fixed version string macro when git is not installed

server/Makefile

@@ -12,9 +12,11 @@ V ?= 2
 LDLIBS = -pthread -lrt -lm -lconfig
 CFLAGS  = -std=c99 -Iinclude/ -MMD -Wall
 CFLAGS += -D_XOPEN_SOURCE=500 -D_GNU_SOURCE -DV=$(V)
-CFLAGS += -D__GIT_REV__='"-$(shell git rev-parse --short HEAD)"'
 
-# Conditional flags
+# Add git commit hash
+ifneq (,$(shell which git))
+	CFLAGS += -D_GIT_REV='"$(shell git rev-parse --short HEAD)"'
+endif
 ifdef DEBUG
 	CFLAGS += -O0 -g
 else

server/include/config.h

@@ -11,9 +11,12 @@
 #ifndef _CONFIG_H_
 #define _CONFIG_H_
 
-/** The version number of the s2ss server */
+#ifndef _GIT_REV
+ #define _GIT_REV	"nogit"
+#endif
 
-#define VERSION		"v0.4" __GIT_REV__
+/** The version number of the s2ss server */
+#define VERSION		"v0.4-" _GIT_REV
 
 /** Maximum number of double values in a struct msg */
 #define MAX_VALUES	64

server/include/utils.h

@@ -55,8 +55,14 @@
  #define LEFT(n)	""
 #endif
 
+/* CPP stringification */
+#define XSTR(x)		STR(x)
+#define  STR(x)		#x
+
+/** Calculate the number of elements in an array. */
 #define ARRAY_LEN(a)	( sizeof (a) / sizeof (a)[0] )
 
+/** Swap two values by using a local third one. */
 #define SWAP(a, b)	do { \
 	 			__typeof__(a) tmp = a; \
 				a = b; \