make: *** No rule to make target `main.o'

here is the output from the console in Eclipse:

 **** Build of configuration Debug for project FatFstest ****

make all 
make: *** No rule to make target `main.o', needed by `FatFstest.elf'.  Stop.

I am trying to build a project using the AVR plugin for Eclipse to test the FatFs library. I first imported the FatFs code then created main.c file to implement it. After I tried building it the first time, I added the src folder of my project to my the directories list in Properties > AVR Compiler > Directories, and I still get the build error. Any help?

Here is my makefile:

################################################################################
# Automatically-generated file. Do not edit!
################################################################################

-include ../makefile.init

RM := rm -rf

# All of the sources participating in the build are defined here
-include sources.mk
-include subdir.mk
-include src/subdir.mk
-include objects.mk

ifneq ($(MAKECMDGOALS),clean)
ifneq ($(strip $(C_DEPS)),)
-include $(C_DEPS)
endif
ifneq ($(strip $(ASM_DEPS)),)
-include开发者_如何转开发 $(ASM_DEPS)
endif
ifneq ($(strip $(S_DEPS)),)
-include $(S_DEPS)
endif
ifneq ($(strip $(S_UPPER_DEPS)),)
-include $(S_UPPER_DEPS)
endif
endif

-include ../makefile.defs

# Add inputs and outputs from these tool invocations to the build variables 
LSS += \
FatFstest.lss \

SIZEDUMMY += \
sizedummy \

AVRDUDEDUMMY += \
avrdudedummy \


# All Target
all: FatFstest.elf secondary-outputs

# Tool invocations
FatFstest.elf: $(OBJS) $(USER_OBJS)
    @echo 'Building target: $@'
    @echo 'Invoking: AVR C Linker'
    avr-gcc -Wl,-Map,FatFstest.map -mmcu=atmega328p -o"FatFstest.elf" $(OBJS) $(USER_OBJS) $(LIBS)
    @echo 'Finished building target: $@'
    @echo ' '

FatFstest.lss: FatFstest.elf
    @echo 'Invoking: AVR Create Extended Listing'
    -avr-objdump -h -S FatFstest.elf  >"FatFstest.lss"
    @echo 'Finished building: $@'
    @echo ' '

sizedummy: FatFstest.elf
    @echo 'Invoking: Print Size'
    -avr-size --format=avr --mcu=atmega328p FatFstest.elf
    @echo 'Finished building: $@'
    @echo ' '

avrdudedummy: FatFstest.elf
    @echo 'Invoking: AVRDude'
    /usr/local/CrossPack-AVR-20100115/bin/avrdude -pm328p -Uflash:w:FatFstest.hex:a
    @echo 'Finished building: $@'
    @echo ' '

# Other Targets
clean:
    -$(RM) $(OBJS)$(C_DEPS)$(ASM_DEPS)$(ELFS)$(LSS)$(AVRDUDEDUMMY)$(S_DEPS)$(SIZEDUMMY)$(S_UPPER_DEPS) FatFstest.elf
    -@echo ' '

secondary-outputs: $(LSS) $(SIZEDUMMY) $(AVRDUDEDUMMY)

.PHONY: all clean dependents
.SECONDARY:

-include ../makefile.targets

main.c

#include <diskio.h>
#include <ff.h>
#include <stdio.h>
 int main(void)
 {
   printf("hello world\n");
   return 0;
 }

subdir.mk

################################################################################
# Automatically-generated file. Do not edit!
################################################################################

# Add inputs and outputs from these tool invocations to the build variables 
C_SRCS += \
../src/diskio.c \
../src/ff.c \
../src/main.c 

OBJS += \
./src/diskio.o \
./src/ff.o \
./src/main.o 

C_DEPS += \
./src/diskio.d \
./src/ff.d \
./src/main.d 


# Each subdirectory must supply rules for building sources it contributes
src/%.o: ../src/%.c
    @echo 'Building file: $<'
    @echo 'Invoking: AVR Compiler'
    avr-gcc -I"/Users/nathannewcomb/Documents/Puzzles/FatFstest/src" -Wall -g2 -gstabs -O0 -fpack-struct -fshort-enums -std=gnu99 -funsigned-char -funsigned-bitfields -mmcu=atmega328p -DF_CPU=1000000UL -MMD -MP -MF"$(@:%.o=%.d)" -MT"$(@:%.o=%.d)" -c -o"$@" "$<"
    @echo 'Finished building: $<'
    @echo ' '

objects.mk

################################################################################
# Automatically-generated file. Do not edit!
################################################################################

USER_OBJS :=

LIBS :=

sources.mk

################################################################################
# Automatically-generated file. Do not edit!
################################################################################

O_SRCS := 
C_SRCS := 
S_UPPER_SRCS := 
S_SRCS := 
OBJ_SRCS := 
ASM_SRCS := 
OBJS := 
C_DEPS := 
ASM_DEPS := 
ELFS := 
LSS := 
AVRDUDEDUMMY := 
S_DEPS := 
SIZEDUMMY := 
S_UPPER_DEPS := 

# Every subdirectory with source files must be described here
SUBDIRS := \
src \

It happened to me too, simply moving main.cpp in an another folder.

I try to clean out the project, but the problem persist, so I have deleted Debug folder, re-compile and it works!

Don't put the main.c in a directory, put it at the top of its project

I added the src folder of my project to my the directories list in Properties > AVR Compiler > Directories

Remove this /Users/nathannewcomb/Documents/Puzzles/FatFstest/src folder and try to compile again.

In the subdir.mk file, the line :

avr-gcc -I"/Users/nathannewcomb/Documents/Puzzles/FatFstest/src" -Wall -g2 -gstabs -O0 -fpack-struct -fshort-enums -std=gnu99 -funsigned-char -funsigned-bitfields -mmcu=atmega328p -DF_CPU=1000000UL -MMD -MP -MF"$(@:%.o=%.d)" -MT"$(@:%.o=%.d)" -c -o"$@" "$<"

should be become :

avr-gcc -Wall -g2 -gstabs -O0 -fpack-struct -fshort-enums -std=gnu99 -funsigned-char -funsigned-bitfields -mmcu=atmega328p -DF_CPU=1000000UL -MMD -MP -MF"$(@:%.o=%.d)" -MT"$(@:%.o=%.d)" -c -o"$@" "$<"

This src folder is already added in source.mk file :

# Every subdirectory with source files must be described here
SUBDIRS := \
src \

quoting eclipse - http://help.eclipse.org/juno/index.jsp?topic=%2Forg.eclipse.cdt.doc.user%2Fconcepts%2Fcdt_c_makefile.htm

Q2. My Console view says No rule to make target 'X'.

make -k clean all make: * No rule to make target 'clean'. make: * No rule to make target 'all'. By default, the make program looks for a file most commonly called "Makefile" or "makefile". If it cannot find such a file in the working directory, or if that file is empty or the file does not contain rules for the command line goals ("clean" and "all" in this case), it will normally fail with an error message similar to those shown.

If you already have a valid Makefile, you may need to change the working directory of your build. The default working directory for the build command is the project's root directory. You can change this by specifying an alternate Build Directory in the Make Project properties. Or, if your Makefile is named something else (eg. buildFile.mk), you can specify the name by setting the default Build command to make -f buildFile.mk.

If you do not have a valid Makefile, create a new file named Makefile in the root directory. You can then add the contents of the sample Makefile (above), and modify it as appropriate.