From a8e38d292e94146cf041a9789eb5eb976b64b07e Mon Sep 17 00:00:00 2001
From: Avril <flanchan@cumallover.me>
Date: Fri, 9 Jul 2021 18:15:48 +0100
Subject: [PATCH] Added Makefile re-export (project.h)
 `PROG_COMPILED_TIMESTAMP` (u64): UTC unix timestamp (seconds) when TU was
 compiled.
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Show "compiled when" timestamp in usage messaged. TODO: Convert to human-readable UTC time.

Fortune for naka's current commit: Blessing − 吉
---
 Makefile          | 5 ++++-
 include/project.h | 4 ++++
 src/main.c        | 3 ++-
 3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index e28ae96..912af0d 100644
--- a/Makefile
+++ b/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)
 
diff --git a/include/project.h b/include/project.h
index c8b260c..294af40 100644
--- a/include/project.h
+++ b/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 */
diff --git a/src/main.c b/src/main.c
index 91908e8..3e3b70f 100644
--- a/src/main.c
+++ b/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);
 }