mmc-utils: Change version string to git hash

Since mmc-utils versioning has always been 0.1 and changes are not
made frequently and formal releases do not happen, packaged versions
are just pulled from git anyway, using the git hash for version is
probably the best idea for now.

Signed-off-by: Christian Loehle <cloehle@hyperstone.com>
Link: https://lore.kernel.org/r/28623fa7390242e9b003a44016c0235f@hyperstone.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
diff --git a/Makefile b/Makefile
index aa27ff2..d8d59a4 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,7 @@
 CC ?= gcc
+GIT_VERSION := "$(shell git describe --abbrev=6 --always --tags)"
 AM_CFLAGS = -D_FILE_OFFSET_BITS=64 -D_FORTIFY_SOURCE=2
-CFLAGS ?= -g -O2
+CFLAGS ?= -g -O2 -DVERSION=\"$(GIT_VERSION)\"
 objects = \
 	mmc.o \
 	mmc_cmds.o \
diff --git a/mmc.c b/mmc.c
index b9aa478..795b4e3 100644
--- a/mmc.c
+++ b/mmc.c
@@ -26,8 +26,6 @@
 
 #include "mmc_cmds.h"
 
-#define MMC_VERSION	"0.1"
-
 #define BASIC_HELP 0
 #define ADVANCED_HELP 1
 
@@ -319,7 +317,7 @@
 
 	printf("\n\t%s help|--help|-h\n\t\tShow the help.\n",np);
 	printf("\n\t%s <cmd> --help\n\t\tShow detailed help for a command or subset of commands.\n",np);
-	printf("\n%s\n", MMC_VERSION);
+	printf("\n%s\n", VERSION);
 }
 
 static int split_command(char *cmd, char ***commands)
@@ -500,7 +498,7 @@
 	}
 
 	if(helprequested){
-		printf("\n%s\n", MMC_VERSION);
+		printf("\n%s\n", VERSION);
 		return 0;
 	}