1 - HelloWorld

cfig

A 运行在PC上的代码：
*.c
/* file: hello.c */
#include stdio.h>
int main(void)
{
    printf("Hello, World!\n");
    return 0;
}
makefile
#--------------Starting---------------
CC=gcc
EXEC=hello
OBJS=hello.o
CFLAGS+=
LDFLAGS+=
$(EXEC):$(OBJS)
    $(CC) $(LDFLAGS) -o $@ $(OBJS)
clean: -rm -f *.o $(EXEC)
B.运行在ARM下的代码
/* file: hello.c */
#include stdio.h>
int main(void)
{
    printf("Hello, World!\n");
    return 0;
}
makefile
#--------------Starting---------------
prefix=/opt/host/armv4l/bin/armv4l-unknown-linux-
CC=$(prefix)gcc
EXEC=hello
OBJS=hello.o
CFLAGS+= \
    -I/opt/host/armv4l/armv4l-unknown-linux/include \
    -Wstrict-prototypes \
    -Wno-trigraphs \
    -os \
    -fno-strict-aliasing \
    -fno-common \
    -pipe \
    -mapcs-32
LDFLAGS+= -elf2flt -static
$(EXEC):$(OBJS)
    $(CC) $(LDFLAGS) -o $@ $(OBJS)
#Cleaning....
.PHONY:clean
clean:
    -rm -f *.o $(EXEC)
#-rm: ignore errors


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