ported Nim to proprietary CrossOS [backport] (#18889)

ci/funs.sh

@@ -74,6 +74,8 @@ _nimBuildCsourcesIfNeeded(){
     makeX=gmake
   elif [ "$unamestr" = 'NetBSD' ]; then
     makeX=gmake
+  elif [ "$unamestr" = 'CROSSOS' ]; then
+    makeX=gmake
   else
     makeX=make
   fi

compiler/installer.ini

@@ -13,6 +13,7 @@ Platforms: """
   netbsd: i386;amd64
   openbsd: i386;amd64;arm;arm64
   dragonfly: i386;amd64
+  crossos: amd64
   haiku: i386;amd64
   android: i386;arm;arm64
   nintendoswitch: arm64

compiler/options.nim

@@ -577,11 +577,13 @@ proc isDefined*(conf: ConfigRef; symbol: string): bool =
                             osQnx, osAtari, osAix,
                             osHaiku, osVxWorks, osSolaris, osNetbsd,
                             osFreebsd, osOpenbsd, osDragonfly, osMacosx, osIos,
-                            osAndroid, osNintendoSwitch, osFreeRTOS}
+                            osAndroid, osNintendoSwitch, osFreeRTOS, osCrossos}
     of "linux":
       result = conf.target.targetOS in {osLinux, osAndroid}
     of "bsd":
-      result = conf.target.targetOS in {osNetbsd, osFreebsd, osOpenbsd, osDragonfly}
+      result = conf.target.targetOS in {osNetbsd, osFreebsd, osOpenbsd, osDragonfly, osCrossos}
+    of "freebsd":
+      result = conf.target.targetOS in {osFreebsd, osCrossos}
     of "emulatedthreadvars":
       result = platform.OS[conf.target.targetOS].props.contains(ospLacksThreadVars)
     of "msdos": result = conf.target.targetOS == osDos

compiler/platform.nim

@@ -20,7 +20,7 @@ type
   TSystemOS* = enum # Also add OS in initialization section and alias
                     # conditionals to condsyms (end of module).
     osNone, osDos, osWindows, osOs2, osLinux, osMorphos, osSkyos, osSolaris,
-    osIrix, osNetbsd, osFreebsd, osOpenbsd, osDragonfly, osAix, osPalmos, osQnx,
+    osIrix, osNetbsd, osFreebsd, osOpenbsd, osDragonfly, osCrossos, osAix, osPalmos, osQnx,
     osAmiga, osAtari, osNetware, osMacos, osMacosx, osIos, osHaiku, osAndroid, osVxWorks
     osGenode, osJS, osNimVM, osStandalone, osNintendoSwitch, osFreeRTOS, osAny
 
@@ -105,6 +105,10 @@ const
       scriptExt: ".sh", curDir: ".",
       exeExt: "", extSep: ".",
       props: {ospNeedsPIC, ospPosix}),
+     (name: "CROSSOS", parDir: "..", dllFrmt: "lib$1.so", altDirSep: "/",
+      objExt: ".o", newLine: "\x0A", pathSep: ":", dirSep: "/",
+      scriptExt: ".sh", curDir: ".", exeExt: "", extSep: ".",
+      props: {ospNeedsPIC, ospPosix}),
      (name: "AIX", parDir: "..", dllFrmt: "lib$1.so", altDirSep: "/",
       objExt: ".o", newLine: "\x0A", pathSep: ":", dirSep: "/",
       scriptExt: ".sh", curDir: ".", exeExt: "", extSep: ".",

lib/pure/os.nim

@@ -3007,7 +3007,7 @@ when not weirdTarget and (defined(freebsd) or defined(dragonfly) or defined(netb
   proc sysctl(name: ptr cint, namelen: cuint, oldp: pointer, oldplen: ptr csize_t,
               newp: pointer, newplen: csize_t): cint
        {.importc: "sysctl",header: """#include <sys/types.h>
-                                      #include <sys/sysctl.h>"""}
+                                      #include <sys/sysctl.h>""".}
   const
     CTL_KERN = 1
     KERN_PROC = 14

tools/niminst/buildsh.nimf

@@ -109,6 +109,11 @@ case $uos in
     CC="clang"
     LINK_FLAGS="$LINK_FLAGS -lm"
     ;;
+  *crossos* )
+    myos="crossos"
+    CC="clang"
+    LINK_FLAGS="$LINK_FLAGS -lm"
+    ;;
   *openbsd* )
     myos="openbsd"
     CC="clang"