launcher: print build info at startup

src/main/launcher/Module.mk

@@ -20,4 +20,8 @@ src_launcher    := \
     options.c \
     property.c \
     stubs.c \
+    version.c \
+
+volatile_launcher := \
+    version.c \
 

src/main/launcher/main.c

@@ -14,6 +14,7 @@
 #include "launcher/options.h"
 #include "launcher/property.h"
 #include "launcher/stubs.h"
+#include "launcher/version.h"
 
 #include "util/codepage.h"
 #include "util/defs.h"
@@ -139,6 +140,10 @@ int main(int argc, const char **argv)
     struct property_node *ea3_config_root;
 
     log_to_writer(log_writer_file, stdout);
+    log_info(
+        "launcher build date %s, gitrev %s",
+        launcher_build_date,
+        launcher_gitrev);
 
     /* Read command line */
 

src/main/launcher/version.c

@@ -0,0 +1,4 @@
+#include "util/defs.h"
+
+const char *launcher_build_date = __DATE__ " " __TIME__;
+const char *launcher_gitrev = STRINGIFY(GITREV);

src/main/launcher/version.h

@@ -0,0 +1,4 @@
+#pragma once
+
+extern const char *launcher_build_date;
+extern const char *launcher_gitrev;