no more crash on day3

Makefile

@@ -2,8 +2,8 @@ FILES = $(wildcard ./*)
 SRCS  = $(filter %.c,$(FILES))
 BINS  = $(SRCS:%.c=%.elf)
 
-CFLAGS = -Wall -Werror -pedantic -D_GNU_SOURCE -std=gnu2y -O3 -g -Wno-unused\
-	     -nostartfiles -static -Ttext=C475000
+CFLAGS = -Wall -Werror -pedantic -Wno-unused -D_GNU_SOURCE -std=gnu2y\
+		 -O3 -g -Ttext=C475000 -static -nostartfiles -fno-stack-protector -march=native
 
 all: $(BINS)
 

day3.c

@@ -49,20 +49,17 @@ unsigned long do_part2(size_t file_len, unsigned char file[file_len]) {
     unsigned char *s = file;
 
     do {
-        // for some reason this crashes
-        // but works fine under blink so.
-        // whatever
         unsigned char n[12] = { };
-        unsigned char *np[12] = { };
+        unsigned char *np = NULL;
         for (int i = 0; i < 12; i++) {
             do {
                 if (s[0] > n[i]) {
                     n[i] = s[0];
-                    np[i] = s;
+                    np = s;
                 }
                 s++;
             } while (s[11-i] != '\n');
-            s = np[i]+1;
+            s = np+1;
         }
         unsigned long v = 0;
         for (int i = 0; i < 12; i++) {