Added feature flags instead of raw -D compiler flags.

Fortune for sink's current commit: Blessing − 吉

comp_features.h

@@ -0,0 +1,73 @@
+#ifndef _SINK_FEATURES_H
+#define _SINK_FEATURES_H
+
+// REPLACE_STDERR
+#ifdef FEATURE_REPLACE_STDERR
+#define _FEATURE_REPLACE_STDERR 1
+#else
+#define _FEATURE_REPLACE_STDERR 0
+#endif
+
+// NO_SEARCH_PATH
+#ifdef FEATURE_NO_SEARCH_PATH
+#define _FEATURE_NO_SEARCH_PATH 1
+#else
+#define _FEATURE_NO_SEARCH_PATH 0
+#endif
+
+// NO_ENV
+#ifdef FEATURE_NO_ENV
+#define _FEATURE_NO_ENV 1
+#else
+#define _FEATURE_NO_ENV 0
+#endif
+
+// DEBUG_IGNORE_SPLASH
+#ifdef FEATURE_DEBUG_IGNORE_SPLASH
+#define _FEATURE_DEBUG_IGNORE_SPLASH 1
+#else
+#define _FEATURE_DEBUG_IGNORE_SPLASH 0
+#endif
+
+// Modes
+
+#ifdef DEBUG
+#define _FEATURE_MODE_DEBUG 1
+#else
+#define _FEATURE_MODE_DEBUG 0
+#endif
+
+#ifdef RELEASE
+#define _FEATURE_MODE_RELEASE 1
+#else
+#define _FEATURE_MODE_RELEASE 0
+#endif
+
+#define _FEATURE_NAME_(name) _FEATURE_ ## name
+
+#define FEATURE_HAS_FLAG(name) (_FEATURE_NAME_(name) == 1)
+#define FEATURE_GET_FLAG(name) (FEATURE_HAS_FLAG(name) ? CF_ ## name : 0)
+
+enum compiled_features {
+	CF_REPLACE_STDERR	= 1 << 0,
+	CF_NO_SEARCH_PATH	= 1 << 1,
+	CF_NO_ENV		= 1 << 2,
+	CF_DEBUG_IGNORE_SPLASH	= 1 << 3,
+
+	CF_MODE_DEBUG		= 1 << 4,
+	CF_MODE_RELEASE		= 1 << 5,
+	CF_MODES		= CF_MODE_DEBUG | CF_MODE_RELEASE
+};
+
+#define FEATURE_FLAGS ((enum compiled_features) \
+				( FEATURE_GET_FLAG(REPLACE_STDERR) \
+				| FEATURE_GET_FLAG(NO_SEARCH_PATH) \
+				| FEATURE_GET_FLAG(NO_ENV) \
+				| FEATURE_GET_FLAG(DEBUG_IGNORE_SPLASH) \
+				| FEATURE_GET_FLAG(MODE_DEBUG) \
+				| FEATURE_GET_FLAG(MODE_RELEASE) \
+			))
+
+#define FEATURE_STRING(flags, name) ((((flags) & FEATURE_GET_FLAG(name)) != 0) ? "+" # name : "-" # name )
+
+#endif /* _SINK_FEATURES_H */

sink.c

@@ -6,6 +6,10 @@
 #include <limits.h>
 #include <errno.h>
 
+#include "comp_features.h"
+
+static const enum compiled_features compiled_features = FEATURE_FLAGS;
+
 #define r_stdin 0
 #define r_stdout 1
 #define r_stderr 2
@@ -149,15 +153,41 @@ static inline size_t count_list(const void*const* p)
 	while(*p++) n+=1;
 	return n;
 }
+static void print_compiled_features()
+{
+#define _X "\t%s\n"
+#define X(name) fprintf(stderr, _X, FEATURE_STRING(FEATURE_FLAGS, name))
+	X(REPLACE_STDERR);
+	X(NO_SEARCH_PATH);
+	X(NO_ENV);
+	X(DEBUG_IGNORE_SPLASH);
+	fprintf(stderr, "Build mode: \n\t"
+#if defined(DEBUG) && defined(RELEASE)
+			"release (+debug paths)"
+#elif defined(DEBUG)
+			"debug"
+#elif degined(RELEASE)
+			"release"
+#else
+			"unknown"
+#endif
+			"\n");
+
+#undef X
+#undef _X
+}
 static void print_debug_info(int argc, char* const* argv, char* const* envp)
 {
 	fprintf(stderr, "[DEBUG BUILD]\n");
-#ifndef DEBUG_IGNORE_SPLASH
+#if ! FEATURE_HAS_FLAG(DEBUG_IGNORE_SPLASH)
 	fprintf(stderr,  _PROJECT " v" _VERSION ": " _DESCRIPTION "\n");
 	fprintf(stderr, " :: written by " _AUTHOR " with <3 (License " _LICENSE ")\n---\n");
 #endif
+	fprintf(stderr, "> features:\n");
+	print_compiled_features();
+
 	fprintf(stderr, "> program: %s (path lookup: "
-#ifdef NO_SEARCH_PATH
+#if FEATURE_HAS_FLAG(NO_SEARCH_PATH)
 							"false"
 #else
 							"true"