ignoring file lib.a, file was built for archive which is not the architecture being linked (x86_64)

Question

I'm trying to code a printf clone. I've built a library file called "libftprintf.a" but when I try to use it, I get the following error, on Mac OSX 10.8.5:

ld: warning: ignoring file ./libftprintf.a, file was built for archive which is not the architecture being linked (x86_64): ./libftprintf.a

Strangely this works fine (but I need only one lib called libftprintf, so this is not acceptable):

gcc -Wall -Wextra -Werror -I libft/includes/ -o ft_printf_test.bin -L libft -lft -L. -lftprintf ft_printf_test.c

I suspect I have misused the ar command to link both libs together. But I don't se my mistake yet.

What could be the cause of that?

Everything seems to compile just fine until I try to use the libftprintf.a file with the make test command. I've searched for a solution on Google, but most answers relate to XCode only. According to lipo -info, the files are x86_64.

My GCC version:

$> gcc --version
Configured with: --prefix=/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 5.0 (clang-500.2.79) (based on LLVM 3.3svn)
Target: x86_64-apple-darwin12.5.0
Thread model: posix

Below is the full output of my makefile, for reference.

$> make re
make -C libft clean
rm -f src/ft_arrdel.o src/ft_atoi.o src/ft_bzero.o src/ft_isalnum.o src/ft_isalpha.o src/ft_isascii.o src/ft_isdigit.o src/ft_islower.o src/ft_isprint.o src/ft_isupper.o src/ft_itoa.o src/ft_lstadd.o src/ft_lstdel.o src/ft_lstdelone.o src/ft_lstiter.o src/ft_lstmap.o src/ft_lstnew.o src/ft_lstpush.o src/ft_malloc.o src/ft_memalloc.o src/ft_memccpy.o src/ft_memchr.o src/ft_memcmp.o src/ft_memcpy.o src/ft_memdel.o src/ft_memmove.o src/ft_memset.o src/ft_putchar.o src/ft_putchar_fd.o src/ft_putendl.o src/ft_putendl_fd.o src/ft_putnbr.o src/ft_putnbr_fd.o src/ft_putstr.o src/ft_putstr_fd.o src/ft_strcat.o src/ft_strchr.o src/ft_strclr.o src/ft_strcmp.o src/ft_strcpy.o src/ft_strdel.o src/ft_strdup.o src/ft_strequ.o src/ft_striter.o src/ft_striteri.o src/ft_strjoin.o src/ft_strlcat.o src/ft_strlen.o src/ft_strmap.o src/ft_strmapi.o src/ft_strncat.o src/ft_strncmp.o src/ft_strncpy.o src/ft_strnequ.o src/ft_strnew.o src/ft_strnstr.o src/ft_strrchr.o src/ft_strrev.o src/ft_strsplit.o src/ft_strstr.o src/ft_strsub.o src/ft_strtrim.o src/ft_tolower.o src/ft_toupper.o src/get_next_line.o
rm -f ft_printf.o
make -C libft fclean
rm -f src/ft_arrdel.o src/ft_atoi.o src/ft_bzero.o src/ft_isalnum.o src/ft_isalpha.o src/ft_isascii.o src/ft_isdigit.o src/ft_islower.o src/ft_isprint.o src/ft_isupper.o src/ft_itoa.o src/ft_lstadd.o src/ft_lstdel.o src/ft_lstdelone.o src/ft_lstiter.o src/ft_lstmap.o src/ft_lstnew.o src/ft_lstpush.o src/ft_malloc.o src/ft_memalloc.o src/ft_memccpy.o src/ft_memchr.o src/ft_memcmp.o src/ft_memcpy.o src/ft_memdel.o src/ft_memmove.o src/ft_memset.o src/ft_putchar.o src/ft_putchar_fd.o src/ft_putendl.o src/ft_putendl_fd.o src/ft_putnbr.o src/ft_putnbr_fd.o src/ft_putstr.o src/ft_putstr_fd.o src/ft_strcat.o src/ft_strchr.o src/ft_strclr.o src/ft_strcmp.o src/ft_strcpy.o src/ft_strdel.o src/ft_strdup.o src/ft_strequ.o src/ft_striter.o src/ft_striteri.o src/ft_strjoin.o src/ft_strlcat.o src/ft_strlen.o src/ft_strmap.o src/ft_strmapi.o src/ft_strncat.o src/ft_strncmp.o src/ft_strncpy.o src/ft_strnequ.o src/ft_strnew.o src/ft_strnstr.o src/ft_strrchr.o src/ft_strrev.o src/ft_strsplit.o src/ft_strstr.o src/ft_strsub.o src/ft_strtrim.o src/ft_tolower.o src/ft_toupper.o src/get_next_line.o
rm -f libft.a
rm -f libftprintf.a
rm -Rf ft_printf_test.bin*
gcc -Wall -Wextra -Werror -I libft/includes/ -c ft_printf.c -o ft_printf.o
make -C libft
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_arrdel.c -o src/ft_arrdel.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_atoi.c -o src/ft_atoi.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_bzero.c -o src/ft_bzero.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_isalnum.c -o src/ft_isalnum.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_isalpha.c -o src/ft_isalpha.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_isascii.c -o src/ft_isascii.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_isdigit.c -o src/ft_isdigit.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_islower.c -o src/ft_islower.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_isprint.c -o src/ft_isprint.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_isupper.c -o src/ft_isupper.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_itoa.c -o src/ft_itoa.