cmMakefile: Restore nested error logic use of cmExecutionStatus

Since commit 14a8d61f (cmMakefile: Port nested error logic away from
cmExecutionStatus) we fail to continue processing function and macro
bodies after non-fatal errors.  A non-fatal error should not stop
foreach loops, macro bodies, nested bodies, or the outer script.
Add a test covering these cases, and revert the change to fix them.

Also revert commit 2af853de (cmMakefile: Simplify IssueMessage
implementation) because the assertion it added (which was removed by the
above commit and is restored by reverting it) is incorrect.  We do have
code paths that call cmMakefile::IssueMessage with an empty execution
stack, such as in CheckForUnusedVariables's LogUnused call.

4 files changed, 17 insertions, 16 deletions

diff --git a/Source/cmExecutionStatus.h b/Source/cmExecutionStatus.h
index 14e1454..7302837 100644
--- a/Source/cmExecutionStatus.h
+++ b/Source/cmExecutionStatus.h
@@ -40,12 +40,16 @@ public:
     this->ReturnInvoked = false;
     this->BreakInvoked = false;
     this->ContinueInvoked = false;
+    this->NestedError = false;
   }
+  void SetNestedError(bool val) { this->NestedError = val; }
+  bool GetNestedError() { return this->NestedError; }
 
 private:
   bool ReturnInvoked;
   bool BreakInvoked;
   bool ContinueInvoked;
+  bool NestedError;
 };
 
 #endif
diff --git a/Source/cmFunctionCommand.cxx b/Source/cmFunctionCommand.cxx
index f0e4854..40c54db 100644
--- a/Source/cmFunctionCommand.cxx
+++ b/Source/cmFunctionCommand.cxx
@@ -76,7 +76,7 @@ public:
 };
 
 bool cmFunctionHelperCommand::InvokeInitialPass(
-  const std::vector<cmListFileArgument>& args, cmExecutionStatus&)
+  const std::vector<cmListFileArgument>& args, cmExecutionStatus& inStatus)
 {
   // Expand the argument list to the function.
   std::vector<std::string> expandedArgs;
@@ -129,11 +129,11 @@ bool cmFunctionHelperCommand::InvokeInitialPass(
   for (unsigned int c = 0; c < this->Functions.size(); ++c) {
     cmExecutionStatus status;
     if (!this->Makefile->ExecuteCommand(this->Functions[c], status) ||
-        (cmSystemTools::GetErrorOccuredFlag() &&
-         !cmSystemTools::GetFatalErrorOccured())) {
+        status.GetNestedError()) {
       // The error message should have already included the call stack
       // so we do not need to report an error here.
       functionScope.Quiet();
+      inStatus.SetNestedError(true);
       return false;
     }
     if (status.GetReturnInvoked()) {
diff --git a/Source/cmMacroCommand.cxx b/Source/cmMacroCommand.cxx
index 9d312ee..ee9dc8a 100644
--- a/Source/cmMacroCommand.cxx
+++ b/Source/cmMacroCommand.cxx
@@ -159,11 +159,11 @@ bool cmMacroHelperCommand::InvokeInitialPass(
     }
     cmExecutionStatus status;
     if (!this->Makefile->ExecuteCommand(newLFF, status) ||
-        (cmSystemTools::GetErrorOccuredFlag() &&
-         !cmSystemTools::GetFatalErrorOccured())) {
+        status.GetNestedError()) {
       // The error message should have already included the call stack
       // so we do not need to report an error here.
       macroScope.Quiet();
+      inStatus.SetNestedError(true);
       return false;
     }
     if (status.GetReturnInvoked()) {
diff --git a/Source/cmMakefile.cxx b/Source/cmMakefile.cxx
index 11ccca1..e5a5e6e 100644
--- a/Source/cmMakefile.cxx
+++ b/Source/cmMakefile.cxx
@@ -117,6 +117,11 @@ cmMakefile::~cmMakefile()
 void cmMakefile::IssueMessage(cmake::MessageType t,
                               std::string const& text) const
 {
+  if (!this->ExecutionStatusStack.empty()) {
+    if ((t == cmake::FATAL_ERROR) || (t == cmake::INTERNAL_ERROR)) {
+      this->ExecutionStatusStack.back()->SetNestedError(true);
+    }
+  }
   this->GetCMakeInstance()->IssueMessage(t, text, this->GetBacktrace());
 }
 
@@ -277,19 +282,11 @@ bool cmMakefile::ExecuteCommand(const cmListFileFunction& lff,
       if (this->GetCMakeInstance()->GetTrace()) {
         this->PrintCommandTrace(lff);
       }
-
-      bool hadPreviousNonFatalError = cmSystemTools::GetErrorOccuredFlag() &&
-        !cmSystemTools::GetFatalErrorOccured();
-      cmSystemTools::ResetErrorOccuredFlag();
-
+      // Try invoking the command.
       bool invokeSucceeded = pcmd->InvokeInitialPass(lff.Arguments, status);
-      bool hadNestedError = cmSystemTools::GetErrorOccuredFlag() &&
-        !cmSystemTools::GetFatalErrorOccured();
-      if (hadPreviousNonFatalError) {
-        cmSystemTools::SetErrorOccured();
-      }
+      bool hadNestedError = status.GetNestedError();
       if (!invokeSucceeded || hadNestedError) {
-        if (!hadNestedError && !cmSystemTools::GetFatalErrorOccured()) {
+        if (!hadNestedError) {
           // The command invocation requested that we report an error.
           this->IssueMessage(cmake::FATAL_ERROR, pcmd->GetError());
         }