refs #9906; --errorMax:10 allows stopping after 10 errors

compiler/commands.nim

@@ -617,6 +617,11 @@ proc processSwitch*(switch, arg: string, pass: TCmdLinePass, info: TLineInfo;
   of "run", "r":
     expectNoArg(conf, switch, arg, pass, info)
     incl(conf.globalOptions, optRun)
+  of "errormax":
+    # Note: `nim check` (etc) can overwrite this;
+    # `0` is meaningless and has same effect as `1`
+    expectArg(conf, switch, arg, pass, info)
+    conf.errorMax = parseInt(arg)
   of "verbosity":
     expectArg(conf, switch, arg, pass, info)
     let verbosity = parseInt(arg)

doc/advopt.txt

@@ -103,6 +103,7 @@ Advanced options:
                             value = number of processors (0 for auto-detect)
   --incremental:on|off      only recompile the changed modules (experimental!)
   --verbosity:0|1|2|3       set Nim's verbosity level (1 is default)
+  --errorMax:int            stop after n (>=1) errors in semantic pass
   --experimental:$1
                             enable experimental language feature
   -v, --version             show detailed version information