gbuild-to-ide: handle -U undefs correctly

Previously, defines string like this:

  -DDBG_UTIL -DNOMINMAX -D_DLL -UNOMINMAX

would produce this defines list:

  DBG_UTIL;NOMINMAX;_DLL -UNOMINMAX

where last "define" is incorrect; proper list should be

  DBG_UTIL;_DLL

so that the undef'ed element would be properly eliminated from the
result. This patch takes care of this.

Change-Id: Ia66a1d6d0a6e0bbfd0022b22285b005609871336
Reviewed-on: https://gerrit.libreoffice.org/43923Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
Tested-by: Mike Kaganski <mike.kaganski@collabora.com>

bin/gbuild-to-ide

@@ -67,10 +67,15 @@ class GbuildParser:
         defs = {}
         alldefs = [defswitch.strip() for defswitch in defsline.strip().lstrip('-D').split(' -D') if len(defswitch) > 2]
         for d in alldefs:
-            defparts = d.split('=')
+            dparts = d.split(' -U')
+            """after dparts.pop(0), dparts will contain only undefs"""
+            defparts = dparts.pop(0).strip().split('=')
             if len(defparts) == 1:
                 defparts.append(None)
             defs[defparts[0]] = defparts[1]
+            """Drop undefed items (if any) from previous defs"""
+            for u in dparts:
+                defs.pop(u.strip(), '')
         defs["LIBO_INTERNAL_ONLY"] = None
         return defs
 

bin/gbuild-to-ideNS

@@ -106,10 +106,15 @@ class GbuildParser:
         defs = {}
         alldefs = [defswitch.strip() for defswitch in defsline.strip().lstrip('-D').split(' -D') if len(defswitch) > 2]
         for d in alldefs:
-            defparts = d.split('=')
+            dparts = d.split(' -U')
+            """after dparts.pop(0), dparts will contain only undefs"""
+            defparts = dparts.pop(0).strip().split('=')
             if len(defparts) == 1:
                 defparts.append(None)
             defs[defparts[0]] = defparts[1]
+            """Drop undefed items (if any) from previous defs"""
+            for u in dparts:
+                defs.pop(u.strip(), '')
         defs["LIBO_INTERNAL_ONLY"] = None
         return defs