X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=scons%2Fsource_list.py;h=e16d1f9b6d2b6a31dc387323a88fcf6df94ea2a4;hb=c00ee00031dd38a3c12d6661eba5f43d8a422e02;hp=1d5166ba1fefe34266a676ae8bc8abb55936dede;hpb=4c15a77f27204620ed35d97d75e521ca982e1cc5;p=mesa.git

diff --git a/scons/source_list.py b/scons/source_list.py
index 1d5166ba1fe..e16d1f9b6d2 100644
--- a/scons/source_list.py
+++ b/scons/source_list.py
@@ -13,6 +13,7 @@ The goal is to allow Makefile's and SConscript's to share source listing.
 
 class SourceListParser(object):
     def __init__(self):
+        self.symbol_table = {}
         self._reset()
 
     def _reset(self, filename=None):
@@ -20,7 +21,6 @@ class SourceListParser(object):
 
         self.line_no = 1
         self.line_cont = ''
-        self.symbol_table = {}
 
     def _error(self, msg):
         raise RuntimeError('%s:%d: %s' % (self.filename, self.line_no, msg))
@@ -63,7 +63,7 @@ class SourceListParser(object):
             self._error('not a variable definition')
 
         if op_pos > 0:
-            if line[op_pos - 1] in [':', '+']:
+            if line[op_pos - 1] in [':', '+', '?']:
                 op_pos -= 1
         else:
             self._error('only =, :=, and += are supported')
@@ -77,6 +77,9 @@ class SourceListParser(object):
             self.symbol_table[sym] = val
         elif op == '+=':
             self.symbol_table[sym] += ' ' + val
+        elif op == '?=':
+            if sym not in self.symbol_table:
+                self.symbol_table[sym] = val
 
     def _parse_line(self, line):
         """Parse a source list line."""
@@ -122,3 +125,6 @@ class SourceListParser(object):
                 raise
 
         return self.symbol_table
+
+    def add_symbol(self, name, value):
+        self.symbol_table[name] = value