dtc: Optimise by default, fix warnings thus uncovered

This patch turns on optimisation in the Makefile by default.  With the
optimizer on, some uninitialized variable warnings (one real, two
bogus) are now generated.  This patch also squashes those again.

Makefile

@@ -45,7 +45,7 @@ endef
 
 
 CPPFLAGS = -I libfdt
-CFLAGS = -Wall -g
+CFLAGS = -Wall -g -Os
 LDFLAGS = -Llibfdt
 
 BISON = bison

dtc.c

@@ -71,7 +71,7 @@ void fill_fullpaths(struct node *tree, char *prefix)
 		fill_fullpaths(child, tree->fullpath);
 }
 
-static void usage(void)
+static void  __attribute__ ((noreturn)) usage(void)
 {
 	fprintf(stderr, "Usage:\n");
 	fprintf(stderr, "\tdtc [options] <input file>\n");

dtc.h

@@ -43,7 +43,7 @@ extern int quiet;		/* Level of quietness */
 extern int reservenum;		/* Number of memory reservation slots */
 extern int minsize;		/* Minimum blob size */
 
-static inline void die(char * str, ...)
+static inline void __attribute__((noreturn)) die(char * str, ...)
 {
 	va_list ap;
 

flattree.c

@@ -909,6 +909,7 @@ struct boot_info *dt_from_blob(FILE *f)
 		fprintf(stderr, "\tboot_cpuid_phys:\t0x%x\n",
 			be32_to_cpu(bph->boot_cpuid_phys));
 
+	size_str = -1;
 	if (version >= 3) {
 		size_str = be32_to_cpu(bph->size_dt_strings);
 		fprintf(stderr, "\tsize_dt_strings:\t%d\n", size_str);
@@ -932,10 +933,10 @@ struct boot_info *dt_from_blob(FILE *f)
 	inbuf_init(&memresvbuf,
 		   blob + off_mem_rsvmap, blob + totalsize);
 	inbuf_init(&dtbuf, blob + off_dt, blob + totalsize);
-	inbuf_init(&strbuf, blob + off_str, blob + totalsize);
-
-	if (version >= 3)
-		strbuf.limit = strbuf.base + size_str;
+	if (size_str >= 0)
+		inbuf_init(&strbuf, blob + off_str, blob + off_str + size_str);
+	else
+		inbuf_init(&strbuf, blob + off_str, blob + totalsize);
 
 	reservelist = flat_read_mem_reserve(&memresvbuf);
 

tests/truncated_property.c

@@ -33,7 +33,6 @@ int main(int argc, char *argv[])
 {
 	void *fdt = &_truncated_property;
 	const void *prop;
-	int err;
 	int len;
 
 	test_init(argc, argv);
@@ -43,7 +42,7 @@ int main(int argc, char *argv[])
 		FAIL("fdt_getprop() succeeded on truncated property");
 	if (len != -FDT_ERR_BADSTRUCTURE)
 		FAIL("fdt_getprop() failed with \"%s\" instead of \"%s\"",
-		     fdt_strerror(err), fdt_strerror(-FDT_ERR_BADSTRUCTURE));
+		     fdt_strerror(len), fdt_strerror(-FDT_ERR_BADSTRUCTURE));
 
 	PASS();
 }