[CI] now enables NIM_COMPILE_TO_CPP=true to run without allow_failures (#10315)

* better fix for `nim cpp` bootstrap error: error: no member named raise_id
* [CI] now enables runs NIM_COMPILE_TO_CPP=true without allow_failures
* workaround refs #10343

koch.nim

@@ -281,19 +281,24 @@ proc boot(args: string) =
   let smartNimcache = (if "release" in args: "nimcache/r_" else: "nimcache/d_") &
                       hostOs & "_" & hostCpu
 
-  copyExe(findStartNim(), 0.thVersion)
-  for i in 0..2+ord(useCpp):
-    # do the first iteration in C mode in order to avoid problem #10315:
-    let defaultCommand = if useCpp and i > 0: "cpp" else: "c"
+  let nimStart = findStartNim()
+  copyExe(nimStart, 0.thVersion)
+  for i in 0..2:
+    let defaultCommand = if useCpp: "cpp" else: "c"
     let bootOptions = if args.len == 0 or args.startsWith("-"): defaultCommand else: ""
-
     echo "iteration: ", i+1
-    let extraOption = if i == 0:
-      "--skipUserCfg --skipParentCfg"
+    var extraOption = ""
+    if i == 0:
+      extraOption.add " --skipUserCfg --skipParentCfg"
         # Note(D20190115T162028:here): the configs are skipped for bootstrap
         # (1st iteration) to prevent newer flags from breaking bootstrap phase.
         # fixes #10030.
-    else: ""
+      let ret = execCmdEx(nimStart & " --version")
+      doAssert ret.exitCode == 0
+      let version = ret.output.splitLines[0]
+      if version.startsWith "Nim Compiler Version 0.19.0":
+        extraOption.add " -d:nimBoostrapCsources0_19_0"
+        # remove this when csources get updated
     exec i.thVersion & " $# $# $# --nimcache:$# compiler" / "nim.nim" %
       [bootOptions, extraOption, args, smartNimcache]
     if sameFileContent(output, i.thVersion):