tests: Preserve empty arguments in test command lines

This will now preserve empty values in the TEST_LAUNCHER and
CROSSCOMPILING_EMULATOR target properties for tests added by:

- The add_test() command.
- The ExternalData_Add_Test() command from the ExternalData module.
- The gtest_add_tests() or gtest_discover_tests() commands from the
  GoogleTest module.

For the gtest_add_tests() and gtest_discover_tests() commands,
empty elements in the values passed after the EXTRA_ARGS keyword
are also now preserved.

Policy CMP0178 is added to provide backward compatibility with the
old behavior where empty values were silently discarded from the
above cases.

Fixes: #26337

1 files changed, 12 insertions, 1 deletions

diff --git a/Source/cmTest.h b/Source/cmTest.h
index 480966a..244aa62 100644
--- a/Source/cmTest.h
+++ b/Source/cmTest.h
@@ -61,12 +61,22 @@ public:
   bool GetOldStyle() const { return this->OldStyle; }
   void SetOldStyle(bool b) { this->OldStyle = b; }
 
-  /** Get/Set if CMP0158 policy is NEW */
+  /** Get if CMP0158 policy is NEW */
   bool GetCMP0158IsNew() const
   {
     return this->PolicyStatusCMP0158 == cmPolicies::NEW;
   }
 
+  /** Get/Set the CMP0178 policy setting */
+  cmPolicies::PolicyStatus GetCMP0178() const
+  {
+    return this->PolicyStatusCMP0178;
+  }
+  void SetCMP0178(cmPolicies::PolicyStatus p)
+  {
+    this->PolicyStatusCMP0178 = p;
+  }
+
   /** Set/Get whether lists in command lines should be expanded. */
   bool GetCommandExpandLists() const;
   void SetCommandExpandLists(bool b);
@@ -82,4 +92,5 @@ private:
   cmMakefile* Makefile;
   cmListFileBacktrace Backtrace;
   cmPolicies::PolicyStatus PolicyStatusCMP0158;
+  cmPolicies::PolicyStatus PolicyStatusCMP0178;
 };