Pass version in from build

Makefile

@@ -3,7 +3,7 @@ CC             ?= gcc
 VERSION         = $(shell git describe --tags --abbrev=0)
 GITCOUNT        = $(shell git rev-list HEAD --count)
 UNAME           = $(shell uname)
-
+VERSION_STR	    = '$(VERSION).$(GITCOUNT)'
 OBJS            = main.o util.o radio.o dfu-libusb.o uv380.o md380.o rd5r.o \
                   gd77.o hid.o serial.o d868uv.o dm1801.o
 CFLAGS         ?= -g -O -Wall -Werror 
@@ -61,7 +61,7 @@ install:	dmrconfig
 
 .PHONY: $(RUST_RELEASE)
 target/release/libdmrconfig.a:
-	cargo build --verbose --release
+	VERSION=$(VERSION_STR) cargo build --verbose --release
 
 ###
 d868uv.o: d868uv.c radio.h util.h d868uv-map.h

main.c

@@ -37,14 +37,13 @@ extern char *optarg;
 extern int optind;
 
 extern void print_message_from_rust();
-extern void print_usage(const char* version);
-extern void print_usage(const char* version);
+extern void print_usage();
 extern int rust_main(int argc, char** argv);
 
 int trace_flag = 0;
 
 void usage() {
-  print_usage((const char*)version);
+  print_usage();
 }
 
 int main(int argc, char **argv) {

src/lib.rs

@@ -1,4 +1,3 @@
-use std::ffi::CStr;
 use libc::{c_int, c_char};
 use getopts::Options;
 use std::process::exit;
@@ -6,14 +5,15 @@ use std::process::exit;
 mod radio;
 
 const COPYRIGHT: &'static str = "Copyright (C) 2018 Serge Vakulenko KK6ABQ";
+const VERSION: Option<&'static str> = option_env!("VERSION");
 
 extern {
   fn old_c_main(argc: c_int, argv: *const *const c_char) -> c_int;
 }
 
 #[no_mangle]
-pub extern "C" fn print_usage(version_ptr: *const c_char) {
-  let version: String = unsafe { CStr::from_ptr(version_ptr) }.to_string_lossy().to_string();
+pub extern "C" fn print_usage() {
+  let version = VERSION.unwrap_or("-----");
 
   print!("DMR Config, Version {}, {}", version, COPYRIGHT);
 
@@ -85,8 +85,7 @@ pub extern "C" fn rust_main(argc: c_int, argv: *const *const c_char) -> c_int {
 
   if [read_flag, write_flag, config_flag, csv_flag, verify_flag].iter().filter(|x| **x).count() > 1 {
     eprintln!("Only one of -r, -w, -c, -v or -u options is allowed.");
-    exit(-1);
-    //print_usage();
+    print_usage();
   }
 
   unsafe {