Added Makefile re-export (project.h) `PROG_COMPILED_TIMESTAMP` (u64): UTC unix timestamp (seconds) when TU was compiled.

Show "compiled when" timestamp in usage messaged. TODO: Convert to human-readable UTC time.

Fortune for naka's current commit: Blessing − 吉

Makefile

@@ -13,6 +13,8 @@ VERSION_REV=0
 
 VERSION:=$(VERSION_MAJ).$(VERSION_MIN).$(VERSION_BF).$(VERSION_REV)
 
+COMP_TIME:=$(shell date -u +%s)
+
 SRC_C   = $(wildcard src/*.c) $(wildcard src/tests/*.c)
 SRC_CXX = $(wildcard src/*.cpp)
 
@@ -21,7 +23,8 @@ INCLUDE=include
 META_FLAGS:=-D_PROJECT_AUTHOR="\"$(AUTHOR)\"" -D_PROJECT_DESCRIPTION="\"$(DESCRIPTION)\"" -D_PROJECT_NAME="\"$(PROJECT)\"" \
 		-D_PROJECT_LICENSE="\"$(LICENSE)\"" \
 		-D_VERSION_MAJOR=$(VERSION_MAJ) -D_VERSION_MINOR=$(VERSION_MIN) \
-		-D_VERSION_BUGFIX=$(VERSION_BF) -D_VERSION_REVISION=$(VERSION_REV)
+		-D_VERSION_BUGFIX=$(VERSION_BF) -D_VERSION_REVISION=$(VERSION_REV) \
+		-D_PROJECT_COMPILED=$(COMP_TIME)
 
 COMMON_FLAGS+= -W -Wall -fno-strict-aliasing $(addprefix -I,$(INCLUDE)) $(META_FLAGS)
 

include/project.h

@@ -2,6 +2,8 @@
 #ifndef _PROJECT_H
 #define _PROJECT_H
 
+#include "macros.h"
+#include "ints.h"
 #include "version.h"
 
 /// Project version, as a raw version identifier (u32).
@@ -19,5 +21,7 @@
 #define PROG_AUTHOUR _PROJECT_AUTHOR
 /// Project license
 #define PROG_LICENSE _PROJECT_LICENSE
+/// Compiled time (UTC unix timestamp)
+#define PROG_COMPILED_TIMESTAMP AS(_PROJECT_COMPILED, u64)
 
 #endif /* _PROJECT_H */

src/main.c

@@ -15,9 +15,10 @@
 void prog_info(FILE* out)
 {
 	fprintf(out, PROG_NAME " v%s - " PROG_DESCRIPTION 
-		"\n written by %s with <3\n  license %s.\n", 
+		"\n written by %s with <3 (compiled at %lu UTC (unix ts))\n  license %s.\n", 
 			v_ctoss(v_rawtoc(PROG_VERSION)),
 			PROG_AUTHOUR,
+			PROG_COMPILED_TIMESTAMP,
 			PROG_LICENSE);
 }