Merge branch 'jk/no-common'

Dev support to catch a tentative definition of a variable in our C
code as an error.

* jk/no-common:
  config.mak.dev: build with -fno-common

diff --cc config.mak.dev
index 89b218d11a5313f327492795964793bec8670160,20168e5691eea53318144fbf3784b469c3e8bf84..89fefacd9447ff76d783b78e9d8db3d70ed5167f
--- 1/config.mak.dev
--- 2/config.mak.dev
+++ b/config.mak.dev
@@@ -15,7 -15,10 +15,8 @@@ DEVELOPER_CFLAGS += -Wpointer-arit
  DEVELOPER_CFLAGS += -Wstrict-prototypes
  DEVELOPER_CFLAGS += -Wunused
  DEVELOPER_CFLAGS += -Wvla
+ DEVELOPER_CFLAGS += -fno-common
  
 -DEVELOPER_CFLAGS += -DENABLE_SHA256
 -
  ifndef COMPILER_FEATURES
  COMPILER_FEATURES := $(shell ./detect-compiler $(CC))
  endif