build: enable using $(CONFIG_FOO) on the rhs of config files

Signed-off-by: Paolo Bonzini <[email protected]>
jowinter · Apr 8, 2013 · bb585a7 · bb585a7
1 parent 9196dd4
commit bb585a7
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/Makefile b/Makefile
@@ -76,7 +76,10 @@ config-all-devices.mak:
 	$(call quiet-command,echo '# no devices' > $@,"  GEN   $@")
 else
 config-all-devices.mak: $(SUBDIR_DEVICES_MAK)
-	$(call quiet-command,cat $(SUBDIR_DEVICES_MAK) | grep =y | sort -u > $@,"  GEN   $@")
+	$(call quiet-command, sed -n \
+             's|^\([^=]*\)=\(.*\)$$|\1:=$$(findstring y,$$(\1)\2)|p' \
+             $(SUBDIR_DEVICES_MAK) | sort -u > $@, \
+             "  GEN   $@")
 endif
 
 -include $(SUBDIR_DEVICES_MAK_DEP)