[make] USE_GIT_VERSION option to use commit info in version (closes #1702)

Signed-off-by: R4SAS <r4sas@i2pmail.org>

Makefile

@@ -35,6 +35,12 @@ USE_MESHNET	:= $(or $(USE_MESHNET),no)
 USE_UPNP        := $(or $(USE_UPNP),no)
 DEBUG           := $(or $(DEBUG),yes)
 
+# for debugging purposes only, when commit hash needed in trunk builds in i2pd version string
+USE_GIT_VERSION := $(or $(USE_GIT_VERSION),no)
+
+# for MacOS only, waiting for "1", not "yes"
+HOMEBREW        := $(or $(HOMEBREW),0)
+
 ifeq ($(DEBUG),yes)
 	CXX_DEBUG = -g
 else
@@ -66,6 +72,11 @@ ifeq ($(USE_MESHNET),yes)
 	NEEDED_CXXFLAGS += -DMESHNET
 endif
 
+ifeq ($(USE_GIT_VERSION),yes)
+	GIT_VERSION := $(shell git describe --tags)
+	NEEDED_CXXFLAGS += -DGITVER=\"$(GIT_VERSION)\"
+endif
+
 NEEDED_CXXFLAGS += -MMD -MP -I$(LIB_SRC_DIR) -I$(LIB_CLIENT_SRC_DIR) -I$(LANG_SRC_DIR)
 
 LIB_OBJS        += $(patsubst %.cpp,obj/%.o,$(LIB_SRC))

daemon/Daemon.cpp

@@ -134,7 +134,7 @@ namespace util
 			// use stdout -- default
 		}
 
-		LogPrint(eLogNone,  "i2pd v", VERSION, " starting");
+		LogPrint(eLogNone,  "i2pd v", VERSION, " (", I2P_VERSION, ") starting");
 		LogPrint(eLogDebug, "FS: main config file: ", config);
 		LogPrint(eLogDebug, "FS: data directory: ", datadir);
 		LogPrint(eLogDebug, "FS: certificates directory: ", certsdir);

libi2pd/version.h

@@ -19,7 +19,12 @@
 #define I2PD_VERSION_MINOR 39
 #define I2PD_VERSION_MICRO 0
 #define I2PD_VERSION_PATCH 0
-#define I2PD_VERSION MAKE_VERSION(I2PD_VERSION_MAJOR, I2PD_VERSION_MINOR, I2PD_VERSION_MICRO)
+#ifdef GITVER
+	#define I2PD_VERSION GITVER
+#else
+	#define I2PD_VERSION MAKE_VERSION(I2PD_VERSION_MAJOR, I2PD_VERSION_MINOR, I2PD_VERSION_MICRO)
+#endif
+
 #define VERSION I2PD_VERSION
 
 #ifdef MESHNET