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_lstadd.c -o src/ft_lstadd.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_lstdel.c -o src/ft_lstdel.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_lstdelone.c -o src/ft_lstdelone.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_lstiter.c -o src/ft_lstiter.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_lstmap.c -o src/ft_lstmap.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_lstnew.c -o src/ft_lstnew.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_lstpush.c -o src/ft_lstpush.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_malloc.c -o src/ft_malloc.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_memalloc.c -o src/ft_memalloc.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_memccpy.c -o src/ft_memccpy.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_memchr.c -o src/ft_memchr.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_memcmp.c -o src/ft_memcmp.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_memcpy.c -o src/ft_memcpy.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_memdel.c -o src/ft_memdel.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_memmove.c -o src/ft_memmove.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_memset.c -o src/ft_memset.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_putchar.c -o src/ft_putchar.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_putchar_fd.c -o src/ft_putchar_fd.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_putendl.c -o src/ft_putendl.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_putendl_fd.c -o src/ft_putendl_fd.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_putnbr.c -o src/ft_putnbr.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_putnbr_fd.c -o src/ft_putnbr_fd.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_putstr.c -o src/ft_putstr.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_putstr_fd.c -o src/ft_putstr_fd.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_strcat.c -o src/ft_strcat.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_strchr.c -o src/ft_strchr.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_strclr.c -o src/ft_strclr.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_strcmp.c -o src/ft_strcmp.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_strcpy.c -o src/ft_strcpy.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_strdel.c -o src/ft_strdel.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_strdup.c -o src/ft_strdup.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_strequ.c -o src/ft_strequ.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_striter.c -o src/ft_striter.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_striteri.c -o src/ft_striteri.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_strjoin.c -o src/ft_strjoin.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_strlcat.c -o src/ft_strlcat.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_strlen.c -o src/ft_strlen.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_strmap.c -o src/ft_strmap.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_strmapi.c -o src/ft_strmapi.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_strncat.c -o src/ft_strncat.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_strncmp.c -o src/ft_strncmp.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_strncpy.c -o src/ft_strncpy.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_strnequ.c -o src/ft_strnequ.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_strnew.c -o src/ft_strnew.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_strnstr.c -o src/ft_strnstr.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_strrchr.c -o src/ft_strrchr.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_strrev.c -o src/ft_strrev.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_strsplit.c -o src/ft_strsplit.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_strstr.c -o src/ft_strstr.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_strsub.c -o src/ft_strsub.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_strtrim.c -o src/ft_strtrim.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_tolower.c -o src/ft_tolower.o
gcc -g -Wall -Wextra -Werror -I includes -c src/ft_toupper.c -o src/ft_toupper.o
gcc -g -Wall -Wextra -Werror -I includes -c src/get_next_line.c -o src/get_next_line.o
