* Remove "auto" and "guess" as synonyms for 0 in the handling of

  build-cores and --cores.  They're superfluous and just complicate
  the parsing.

2 files changed, 8 insertions, 20 deletions

diff --git a/nix.conf.example b/nix.conf.example
index 6175d861491b..7063bed54c4d 100644
--- a/nix.conf.example
+++ b/nix.conf.example
@@ -62,12 +62,11 @@
 ### Option `build-cores'
 #
 # This option defines the number of CPU cores to utilize in parallel
-# within a build job, i.e. by passing an appropriate `-jN' flag to
-# GNU make. The default is 1, meaning that parallel building within
-# jobs is disabled. Passing the special values `0', `auto', or
-# `guess' causes Nix to try and auto-detect the number of available
-# cores on the local host. This setting can be overridden using the
-# `--cores' command line switch.
+# within a build job, i.e. by passing an appropriate `-jN' flag to GNU
+# make. The default is 1, meaning that parallel building within jobs
+# is disabled.  Passing the special value `0' causes Nix to try and
+# auto-detect the number of available cores on the local host.  This
+# setting can be overridden using the `--cores' command line switch.
 #build-cores = 1
 
 
diff --git a/src/libmain/shared.cc b/src/libmain/shared.cc
index 19aa1e71cca9..eddc4e64b3d7 100644
--- a/src/libmain/shared.cc
+++ b/src/libmain/shared.cc
@@ -135,12 +135,7 @@ static void initAndRun(int argc, char * * argv)
     /* Get some settings from the configuration file. */
     thisSystem = querySetting("system", SYSTEM);
     maxBuildJobs = queryIntSetting("build-max-jobs", 1);
-    string tmp = querySetting("build-cores", "/UNDEFINED");
-    std::transform(tmp.begin(), tmp.end(), tmp.begin(), tolower);
-    if (tmp == "auto" || tmp == "guess")
-      buildCores = 0;
-    else
-      buildCores = queryIntSetting("build-cores", 1);
+    buildCores = queryIntSetting("build-cores", 1);
     maxSilentTime = queryIntSetting("build-max-silent-time", 0);
 
     /* Catch SIGINT. */
@@ -232,14 +227,8 @@ static void initAndRun(int argc, char * * argv)
             tryFallback = true;
         else if (arg == "--max-jobs" || arg == "-j")
             maxBuildJobs = getIntArg<unsigned int>(arg, i, args.end());
-        else if (arg == "--cores") {
-            string tmp = *(++i);
-            std::transform(tmp.begin(), tmp.end(), tmp.begin(), tolower);
-            if (tmp == "auto" || tmp == "guess")
-              buildCores = 0u;
-            else
-              buildCores = getIntArg<unsigned int>(arg, --i, args.end());
-        }
+        else if (arg == "--cores")
+            buildCores = getIntArg<unsigned int>(arg, i, args.end());
         else if (arg == "--readonly-mode")
             readOnlyMode = true;
         else if (arg == "--max-silent-time")