eolian gen: generate documentation for first object param if present

This prevents doxygen from emitting warnings.

Fixes T6186.

src/bin/eolian/docs.c

@@ -569,6 +569,17 @@ eo_gen_docs_func_gen(const Eolian_Unit *src, const Eolian_Function *fid,
           }
      }
 
+   if (!eolian_function_is_class(fid))
+     {
+        _indent_line(buf, indent);
+        eina_strbuf_append(buf, " * @param[in] obj The object.\n");
+        if (!par && (rdoc || since))
+          {
+             _indent_line(buf, indent);
+             eina_strbuf_append(buf, " *\n");
+          }
+     }
+
    while (par)
      {
         const Eolian_Documentation *adoc = eolian_parameter_documentation_get(par);

src/tests/eolian/data/class_simple_ref_eo.h

@@ -47,6 +47,7 @@ EWAPI const Efl_Class *class_simple_class_get(void);
  *
  * comment a.set
  *
+ * @param[in] obj The object.
  * @param[in] value Value description
  *
  * @return comment for property set return
@@ -60,6 +61,8 @@ EOAPI Eina_Bool efl_canvas_object_simple_a_set(Eo *obj, int value);
 /**
  * @brief Common desc for a
  *
+ * @param[in] obj The object.
+ *
  * @return Value description
  *
  * @ingroup Class_Simple
@@ -73,6 +76,7 @@ EOAPI void efl_canvas_object_simple_b_set(Eo *obj);
 /**
  * @brief comment foo
  *
+ * @param[in] obj The object.
  * @param[in] a a
  * @param[in,out] b
  * @param[out] c

src/tests/eolian/data/docs_ref.h

@@ -88,6 +88,7 @@ EWAPI const Efl_Class *docs_class_get(void);
 /**
  * @brief Method documentation.
  *
+ * @param[in] obj The object.
  * @param[in] a Param documentation.
  * @param[out] b
  * @param[out] c Another param documentation.
@@ -105,6 +106,7 @@ EOAPI int docs_meth(Eo *obj, int a, float *b, long *c);
  *
  * Set documentation.
  *
+ * @param[in] obj The object.
  * @param[in] val Value documentation.
  *
  * @since 1.18
@@ -118,6 +120,8 @@ EOAPI void docs_prop_set(Eo *obj, int val);
  *
  * Get documentation.
  *
+ * @param[in] obj The object.
+ *
  * @return Value documentation.
  *
  * @since 1.18

src/tests/eolian/data/docs_ref_legacy.h

@@ -74,6 +74,7 @@ typedef struct _Opaque Opaque;
 /**
  * @brief Method documentation.
  *
+ * @param[in] obj The object.
  * @param[in] a Param documentation.
  * @param[out] b
  * @param[out] c Another param documentation.
@@ -91,6 +92,7 @@ EAPI int docs_meth(Docs *obj, int a, float *b, long *c);
  *
  * Set documentation.
  *
+ * @param[in] obj The object.
  * @param[in] val Value documentation.
  *
  * @since 1.18
@@ -104,6 +106,8 @@ EAPI void docs_prop_set(Docs *obj, int val);
  *
  * Get documentation.
  *
+ * @param[in] obj The object.
+ *
  * @return Value documentation.
  *
  * @since 1.18

src/tests/eolian/data/struct_ref.c

@@ -33,6 +33,7 @@ EWAPI const Efl_Class *struct_class_get(void);
 /**
  * @brief Foo docs. This is @c monospace. This is alone-standing $.
  *
+ * @param[in] obj The object.
  * @param[in] idx
  *
  * @ingroup Struct