On Mär 09 2023, Sergey Bugaev wrote:
> x86_64-gnu-gcc -nostdlib -nostartfiles -r -o elf/librtld.map.o
> elf/librtld.mapT.o '-Wl,-(' elf/dl-allobjs.os libc_pic.a
> mach/libmachuser_pic.a hurd/libhurduser_pic.a -lgcc '-Wl,-)'
> -Wl,-Map,elf/librtld.mapT
> x86_64-gnu/bin/ld: libc_pic.a(_exit.os): in function `__GI__exit':
> posix/../sysdeps/mach/hurd/_exit.c:50: multiple definition of `__GI__exit';
> elf/dl-allobjs.os:elf/../sysdeps/mach/hurd/dl-sysdep.c:728: first defined
> here
The only symbol provided by _exit.os that is not defined by
../sysdeps/mach/hurd/dl-sysdep.c is _Exit. Does anything call this
function?
> x86_64-gnu/bin/ld: libc_pic.a(strtoul.os): in function
> `__GI___strtoul_internal':
> stdlib/../sysdeps/wordsize-64/strtoul.c:108: multiple definition of
> `__GI___strtoul_internal';
> elf/dl-allobjs.os:elf/../sysdeps/mach/hurd/dl-sysdep.c:713: first defined
> here
Similarily, something is pulling in strtoul.os because it references a
symbol from there not defined by ../sysdeps/mach/hurd/dl-sysdep.c.
elf/librtld.mapT should tell you where the references come from.
> 1. What is this about, what's it even trying to do? If this is linking the
> dynamic linker (ld.so / rtld — these are the same thing, right?), then why
> does it need the dl-sysdep version if the real version is available?
The comments in ../sysdeps/mach/hurd/dl-sysdep.c indicate that the
dynamic linker wants to use some stripped down implementation of these
functions.
> 3. How come this works on i686-gnu, the duplicated symbols are clearly
> present there too!
Pure luck, perhaps.
--
Andreas Schwab, sch...@linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1
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