adds --legacy:noAsmSemSymbol

compiler/condsyms.nim

@@ -173,3 +173,5 @@ proc initDefines*(symbols: StringTableRef) =
   defineSymbol("nimHasXorSet")
 
   defineSymbol("nimHasLegacyNoStrictDefs")
+
+  defineSymbol("nimHasAsmSemSymbol")

compiler/nim.cfg

@@ -10,7 +10,6 @@ define:nimPreviewProcConversion
 define:nimPreviewRangeDefault
 define:nimPreviewNonVarDestructor
 define:nimPreviewCheckedClose
-define:nimPreviewAsmSemSymbol
 threads:off
 
 #import:"$projectpath/testability"

compiler/options.nim

@@ -250,6 +250,8 @@ type
       ## Old transformation for closures in JS backend
     noStrictDefs
       ## disable "strictdefs"
+    noAsmSemSymbol
+      ## disable type checking for backticked symbols in the `asm/emit` statements
 
   SymbolFilesOption* = enum
     disabledSf, writeOnlySf, readOnlySf, v2Sf, stressTest

compiler/pragmas.nim

@@ -637,10 +637,11 @@ proc semAsmOrEmit*(con: PContext, n: PNode, marker: char): PNode =
         # XXX what to do here if 'amb' is true?
         if e != nil:
           incl(e.flags, sfUsed)
-          if isDefined(con.config, "nimPreviewAsmSemSymbol"):
-            result.add con.semExprWithType(con, newSymNode(e), {efTypeAllowed})
-          else:
+
+          if noAsmSemSymbol in con.config.legacyFeatures:
             result.add newSymNode(e)
+          else:
+            result.add con.semExprWithType(con, newSymNode(e), {efTypeAllowed})
         else:
           result.add newStrNode(nkStrLit, sub)
       else: