From b186329d3db0083d77e61ded709f4e70a596631d Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Mon, 18 Feb 2019 11:43:37 -0500
Subject: Use -? instead of /? to test compiler for MSVC-like command-line
 support

MS-style command-line tools accept either `/` or `-` for command-line
options.  Prefer `-` over `/` so that non-MS tools do not treat it as a
path.

Fixes: #18941
---
 Modules/CMakeDetermineASMCompiler.cmake   | 2 +-
 Modules/CMakeDetermineCompilerId.cmake    | 2 +-
 Modules/CMakeDetermineVSServicePack.cmake | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/Modules/CMakeDetermineASMCompiler.cmake b/Modules/CMakeDetermineASMCompiler.cmake
index dbc41c8..ac27f87 100644
--- a/Modules/CMakeDetermineASMCompiler.cmake
+++ b/Modules/CMakeDetermineASMCompiler.cmake
@@ -83,7 +83,7 @@ if(NOT CMAKE_ASM${ASM_DIALECT}_COMPILER_ID)
   set(CMAKE_ASM${ASM_DIALECT}_COMPILER_ID_VENDOR_REGEX_XL "XL C")
 
   list(APPEND CMAKE_ASM${ASM_DIALECT}_COMPILER_ID_VENDORS MSVC )
-  set(CMAKE_ASM${ASM_DIALECT}_COMPILER_ID_VENDOR_FLAGS_MSVC "/?")
+  set(CMAKE_ASM${ASM_DIALECT}_COMPILER_ID_VENDOR_FLAGS_MSVC "-?")
   set(CMAKE_ASM${ASM_DIALECT}_COMPILER_ID_VENDOR_REGEX_MSVC "Microsoft")
 
   list(APPEND CMAKE_ASM${ASM_DIALECT}_COMPILER_ID_VENDORS TI )
diff --git a/Modules/CMakeDetermineCompilerId.cmake b/Modules/CMakeDetermineCompilerId.cmake
index 83ce392..8ba4246 100644
--- a/Modules/CMakeDetermineCompilerId.cmake
+++ b/Modules/CMakeDetermineCompilerId.cmake
@@ -824,7 +824,7 @@ function(CMAKE_DIAGNOSE_UNSUPPORTED_CLANG lang envvar)
   endif()
 
   # Test whether an MSVC-like command-line option works.
-  execute_process(COMMAND "${CMAKE_${lang}_COMPILER}" /?
+  execute_process(COMMAND "${CMAKE_${lang}_COMPILER}" -?
     RESULT_VARIABLE _clang_result
     OUTPUT_VARIABLE _clang_stdout
     ERROR_VARIABLE _clang_stderr)
diff --git a/Modules/CMakeDetermineVSServicePack.cmake b/Modules/CMakeDetermineVSServicePack.cmake
index 9edc309..a3c4d9c 100644
--- a/Modules/CMakeDetermineVSServicePack.cmake
+++ b/Modules/CMakeDetermineVSServicePack.cmake
@@ -79,7 +79,7 @@ endfunction()
 function(_DetermineVSServicePack_FastCheckVersionWithCompiler _SUCCESS_VAR  _VERSION_VAR)
     if(EXISTS ${CMAKE_CXX_COMPILER})
       execute_process(
-          COMMAND ${CMAKE_CXX_COMPILER} /?
+          COMMAND ${CMAKE_CXX_COMPILER} -?
           ERROR_VARIABLE _output
           OUTPUT_QUIET
         )
-- 
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