Add --use-system-nim setting

src/nimble.nim

@@ -344,7 +344,7 @@ proc allDependencies(pkgInfo: PackageInfo, options: Options): HashSet[PackageInf
     result.incl pkgInfo.processFreeDependencies(requires, options)
 
 proc useLockedNimIfNeeded(pkgInfo: PackageInfo, options: var Options) =
-  if pkgInfo.lockedDeps.len > 0:
+  if pkgInfo.lockedDeps.len > 0 and not options.useSystemNim:
     var deps = pkgInfo.processLockedDependencies(options, true)
     if deps.len != 0:
       # process the first entry (hash.pop is triggering warnings)

src/nimblepkg/options.nim

@@ -28,6 +28,7 @@ type
     pkgInfoCache*: TableRef[string, PackageInfo]
     showHelp*: bool
     lockFileName*: string
+    useSystemNim*: bool
     showVersion*: bool
     offline*: bool
     noColor*: bool
@@ -112,7 +113,7 @@ Usage: nimble [nimbleopts] COMMAND [cmdopts]
 Commands:
   install      [pkgname, ...]     Installs a list of packages.
                [-d, --depsOnly]   Only install dependencies. Leave out pkgname
-                                  to install deps for a local nimble package. 
+                                  to install deps for a local nimble package.
                [-p, --passNim]    Forward specified flag to compiler.
                [--noRebuild]      Don't rebuild binaries if they're up-to-date.
   develop      [pkgname, ...]     Clones a list of packages for development.
@@ -228,6 +229,8 @@ Nimble Options:
       --noColor                   Don't colorise output.
       --noSSLCheck                Don't check SSL certificates.
       --lock-file                 Override the lock file name.
+      --use-system-nim            Use system nim and ignore nim from the lock
+                                  file if any
 
 For more information read the Github readme:
   https://github.com/nim-lang/nimble#readme
@@ -532,6 +535,7 @@ proc parseFlag*(flag, val: string, result: var Options, kind = cmdLongOption) =
   of "tarballs", "t": result.enableTarballs = true
   of "package", "p": result.package = val
   of "lock-file": result.lockFileName = val
+  of "use-system-nim": result.useSystemNim = true
   else: isGlobalFlag = false
 
   var wasFlagHandled = true

tests/nimdep/nimdep.nimble

@@ -9,7 +9,7 @@ bin           = @["demo"]
 
 # Dependencies
 
-requires "nim == 1.7.1"
+requires "nim"
 
 task version, "Test nim version":
   exec "nim --version"

tests/tlockfile.nim

@@ -618,3 +618,7 @@ requires "nim >= 1.5.1"
       # check the nim version
       let (outputVersion, _) = execNimble("version")
       check outputVersion.contains(getRevision("nim"))
+
+      let (outputGlobalNim, exitCodeGlobalNim) = execNimbleYes("-y", "--use-system-nim", "build")
+      check exitCodeGlobalNim == QuitSuccess
+      check not outputGlobalNim.contains("bin/nim for compilation")