make: Document imported variables

In src/mesa/Android.mk, it is non-trivial to determine which variables are
imported by `include sources.mak`. So document them.

Reviewed-by: Chia-I Wu <olv@lunarg.com>
Signed-off-by: Chad Versace <chad@chad-versace.us>

diff --git a/src/mesa/Android.mk b/src/mesa/Android.mk
index 5f0f4aff908783051ea8650b602f26e1c34ff3d3..f21ba3aa0d6c0ca09209fb13ebc91d25900cf5f5 100644 (file)
--- a/src/mesa/Android.mk
+++ b/src/mesa/Android.mk
@@ -25,6 +25,12 @@
 
 LOCAL_PATH := $(call my-dir)
 
+# Import the following variables:
+#     MESA_CXX_SOURCES
+#     MESA_GALLIUM_CXX_SOURCES
+#     MESA_GALLIUM_SOURCES
+#     MESA_SOURCES
+#     X86_SOURCES
 include $(LOCAL_PATH)/sources.mak
 
 common_CFLAGS := \