fix nim-lang#12426 (nim-lang#12462)

(cherry picked from commit ec20fd3)

compiler/cgen.nim

@@ -997,21 +997,22 @@ proc genProcAux(m: BModule, prc: PSym) =
   closureSetup(p, prc)
   genStmts(p, procBody) # modifies p.locals, p.init, etc.
   var generatedProc: Rope
+  generatedProc.genCLineDir prc.info, m.config
   if sfNoReturn in prc.flags:
     if hasDeclspec in extccomp.CC[p.config.cCompiler].props:
       header = "__declspec(noreturn) " & header
   if sfPure in prc.flags:
     if hasDeclspec in extccomp.CC[p.config.cCompiler].props:
       header = "__declspec(naked) " & header
-    generatedProc = ropecg(p.module, "$N$1 {$n$2$3$4}$N$N",
+    generatedProc.add ropecg(p.module, "$1 {$n$2$3$4}$N$N",
                          [header, p.s(cpsLocals), p.s(cpsInit), p.s(cpsStmts)])
   else:
     if m.hcrOn and isReloadable(m, prc):
       # Add forward declaration for "_actual"-suffixed functions defined in the same module (or inline).
       # This fixes the use of methods and also the case when 2 functions within the same module
       # call each other using directly the "_actual" versions (an optimization) - see issue #11608
       addf(m.s[cfsProcHeaders], "$1;\n", [header])
-    generatedProc = ropecg(p.module, "$N$1 {$N", [header])
+    generatedProc.add ropecg(p.module, "$1 {", [header])
     add(generatedProc, initGCFrame(p))
     if optStackTrace in prc.options:
       add(generatedProc, p.s(cpsLocals))

tests/untestable/gdb/gdb_pretty_printer_test.py

@@ -22,6 +22,9 @@
 ]
 
 for i, expected in enumerate(outputs):
+  functionSymbol = gdb.selected_frame().block().function
+  assert functionSymbol.line == 21
+
   if i == 5:
     # myArray is passed as pointer to int to myDebug. I look up myArray up in the stack
     gdb.execute("up")