Macro-variables defined without a value are now set to “true”

They were previously set to 1.

Ref. preprocessor#43

doc/manual/source/running-dynare.rst

@@ -365,14 +365,15 @@ by the ``dynare`` command.
         instead of ``psexec``, to properly allocate affinity when there are
         more than 32 cores in the local machine. [default=true]
 
-    .. option:: -DMACRO_VARIABLE=MACRO_EXPRESSION
+    .. option:: -DMACRO_VARIABLE[=MACRO_EXPRESSION]
 
         Defines a macro-variable from the command line (the same effect as
         using the Macro directive ``@#define`` in a model file, see
         :ref:`macro-proc-lang`). See the :ref:`note on quotes<quote-note>` for
         info on passing a ``MACRO_EXPRESSION`` argument containing spaces. Note
         that an expression passed on the command line can reference variables
-        defined before it.
+        defined before it. If ``MACRO_EXPRESSION`` is omitted, the variable is
+        assigned the ``true`` logical value.
 
         *Example*
 
@@ -380,7 +381,7 @@ by the ``dynare`` command.
 
             .. code-block:: matlab
 
-               >> dynare <<modfile.mod>> -DA=true '-DB="A string with space"' -DC=[1,2,3] '-DD=[ i in C when i > 1 ]'
+               >> dynare <<modfile.mod>> -DA=true '-DB="A string with space"' -DC=[1,2,3] '-DD=[ i in C when i > 1 ]' -DE
 
     .. option:: -I<<path>>
 

doc/manual/source/the-model-file.rst

@@ -14278,7 +14278,7 @@ Macro directives
 
         ::
 
-            @#define var                      // Equals 1
+            @#define var                      // Equals true
             @#define x = 5                    // Real
             @#define y = "US"                 // String
             @#define v = [ 1, 2, 4 ]          // Real array

preprocessor

@@ -1 +1 @@
-Subproject commit 2a68f5a3af2886ce40149b1af10a9c08d5b4099c
+Subproject commit 41b1e897569763c6688894597b7cab0cbb14a83d

tests/macro_processor/example1_macro.mod

@@ -103,7 +103,12 @@ e = 0;
 u = 0;
 end;
 
-@#define DEFINEDvar=0
+@#define DEFINEDvar
+
+// See preprocessor#43
+@#if !(DEFINEDvar == true)
+@#error "A variable defined without a value should be equal to logical true"
+@#endif
 
 @#ifndef DEFINEDvar
 @#error "IFNDEF PROBLEM"