Hi,
I still seem to run in to trouble with compilation/linking/Makefiles basics. It would be great if someone could clear this problem I am facing.
I have written this Makefile which uses a cross-complier/linker (for arm). Now when I do a "make" the executable image is formed but it contains all undefined symbols.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
#Makefile for the user space test driver application
TESTDIR = $(shell cd ../;pwd)
CC = xscale_le-gcc
LD = xscale_le-ld
LIB := /opt/montavista/pro/devkit/arm/xscale_le/lib/gcc-lib/armv5tel-hardhat-linux/3.3.1
INCLUDE := $(TESTDIR)
CFLAGS += -Wall -I$(INCLUDE)
TARGET = user_app
SRC := uapp.c parse_opts.c
OBJS := parse_opts.o uapp.o #uapp.c uses symbols defined in parse_opts.c
all : .depend $(TARGET)
$(TARGET) : $(OBJS)
$(LD) -r -L$(LIB) -lgcc $^ -o $@
$(OBJS) : $(SRC)
$(CC) $(CFLAGS) -c $(SRC)
install:
mv -f $(TARGET) bin/
clean :
rm -f *.o *.*~ .depend $(TARGET)
depend .depend :
$(CC) $(CFLAGS) -M *.c > $@
include .depend
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++=
Now when I do a objdump, many symbols seem to be unresolved. So, obviously the linking dosent seem to be done properly.
(ps: when I do the compilation and linking in a single step, i.e., it gets linked properly)
+++++++++++++++++++++++++++++++++++++++++++++++++++
$objdump -t prog
user_app: file format elf32-little
SYMBOL TABLE:
00000000 l d .text 00000000
00000000 l d *ABS* 00000000
00000000 l d .rodata 00000000
00000000 l d *ABS* 00000000
00000000 l d .data 00000000
00000000 l d .bss 00000000
00000000 l d .comment 00000000
00000000 l d *ABS* 00000000
00000000 l d *ABS* 00000000
00000000 l d *ABS* 00000000
00000000 l df *ABS* 00000000 parse_opts.c
00000000 l df *ABS* 00000000
uapp.c
00000000 *UND* 00000000 strcpy
00000000 *UND* 00000000 ioctl
00000000 *UND* 00000000 printf
00000000 *UND* 00000000 getopt_long
00000000 g F .text 00000284 ParseOpts
000004b8 g F .text 0000001c PrintUsage
00000000 *UND* 00000000 memcpy
00000284 g F .text 00000234 GetArgs
00000000 *UND* 00000000 perror
000007a0 g F .text 000000d0 Print_DataStruct
00000000 *UND* 00000000 malloc
00000000 *UND* 00000000 optarg
00000724 g F .text 0000007c Cleanup
00000014 O *COM* 00000020 data
000004d4 g F .text 00000250 main
00000000 *UND* 00000000 exit
00000000 *UND* 00000000 atoi
00000000 *UND* 00000000 strlen
00000000 *UND* 00000000 open
00000000 *UND* 00000000 free
+++++++++++++++++++++++++++++++++++++++++++++++++++++
Can someone please give pointers as to what is the bug in this Makefile ?
rgds
Arun
--
"There are 10 people in the world - those who understand binary and those who dont !"
