Getting "collect2: error: ld returned 1 exit status" in C -


this makefile compiler. 

cc = arm-none-eabi-gcc = arm-none-eabi-as ld = arm-none-eabi-ld od = arm-none-eabi-objdump  cflags = -g -c -o1 -mcpu=cortex-m0 -mthumb aflags = -g -c -mcpu=cortex-m0 -mthumb ldflags = -g -mcpu=cortex-m0 -mthumb --specs=rdimon.specs -lc -lrdimon odflags = -d  all: hw1.elf  test: hw1.elf         @ echo "...copying"         qemu-system-arm  -machine versatilepb -cpu cortex-m3 -nographic -monitor null -serial null -semihosting -k\ ernel hw1.elf  hw1.elf: test.o t1.o         $(cc) $(ldflags) test.o t1.o -o hw1.elf  test.o: test.c t1.o         @ echo ".compiling"         $(cc) $(cflags) test.c t1.o -o test.o  t1.o: t1.s         @ echo ".assembling"         $(as) $(aflags) t1.s -o t1.o  clean:         rm -rf t1.o test.o hw1.elf

when make all, get

.assembling arm-none-eabi-as -g -c -mcpu=cortex-m0 -mthumb t1.s -o t1.o .compiling arm-none-eabi-gcc -g -c -o1 -mcpu=cortex-m0 -mthumb test.c t1.o -o test.o arm-none-eabi-gcc: warning: t1.o: linker input file unused because linking not done arm-none-eabi-ld -g -mcpu=cortex-m0 -mthumb --specs=rdimon.specs -lc -lrdimon test.o -o hw1.elf arm-none-eabi-ld: unrecognised emulation mode: thumb supported emulations: armelf make: *** [hw1.elf] error 1

i have looked @ numberous collect2 errors on stackoverflow , find there function either not defined or mislabeled.

i have entered directory in ~/.bashrc file call arm-none-eabi library functions. know error has nothing t1.s and/or test.c files , solely improper notation dealing makefile, i'm lost i'm doing wrong. know it's test.o.

i provide test.c , t1.s in case there wrong them.

test.c

include <stdio.h>  extern int inc(int);  #define red_count 5 #define yellow_count 2 #define green_count 5  enum light_states {red, yellow, green}; static int state = red;  void stop_light () {   static int state_counter = 0;    switch (state) {   case red:     printf("red\n");     if (++state_counter >= red_count) {       state_counter = 0;       state = green;     }     break;    case green:     printf("green\n");     if (++state_counter >= green_count) {       state_counter = 0;       state = yellow;     }     break;    case yellow:     printf("yellow\n");     if (++state_counter >= yellow_count) {       state_counter = 0;       state = red;     }     break;    default:     state = red;     state_counter = 0;     break;   } }  main(){   int i;    while (i < 36) {     stop_light();     = inc(i);   } }

t1.s

    .text     .syntax unified     .thumb     .global inc     .type   inc, %function inc:     adds    r0,r0,#1     bx  lr

edit 1: updated missing '-c' , getting new error regarding ld.

edit 2: updated ld error. fixed , answers helpful!


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