crt0.o should live in the target directory now

build.bat

@@ -1,6 +1,7 @@
 
 @rem Build the crt0 file before we begin
-arm-none-eabi-as crt0.s -o crt0.o
+@if not exist ".\target" mkdir target
+arm-none-eabi-as crt0.s -o target/crt0.o
 
 @rem Build all examples, both debug and release
 cargo xbuild --examples --target thumbv4-none-agb.json

linker.ld

@@ -8,7 +8,7 @@ MEMORY {
 
 SECTIONS {
     .text : {
-        KEEP(crt0.o(.text));
+        KEEP(target/crt0.o(.text));
         *(.text .text.*);
         . = ALIGN(4);
     } >rom = 0xff