Merge branch '3.3-maint'

* 3.3-maint:
  Hash source path when generating dependencies to avoid false positive
  test: Handle CC="gcc -std=gnu99" gracefully

diff --cc NEWS.txt
index ef89bf5e58e6e52e033f0b383193ed900b6cf706,c33cd1c2fab16085e15799cccec19d4ff23515c0..a69dd818da4ccbac0fd66e183549091ef2acd720
--- 1/NEWS.txt
--- 2/NEWS.txt
+++ b/NEWS.txt
@@@ -1,16 -1,9 +1,19 @@@
  ccache news
  ===========
  
 +Unreleased 3.4
 +--------------
 +
 +New features and improvements
 +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 +
 +- The compiler option form `--sysroot arg` is now handled like the documented
 +  `--sysroot=arg` form.
 +
 +
+ Unreleased 3.3.2
+ ----------------
+ 
  Bug fixes
  ~~~~~~~~~