fixes #2335

compiler/ccgstmts.nim

@@ -1001,12 +1001,19 @@ proc genAsmStmt(p: BProc, t: PNode) =
   else:
     lineF(p, cpsStmts, CC[cCompiler].asmStmtFrmt, [s])
 
+proc determineSection(n: PNode): TCFileSection =
+  result = cfsProcHeaders
+  if n.len >= 1 and n.sons[0].kind in {nkStrLit..nkTripleStrLit}:
+    if n.sons[0].strVal.startsWith("/*TYPESECTION*/"): result = cfsTypes
+    elif n.sons[0].strVal.startsWith("/*VARSECTION*/"): result = cfsVars
+
 proc genEmit(p: BProc, t: PNode) =
   var s = genAsmOrEmitStmt(p, t.sons[1])
   if p.prc == nil:
     # top level emit pragma?
-    genCLineDir(p.module.s[cfsProcHeaders], t.info)
+    let section = determineSection(t[1])
-    add(p.module.s[cfsProcHeaders], s)
+    genCLineDir(p.module.s[section], t.info)
+    add(p.module.s[section], s)
   else:
     genLineDir(p, t)
     line(p, cpsStmts, s)

doc/nimc.txt

@@ -386,6 +386,25 @@ Example:
 As can be seen from the example, to Nim symbols can be referred via backticks.
 Use two backticks to produce a single verbatim backtick.
 
+For a toplevel emit statement the section where in the generated C/C++ file
+the code should be emitted can be influenced via the
+prefixes ``/*TYPESECTION*/`` or ``/*VARSECTION*/``:
+
+.. code-block:: Nim
+  {.emit: """/*TYPESECTION*/
+  struct Vector3 {
+  public:
+    Vector3(): x(5) {}
+    Vector3(float x_): x(x_) {}
+    float x;
+  };
+  """.}
+
+  type Vector3 {.importcpp: "Vector3", nodecl} = object
+    x: cfloat
+
+  proc constructVector3(a: cfloat): Vector3 {.importcpp: "Vector3(@)", nodecl}
+
 
 ImportCpp pragma
 ----------------
@@ -611,7 +630,7 @@ Produces:
 Produces:
 
 .. code-block:: C
-  
+
   std::vector<int>::iterator x;