qt5_tool: Fix bootstrapping on new machines

Change df3090cb05817277b0dd3586e9e2e7a673955a24 (adding incredibuild)
broke bootstrapping on new machines since it tries to read the config
file in checkMake(). Add a check for existence of the config file.

Change-Id: I08bd2b0a56f50a8f5f61c3c73c2714719bc97ab0
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@qt.io>

1 files changed, 6 insertions, 2 deletions

diff --git a/bin/qt5_tool b/bin/qt5_tool
index 6d05ddf..07fe253 100755
--- a/bin/qt5_tool
+++ b/bin/qt5_tool
@@ -158,8 +158,12 @@ my $minGW = 0;
 
 sub checkMake
 {
-    my $useIncredibuild = readQt5ToolConfigBool('incredibuild') || defined($optIncredibuild);
-    my $jobs = readQt5ToolConfigInt('jobs', -1);
+    my $useIncredibuild = undef;
+    my $jobs = -1;
+    if (defined($configFile) && -f $configFile) {
+        $useIncredibuild = readQt5ToolConfigBool('incredibuild') || defined($optIncredibuild);
+        $jobs = readQt5ToolConfigInt('jobs', -1);
+    }
     if ($os == $OS_WINDOWS) {
         if (which('g++')) {
             $make = 'mingw32-make';