buildsys: update unifdef

sync up to 1542ea42da59018860a987f34f065cd120982e8c
(2.10 + cleaner exit status handling)

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

extra/scripts/install_headers.sh

@@ -34,7 +34,7 @@ fi
 
 # Sanitize and copy uclibc headers
 (
-# We must cd, or else we'll prepend "${srcdir}" to filenames!
+# We must cd, or else we will prepend "${srcdir}" to filenames!
 cd "${srcdir}" || exit 1
 find . ! -name '.' -a ! -path '*/.*' | sed -e 's/^\.\///' -e '/^config\//d' \
 	-e '/^config$/d'
@@ -50,13 +50,12 @@ while read -r filename; do
 		# Do not install libc-XXXX.h files
 		continue
 	fi
-	# NB: unifdef exits with 1 if output is not
-	# exactly the same as input. That's ok.
 	# Do not abort the script if unifdef "fails"!
 	# NB2: careful with sed command arguments, they contain tab character
 	"$top_builddir/extra/scripts/unifdef" \
 		-B \
 		-t \
+		-x 2 \
 		-f "$top_builddir/include/generated/unifdef_config.h" \
 		-U_LIBC \
 		-U__UCLIBC_GEN_LOCALE \

extra/scripts/unifdef.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2002 - 2013 Tony Finch <dot@dotat.at>
+ * Copyright (c) 2002 - 2014 Tony Finch <dot@dotat.at>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -207,6 +207,7 @@ static bool             firstsym;		/* ditto */
 
 static int              exitmode;		/* exit status mode */
 static int              exitstat;		/* program exit status */
+static bool             altered;		/* was this file modified? */
 
 static void             addsym1(bool, bool, char *);
 static void             addsym2(bool, const char *, const char *);
@@ -415,7 +416,11 @@ processinout(const char *ifn, const char *ofn)
 			err(2, "can't rename \"%s\" to \"%s\"", ofn, backname);
 		free(backname);
 	}
-	if (replace(tempname, ofn) < 0)
+	/* leave file unmodified if unifdef made no changes */
+	if (!altered && backext == NULL) {
+		if (remove(tempname) < 0)
+			warn("can't remove \"%s\"", tempname);
+	} else if (replace(tempname, ofn) < 0)
 		err(2, "can't rename \"%s\" to \"%s\"", tempname, ofn);
 	free(tempname);
 	tempname = NULL;
@@ -637,6 +642,7 @@ keywordedit(const char *replacement)
 {
 	snprintf(keyword, tline + sizeof(tline) - keyword,
 	    "%s%s", replacement, newline);
+	altered = true;
 	print();
 }
 static void
@@ -699,7 +705,7 @@ flushline(bool keep)
 	} else {
 		if (lnblank && fputs(newline, output) == EOF)
 			closeio();
-		exitstat = 1;
+		altered = true;
 		delcount += 1;
 		blankcount = 0;
 	}
@@ -751,6 +757,7 @@ process(void)
 	zerosyms = true;
 	newline = NULL;
 	linenum = 0;
+	altered = false;
 	while (lineval != LT_EOF) {
 		lineval = parseline();
 		trans_table[ifstate[depth]][lineval]();
@@ -758,6 +765,7 @@ process(void)
 		    linenum, linetype_name[lineval],
 		    ifstate_name[ifstate[depth]], depth);
 	}
+	exitstat |= altered;
 }
 
 /*
@@ -1097,14 +1105,12 @@ skiphash(void)
 {
 	const char *cp;
 
-	if (linestate == LS_START) {
-		linenum++;
-		if (fgets(tline, MAXLINE, input) == NULL) {
-			if (ferror(input))
-				err(2, "can't read %s", filename);
-			else
-				return (NULL);
-		}
+	linenum++;
+	if (fgets(tline, MAXLINE, input) == NULL) {
+		if (ferror(input))
+			err(2, "can't read %s", filename);
+		else
+			return (NULL);
 	}
 	cp = skipcomment(tline);
 	if (linestate == LS_START && *cp == '#') {
@@ -1124,7 +1130,8 @@ skiphash(void)
 static const char *
 skipline(const char *cp)
 {
-	linestate = LS_DIRTY;
+	if (*cp != '\0')
+		linestate = LS_DIRTY;
 	while (*cp != '\0')
 		cp = skipcomment(cp + 1);
 	return (cp);

extra/scripts/unifdef.h

@@ -37,6 +37,7 @@
 /* Avoid err.h since this are non-standard BSD extensions */
 #define vwarnx(fmt, args)   ({ fprintf(stderr, "unifdef: "); vfprintf(stderr, fmt, args); fprintf(stderr, "\n"); })
 #define warnx(fmt, args...) fprintf(stderr, "unifdef: " fmt "\n", ## args)
+#define warn(fmt, args...)  warnx(fmt ": %s", ## args, strerror(errno))
 #define errx(exit_code, fmt, args...) ({ warnx(fmt, ## args); exit(exit_code); })
 #define err(exit_code, fmt, args...)  errx(exit_code, fmt ": %s", ## args, strerror(errno))
 

extra/scripts/version.h

@@ -1,2 +1,2 @@
-"@(#) $Version: unifdef-2.9.5.55501a6 $\n"
-"@(#) $Date: 2013-06-12 15:50:39 +0100 $\n"
+"@(#) $Version: unifdef-2.10.4.1542ea4 $\n"
+"@(#) $Date: 2014-01-07 22:32:21 +0000 $\n"