Add CMAKE_HOST_EXECUTABLE_SUFFIX for Unix/Windows

Closes: #17553

Help/manual/cmake-variables.7.rst

@@ -323,6 +323,7 @@ Variables that Describe the System
    /variable/CMAKE_COMPILER_2005
    /variable/CMAKE_HOST_APPLE
    /variable/CMAKE_HOST_BSD
+   /variable/CMAKE_HOST_EXECUTABLE_SUFFIX
    /variable/CMAKE_HOST_LINUX
    /variable/CMAKE_HOST_SOLARIS
    /variable/CMAKE_HOST_SYSTEM

Help/release/dev/cmake_host_executable_suffix.rst

@@ -0,0 +1,5 @@
+cmake-host-executable-suffix
+----------------------------
+
+* The :variable:`CMAKE_HOST_EXECUTABLE_SUFFIX` variable was added to
+  provide suffix for executable names on the host platform.

Help/variable/CMAKE_EXECUTABLE_SUFFIX.rst

@@ -1,10 +1,14 @@
 CMAKE_EXECUTABLE_SUFFIX
 -----------------------
 
-The suffix for executables on this platform.
+The suffix for executables on the target platform.
 
 The suffix to use for the end of an executable filename if any, ``.exe``
 on Windows.
 
 :variable:`CMAKE_EXECUTABLE_SUFFIX_<LANG>` overrides this for
 language ``<LANG>``.
+
+
+See the :variable:`CMAKE_HOST_EXECUTABLE_SUFFIX` variable for the
+executable suffix on the host platform.

Help/variable/CMAKE_HOST_EXECUTABLE_SUFFIX.rst

@@ -0,0 +1,12 @@
+CMAKE_HOST_EXECUTABLE_SUFFIX
+----------------------------
+
+.. versionadded:: 3.31
+
+The suffix for executables on the host platform.  This may differ from
+the suffix for the target platform, :variable:`CMAKE_EXECUTABLE_SUFFIX`.
+
+The suffix to use for the end of an executable filename if any, ``.exe``
+on Windows.
+
+See also :variable:`CMAKE_EXECUTABLE_SUFFIX`.

Source/cmStateSnapshot.cxx

@@ -298,9 +298,11 @@ void cmStateSnapshot::SetDefaultDefinitions()
   if (hostSystemName == "Windows") {
     this->SetDefinition("WIN32", "1");
     this->SetDefinition("CMAKE_HOST_WIN32", "1");
+    this->SetDefinition("CMAKE_HOST_EXECUTABLE_SUFFIX", ".exe");
   } else {
     this->SetDefinition("UNIX", "1");
     this->SetDefinition("CMAKE_HOST_UNIX", "1");
+    this->SetDefinition("CMAKE_HOST_EXECUTABLE_SUFFIX", "");
   }
 #if defined(__APPLE__)
   this->SetDefinition("APPLE", "1");