Merge topic 'fix-dependent-pipelines' into release-3.18

726766713b gitlab-ci: avoid failing dependent steps

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !5069
diff --git a/Modules/ExternalProject.cmake b/Modules/ExternalProject.cmake
index 3a47090..aecc00b 100644
--- a/Modules/ExternalProject.cmake
+++ b/Modules/ExternalProject.cmake
@@ -1124,7 +1124,11 @@
     message(FATAL_ERROR "Tag for git checkout should not be empty.")
   endif()
 
-  set(git_clone_options "--no-checkout")
+  if(GIT_VERSION_STRING VERSION_LESS 2.20 OR 2.21 VERSION_LESS_EQUAL GIT_VERSION_STRING)
+    set(git_clone_options "--no-checkout")
+  else()
+    set(git_clone_options)
+  endif()
   if(git_shallow)
     if(NOT GIT_VERSION_STRING VERSION_LESS 1.7.10)
       list(APPEND git_clone_options "--depth 1 --no-single-branch")
diff --git a/Modules/FindXalanC.cmake b/Modules/FindXalanC.cmake
index 3adaa44..54783e3 100644
--- a/Modules/FindXalanC.cmake
+++ b/Modules/FindXalanC.cmake
@@ -47,9 +47,9 @@
 function(_XalanC_GET_VERSION  version_hdr)
     file(STRINGS ${version_hdr} _contents REGEX "^[ \t]*#define XALAN_VERSION_.*")
     if(_contents)
-        string(REGEX REPLACE "[^*]*#define XALAN_VERSION_MAJOR[ \t]+([0-9]+).*" "\\1" XalanC_MAJOR "${_contents}")
-        string(REGEX REPLACE "[^*]*#define XALAN_VERSION_MINOR[ \t]+([0-9]+).*" "\\1" XalanC_MINOR "${_contents}")
-        string(REGEX REPLACE "[^*]*#define XALAN_VERSION_REVISION[ \t]+([0-9]+).*" "\\1" XalanC_PATCH "${_contents}")
+        string(REGEX REPLACE "[^*]*#define XALAN_VERSION_MAJOR[ \t(]+([0-9]+).*" "\\1" XalanC_MAJOR "${_contents}")
+        string(REGEX REPLACE "[^*]*#define XALAN_VERSION_MINOR[ \t(]+([0-9]+).*" "\\1" XalanC_MINOR "${_contents}")
+        string(REGEX REPLACE "[^*]*#define XALAN_VERSION_REVISION[ \t(]+([0-9]+).*" "\\1" XalanC_PATCH "${_contents}")
 
         if(NOT XalanC_MAJOR MATCHES "^[0-9]+$")
             message(FATAL_ERROR "Version parsing failed for XALAN_VERSION_MAJOR!")
diff --git a/Source/cmGlobalXCodeGenerator.cxx b/Source/cmGlobalXCodeGenerator.cxx
index 65828ce..f0737e8 100644
--- a/Source/cmGlobalXCodeGenerator.cxx
+++ b/Source/cmGlobalXCodeGenerator.cxx
@@ -3483,6 +3483,8 @@
   if (this->XcodeVersion >= 100) {
     xout.Element("key", "BuildSystemType");
     xout.Element("string", "Original");
+    xout.Element("key", "DisableBuildSystemDeprecationWarning");
+    xout.Element("true");
   }
   if (hasGeneratedSchemes) {
     xout.Element("key",
diff --git a/Source/cmVisualStudio10TargetGenerator.cxx b/Source/cmVisualStudio10TargetGenerator.cxx
index a3ccd2b..a8e424d 100644
--- a/Source/cmVisualStudio10TargetGenerator.cxx
+++ b/Source/cmVisualStudio10TargetGenerator.cxx
@@ -2884,6 +2884,12 @@
     clOptions.RemoveFlag("SpectreMitigation");
   }
 
+  // Remove any target-wide -TC or -TP flag added by the project.
+  // Such flags are unnecessary and break our model of language selection.
+  if (langForClCompile == "C" || langForClCompile == "CXX") {
+    clOptions.RemoveFlag("CompileAs");
+  }
+
   this->ClOptions[configName] = std::move(pOptions);
   return true;
 }
diff --git a/Tests/SetLang/CMakeLists.txt b/Tests/SetLang/CMakeLists.txt
index f24e5cb..9de4fc6 100644
--- a/Tests/SetLang/CMakeLists.txt
+++ b/Tests/SetLang/CMakeLists.txt
@@ -8,3 +8,10 @@
 set_source_files_properties(foo.c bar.c PROPERTIES LANGUAGE CXX)
 target_link_libraries(SetLang foo)
 set_target_properties(SetLang PROPERTIES LINKER_LANGUAGE CXX)
+
+# VS generators historically tolerated target-wide -TP flags added
+# by project code, so cover that case to preserve the behavior.
+if(CMAKE_GENERATOR MATCHES "^Visual Studio" AND "x${CMAKE_C_COMPILER_ID}" STREQUAL "xMSVC")
+  add_library(stay stay_c.c stay_cxx.cxx)
+  set_property(TARGET stay PROPERTY COMPILE_OPTIONS "-TP")
+endif()
diff --git a/Tests/SetLang/stay_c.c b/Tests/SetLang/stay_c.c
new file mode 100644
index 0000000..70755f3
--- /dev/null
+++ b/Tests/SetLang/stay_c.c
@@ -0,0 +1,8 @@
+#ifdef __cplusplus
+#  error C source incorrectly compiled as C++
+#endif
+
+int stay_c(void)
+{
+  return 0;
+}
diff --git a/Tests/SetLang/stay_cxx.cxx b/Tests/SetLang/stay_cxx.cxx
new file mode 100644
index 0000000..e035260
--- /dev/null
+++ b/Tests/SetLang/stay_cxx.cxx
@@ -0,0 +1,8 @@
+#ifndef __cplusplus
+#  error C++ source incorrectly compiled as C
+#endif
+
+int stay_cxx()
+{
+  return 0;
+}
diff --git a/bootstrap b/bootstrap
index 18ab073..04067dc 100755
--- a/bootstrap
+++ b/bootstrap
@@ -1181,7 +1181,7 @@
 }
 #endif
 
-#if (__cplusplus >= 201703L || defined(__INTEL_COMPILER) && defined(__cpp_if_constexpr))
+#if (__cplusplus >= 201703L || defined(__INTEL_COMPILER) && defined(__cpp_deduction_guides))
 #include <optional>
 template <typename T,
           typename std::invoke_result<decltype(&T::get), T>::type = nullptr>