ar -rsv libft.a src/ft_arrdel.o src/ft_atoi.o src/ft_bzero.o src/ft_isalnum.o src/ft_isalpha.o src/ft_isascii.o src/ft_isdigit.o src/ft_islower.o src/ft_isprint.o src/ft_isupper.o src/ft_itoa.o src/ft_lstadd.o src/ft_lstdel.o src/ft_lstdelone.o src/ft_lstiter.o src/ft_lstmap.o src/ft_lstnew.o src/ft_lstpush.o src/ft_malloc.o src/ft_memalloc.o src/ft_memccpy.o src/ft_memchr.o src/ft_memcmp.o src/ft_memcpy.o src/ft_memdel.o src/ft_memmove.o src/ft_memset.o src/ft_putchar.o src/ft_putchar_fd.o src/ft_putendl.o src/ft_putendl_fd.o src/ft_putnbr.o src/ft_putnbr_fd.o src/ft_putstr.o src/ft_putstr_fd.o src/ft_strcat.o src/ft_strchr.o src/ft_strclr.o src/ft_strcmp.o src/ft_strcpy.o src/ft_strdel.o src/ft_strdup.o src/ft_strequ.o src/ft_striter.o src/ft_striteri.o src/ft_strjoin.o src/ft_strlcat.o src/ft_strlen.o src/ft_strmap.o src/ft_strmapi.o src/ft_strncat.o src/ft_strncmp.o src/ft_strncpy.o src/ft_strnequ.o src/ft_strnew.o src/ft_strnstr.o src/ft_strrchr.o src/ft_strrev.o src/ft_strsplit.o src/ft_strstr.o src/ft_strsub.o src/ft_strtrim.o src/ft_tolower.o src/ft_toupper.o src/get_next_line.o
ar: creating archive libft.a
a - src/ft_arrdel.o
a - src/ft_atoi.o
a - src/ft_bzero.o
a - src/ft_isalnum.o
a - src/ft_isalpha.o
a - src/ft_isascii.o
a - src/ft_isdigit.o
a - src/ft_islower.o
a - src/ft_isprint.o
a - src/ft_isupper.o
a - src/ft_itoa.o
a - src/ft_lstadd.o
a - src/ft_lstdel.o
a - src/ft_lstdelone.o
a - src/ft_lstiter.o
a - src/ft_lstmap.o
a - src/ft_lstnew.o
a - src/ft_lstpush.o
a - src/ft_malloc.o
a - src/ft_memalloc.o
a - src/ft_memccpy.o
a - src/ft_memchr.o
a - src/ft_memcmp.o
a - src/ft_memcpy.o
a - src/ft_memdel.o
a - src/ft_memmove.o
a - src/ft_memset.o
a - src/ft_putchar.o
a - src/ft_putchar_fd.o
a - src/ft_putendl.o
a - src/ft_putendl_fd.o
a - src/ft_putnbr.o
a - src/ft_putnbr_fd.o
a - src/ft_putstr.o
a - src/ft_putstr_fd.o
a - src/ft_strcat.o
a - src/ft_strchr.o
a - src/ft_strclr.o
a - src/ft_strcmp.o
a - src/ft_strcpy.o
a - src/ft_strdel.o
a - src/ft_strdup.o
a - src/ft_strequ.o
a - src/ft_striter.o
a - src/ft_striteri.o
a - src/ft_strjoin.o
a - src/ft_strlcat.o
a - src/ft_strlen.o
a - src/ft_strmap.o
a - src/ft_strmapi.o
a - src/ft_strncat.o
a - src/ft_strncmp.o
a - src/ft_strncpy.o
a - src/ft_strnequ.o
a - src/ft_strnew.o
a - src/ft_strnstr.o
a - src/ft_strrchr.o
a - src/ft_strrev.o
a - src/ft_strsplit.o
a - src/ft_strstr.o
a - src/ft_strsub.o
a - src/ft_strtrim.o
a - src/ft_tolower.o
a - src/ft_toupper.o
a - src/get_next_line.o
ar -rsv libftprintf.a libft/libft.a ft_printf.o
ar: creating archive libftprintf.a
a - libft/libft.a
a - ft_printf.o
ranlib libftprintf.a
$> make test
gcc -Wall -Wextra -Werror -I libft/includes/ -L. -lftprintf -o ft_printf_test.bin ft_printf_test.c
ld: warning: ignoring file ./libftprintf.a, file was built for archive which is not the architecture being linked (x86_64): ./libftprintf.a
Undefined symbols for architecture x86_64:
  "_ft_printf_string", referenced from:
      _test_printf_percent in ft_printf_test-jTXeph.o
  "_ft_strcmp", referenced from:
      _test_printf_percent in ft_printf_test-jTXeph.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [test] Error 1
[ ckleines ~/Projects/2013-2014/Algo-1/printf ] $> lipo -info libft/libft.a
input file libft/libft.a is not a fat file
Non-fat file: libft/libft.a is architecture: x86_64
[ ckleines ~/Projects/2013-2014/Algo-1/printf ] $> lipo -info libftprintf.a
input file libftprintf.a is not a fat file
Non-fat file: libftprintf.a is architecture: x86_64
[ ckleines ~/Projects/2013-2014/Algo-1/printf ] $> lipo -info ft_printf.o
Non-fat file: ft_printf.o is architecture: x86_64

Answer 1

Use libtool -static -o instead of ar.

Static library link issue with Mac OS X: symbol(s) not found for architecture x86_64

Answer 2

If you have fat architecture object files you must make sure that you pass the s flag to ar. Without it the linker will refuse to take archive files that contain fat architecture .o files. For example:

$ ar rcs libprintf.a *.o

You should then see a warning about creating a 'fat archive'. Don't worry about this, it means that ar won't be able to update the archive file, but the linker will be able to use it to link properly.

Answer 3

I've found a slightly dirty but working solution for now. I extract the libft/libft.a archive in a temporary directory. Link the new library with the extracted .o files and then remove the temporary directory.

$(NAME): $(OBJ) $(HEADER)
    make -C libft
    mkdir libft_o && cd libft_o && ar -x ../libft/libft.a && cd ..
    $(AR) $(NAME) libft_o/*.o $(OBJ)
    rm -Rf libft_o
    ranlib $(NAME)

The drawback being that if an object file from libft at some point has the same name than one from the printf files, it will overwrite things. But that's not likely to happen.