Make resulting binary smaller.

Makefile

@@ -1,12 +1,12 @@
 SRCS = boot.c
-LDFLAGS = -melf_i386 -nostdlib --oformat binary -T linker.ld
-CFLAGS = -fno-pie -Wall -std=c2x -m16 -nostdlib -Os -nostartfiles
+LDFLAGS = -flto -T linker.ld -nostdlib
+CFLAGS = -flto -ffreestanding -fno-builtin -fno-pie -Wall -std=c2x -m16 -nostdlib -Os -nostartfiles -r
 
 %.o: %.c
-	$(CC) $(CFLAGS) $^ -c -o $@
+	$(CC) $^ -o $@ $(CFLAGS)
 
 all: $(SRCS:.c=.o)
-	$(LD) $(LDFLAGS) -o bin $^
+	$(CC) $(LDFLAGS) -o bin $^
 
 clean:
 	$(RM) $(SRCS:.c=.o) bin

boot.c

@@ -1,5 +1,5 @@
-void putchar(char);
-void write(char*);
+inline void putchar(char);
+inline void write(char*);
 
 void _start(void) {
 	write("Hello World!\r\n\0");
@@ -7,12 +7,12 @@ void _start(void) {
 		;
 }
 
-void write(char *out) {
+inline void write(char *out) {
 	for (char *i = out; *i != 0; i++)
 		putchar(*i);
 }
 
-void putchar(char out) {
+inline void putchar(char out) {
 __asm__ volatile (
 	"movb $0x0e, %%ah;"
 	"movb %0, %%al;"

linker.ld

@@ -1,9 +1,10 @@
 ENTRY (_start)
 OUTPUT_FORMAT (binary)
+OUTPUT_ARCH(i386)
 SECTIONS
 {
     . = 0x7c00;
-    .text : { boot.o(.text)
+    .text : {
               *(.text)
             }
     .rodata : { *(.rodata)