qmake/MSVC: fix parsing of the /openmp option

Task-number: QTBUG-29143

Change-Id: I6b1ce0babf51701fa404b821b22060a87c4f46b2
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
(cherry picked from commit be8c47b1404257e33d6b7866101167726a3d1c30)
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>

1 files changed, 12 insertions, 3 deletions

diff --git a/qmake/generators/win32/msvc_objectmodel.cpp b/qmake/generators/win32/msvc_objectmodel.cpp
index ae237e7..af475d0 100644
--- a/qmake/generators/win32/msvc_objectmodel.cpp
+++ b/qmake/generators/win32/msvc_objectmodel.cpp
@@ -1080,11 +1080,20 @@ bool VCCLCompilerTool::parseOption(const char* option)
         }
         found = false; break;
     case 'o':
-        if (second == 'p' && third == 'e' && fourth == 'n') {
-            OpenMP = _True;
-            break;
+    {
+        const char *str = option + 2;
+        const size_t len = strlen(str);
+        if (len >= 5 && len <= 6 && strncmp(str, "penmp", 5) == 0) {
+            if (len == 5) {
+                OpenMP = _True;
+                break;
+            } else if (str[5] == '-') {
+                OpenMP = _False;
+                break;
+            }
         }
         found = false; break;
+    }
     case 's':
         if(second == 'h' && third == 'o' && fourth == 'w') {
             ShowIncludes = _True;