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Re: ARM dynamic linking
- From: Daniel Jacobowitz <drow at false dot org>
- To: johnmc at sidsa dot es
- Cc: libc-alpha at sources dot redhat dot com
- Date: Fri, 30 Dec 2005 16:43:56 -0500
- Subject: Re: ARM dynamic linking
- References: <1681.195.53.86.158.1135847374.squirrel@webmail>
On Thu, Dec 29, 2005 at 10:09:34AM +0100, johnmc@sidsa.es wrote:
> arm-elf-ld -shared dyn.o -o dyn.ld
> arm-elf-ld -r main.o other.o system.o static.o -o main.ld
> arm-elf-ld main.ld dyn.ld -o out.a
Do not do this. You should never use "ld" directly to link, if you
don't already know a great deal about the way GCC invokes ld; all the
options, libraries, et cetera it passes are important!
> arm-elf-gcc -c -nostdlib calc_mean.c -o calc_mean.o
> arm-elf-ar rcs libmean.a calc_mean.o
>
> arm-elf-gcc -c -nostdlib -fPIC calc_mean.c -o calc_mean_dyn.o
> arm-elf-gcc -shared -nostdlib --verbose -Wl,-soname,libmean.so.1 -o
> libmean.so.1.0.1 calc_mean_dyn.o
>
> arm-elf-gcc -static -nostdlib --verbose main.c -L. -lmean -o
> statically_linked
> arm-elf-gcc main.c -nostdlib --verbose -o dynamically_linked -L. -lmean
Don't use -nostdlib when linking and expect the result to work without
a lot more handholding (startup files, et cetera - especially important
for dynamic linking).
-lmean will search first for "libmean.so" and then for "libmean.a". If
you creat libmean.so.1.0.1, you need to create a libmean.so ->
libmean.so.1.0.1 symlink, also. -Wl,--verbose would show you what the
linker searched for.
--
Daniel Jacobowitz
CodeSourcery, LLC