Merge branch 'while-bug-compatibility' into release-3.22

Merge-request: !7041

Source/cmWhileCommand.cxx

@@ -79,12 +79,17 @@ bool cmWhileFunctionBlocker::Replay(std::vector<cmListFileFunction> functions,
     return out;
   };
 
+  // FIXME(#23296): For compatibility with older versions of CMake, we
+  // tolerate condition errors that evaluate to false.  We should add
+  // a policy to enforce such errors.
+  bool enforceError = true;
   std::string errorString;
   MessageType messageType;
 
   for (cmConditionEvaluator conditionEvaluator(mf, whileBT);
-       conditionEvaluator.IsTrue(expandArgs(this->Args, expandedArguments),
-                                 errorString, messageType);) {
+       (enforceError = /* enforce condition errors that evaluate to true */
+        conditionEvaluator.IsTrue(expandArgs(this->Args, expandedArguments),
+                                  errorString, messageType));) {
     // Invoke all the functions that were collected in the block.
     for (cmListFileFunction const& fn : functions) {
       cmExecutionStatus status(mf);
@@ -105,7 +110,7 @@ bool cmWhileFunctionBlocker::Replay(std::vector<cmListFileFunction> functions,
     }
   }
 
-  if (!errorString.empty()) {
+  if (!errorString.empty() && enforceError) {
     std::string err = "had incorrect arguments:\n ";
     for (auto const& i : expandedArguments) {
       err += " ";

Tests/RunCMake/if/unbalanced-parenthesis-stderr.txt

@@ -1,7 +1,7 @@
 CMake Error at unbalanced-parenthesis\.cmake:[0-9]+ \(if\):
   if given arguments:
 
-    "NOT" "\(" "IN_LIST" "some_list"
+    "\("
 
   mismatched parenthesis in condition
 Call Stack \(most recent call first\):

Tests/RunCMake/if/unbalanced-parenthesis.cmake

@@ -1,8 +1,5 @@
-set(var_with_paren "(")
-set(some_list "")
-
-if(NOT ${var_with_paren} IN_LIST some_list)
-  message(STATUS "Never prints")
-else()
-  message(STATUS "Never prints")
+set(paren "(")
+if(${paren})
+  message(STATUS "Condition incorrectly true")
 endif()
+message(STATUS "Code incorrectly accepted")

Tests/RunCMake/while/unbalanced-parenthesis-result.txt

@@ -1 +0,0 @@
-1

Tests/RunCMake/while/unbalanced-parenthesis-stderr.txt

@@ -1,8 +0,0 @@
-CMake Error at unbalanced-parenthesis.cmake:[0-9]+ \(while\):
-  had incorrect arguments:
-
-    "NOT" "\(" "IN_LIST" "some_list"
-
-  mismatched parenthesis in condition
-Call Stack \(most recent call first\):
-  CMakeLists\.txt:[0-9]+ \(include\)

Tests/RunCMake/while/unbalanced-parenthesis-stdout.txt

@@ -0,0 +1 @@
+-- Code incorrectly accepted

Tests/RunCMake/while/unbalanced-parenthesis.cmake

@@ -1,8 +1,7 @@
-set(var_with_paren "(")
-set(some_list "")
-
-while(NOT ${var_with_paren} IN_LIST some_list)
-  message(STATUS "Never prints")
+set(paren "(")
+while(${paren})
+  message(STATUS "Condition incorrectly true")
+  break()
 endwhile()
-
-message(STATUS "Never prints")
+# FIXME(#23296): The above condition error is tolerated for compatibility.
+message(STATUS "Code incorrectly accepted")