computing predefines

LLVM/Clang 20, when invoked as `clang++ -E -c ...`, now warns:

    warning: argument unused during compilation: '-c'

Drop the unnecessary `-c` flag.  Also add a `-w` flag to suppress
warnings so their text is not parsed as predefines.
---
 Modules/Compiler/GNU.cmake       | 2 +-
 Modules/Compiler/IBMClang.cmake  | 2 +-
 Modules/Compiler/Intel.cmake     | 2 +-
 Modules/Compiler/IntelLLVM.cmake | 2 +-
 Modules/Compiler/LCC.cmake       | 2 +-
 5 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/Modules/Compiler/GNU.cmake b/Modules/Compiler/GNU.cmake
index 83c818d..793261e 100644
--- a/Modules/Compiler/GNU.cmake
+++ b/Modules/Compiler/GNU.cmake
@@ -133,7 +133,7 @@ macro(__compiler_gnu lang)
       list(APPEND CMAKE_${lang}_COMPILER_PREDEFINES_COMMAND ${_COMPILER_ARGS})
       unset(_COMPILER_ARGS)
     endif()
-    list(APPEND CMAKE_${lang}_COMPILER_PREDEFINES_COMMAND "-dM" "-E" "-c" "${CMAKE_ROOT}/Modules/CMakeCXXCompilerABI.cpp")
+    list(APPEND CMAKE_${lang}_COMPILER_PREDEFINES_COMMAND "-w" "-dM" "-E" "${CMAKE_ROOT}/Modules/CMakeCXXCompilerABI.cpp")
   endif()
 
   if(NOT "x${lang}" STREQUAL "xFortran")
diff --git a/Modules/Compiler/IBMClang.cmake b/Modules/Compiler/IBMClang.cmake
index a43f788..58645aa 100644
--- a/Modules/Compiler/IBMClang.cmake
+++ b/Modules/Compiler/IBMClang.cmake
@@ -70,7 +70,7 @@ macro(__compiler_ibmclang lang)
   )
 
   if("${lang}" STREQUAL "CXX")
-    list(APPEND CMAKE_${lang}_COMPILER_PREDEFINES_COMMAND "-dM" "-E" "-c" "${CMAKE_ROOT}/Modules/CMakeCXXCompilerABI.cpp")
+    list(APPEND CMAKE_${lang}_COMPILER_PREDEFINES_COMMAND "-w" "-dM" "-E" "${CMAKE_ROOT}/Modules/CMakeCXXCompilerABI.cpp")
   endif()
 
   set(CMAKE_PCH_EXTENSION .pch)
diff --git a/Modules/Compiler/Intel.cmake b/Modules/Compiler/Intel.cmake
index 367d26e..bc6f50f 100644
--- a/Modules/Compiler/Intel.cmake
+++ b/Modules/Compiler/Intel.cmake
@@ -40,7 +40,7 @@ else()
         list(APPEND CMAKE_${lang}_COMPILER_PREDEFINES_COMMAND ${_COMPILER_ARGS})
         unset(_COMPILER_ARGS)
       endif()
-      list(APPEND CMAKE_${lang}_COMPILER_PREDEFINES_COMMAND "-QdM" "-P" "-Za" "${CMAKE_ROOT}/Modules/CMakeCXXCompilerABI.cpp")
+      list(APPEND CMAKE_${lang}_COMPILER_PREDEFINES_COMMAND "-w" "-QdM" "-P" "-Za" "${CMAKE_ROOT}/Modules/CMakeCXXCompilerABI.cpp")
     endif()
 
     if("x${lang}" STREQUAL "xFortran")
diff --git a/Modules/Compiler/IntelLLVM.cmake b/Modules/Compiler/IntelLLVM.cmake
index b9f4ca0..d3d1bc3 100644
--- a/Modules/Compiler/IntelLLVM.cmake
+++ b/Modules/Compiler/IntelLLVM.cmake
@@ -100,7 +100,7 @@ else()
         list(APPEND CMAKE_${lang}_COMPILER_PREDEFINES_COMMAND ${_COMPILER_ARGS})
         unset(_COMPILER_ARGS)
       endif()
-      list(APPEND CMAKE_${lang}_COMPILER_PREDEFINES_COMMAND "-dM" "-E" "-c" "${CMAKE_ROOT}/Modules/CMakeCXXCompilerABI.cpp")
+      list(APPEND CMAKE_${lang}_COMPILER_PREDEFINES_COMMAND "-w" "-dM" "-E" "${CMAKE_ROOT}/Modules/CMakeCXXCompilerABI.cpp")
       if(CMAKE_${lang}_COMPILER_TARGET)
         list(APPEND CMAKE_${lang}_COMPILER_PREDEFINES_COMMAND "--target=${CMAKE_${lang}_COMPILER_TARGET}")
       endif()
diff --git a/Modules/Compiler/LCC.cmake b/Modules/Compiler/LCC.cmake
index 2892ec6..9cf957d 100644
--- a/Modules/Compiler/LCC.cmake
+++ b/Modules/Compiler/LCC.cmake
@@ -83,7 +83,7 @@ macro(__compiler_lcc lang)
       list(APPEND CMAKE_${lang}_COMPILER_PREDEFINES_COMMAND ${_COMPILER_ARGS})
       unset(_COMPILER_ARGS)
     endif()
-    list(APPEND CMAKE_${lang}_COMPILER_PREDEFINES_COMMAND "-dM" "-E" "-c" "${CMAKE_ROOT}/Modules/CMakeCXXCompilerABI.cpp")
+    list(APPEND CMAKE_${lang}_COMPILER_PREDEFINES_COMMAND "-w" "-dM" "-E" "${CMAKE_ROOT}/Modules/CMakeCXXCompilerABI.cpp")
   endif()
 
   if(NOT "x${lang}" STREQUAL "xFortran")
-- 
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