add hacking note

diff --git a/HACKING b/HACKING
index 6707c7b..84534e6 100644 (file)
--- a/HACKING
+++ b/HACKING
@@ -2,6 +2,10 @@ Generating the docs:
   sudo apt-get install asciidoc --no-install-recommends
   ./ninja doc
 
+Adjusting build flags:
+  Just a hack, but edit config.ninja (which was generated by bootstrap.sh)
+  to turn on debugging symbols.
+
 Test-driven development:
   Set your build command to
     ./ninja ninja_test && ./ninja_test --gtest_filter=MyTest.Name