Re: (dynamic-link "libm") doesn't work on guile

[ludo@gnu.org (Ludovic Courtès)]

Alex Vong <alexvong1995@gmail.com> skribis:

> I think it is weird. It seems only dynamic linking with "libc" or "libm"
> fails, dynamic linking with external library like "libpcre2-8" or
> anyhome-made shared library would work. And yes, "libc-2.22" and
> "libm-2.22" also works for me.

I think that’s because libm.so and libc.so are linker scripts, whereas
libm-2.22.so and libc-2.22.so are the actual ELF files:

--8<---------------cut here---------------start------------->8---
$ cat ~/.guix-profile/lib/libm.so
/* GNU ld script
*/
OUTPUT_FORMAT(elf64-x86-64)
GROUP ( /gnu/store/qv7bk62c22ms9i11dhfl71hnivyc82k2-glibc-2.22/lib/libm.so.6  AS_NEEDED ( /gnu/store/qv7bk62c22ms9i11dhfl71hnivyc82k2-glibc-2.22/lib/libmvec.so.1 ) )
$ cat ~/.guix-profile/lib/libc.so
/* GNU ld script
   Use the shared library, but some functions are only in
   the static library, so try that secondarily.  */
OUTPUT_FORMAT(elf64-x86-64)
GROUP ( /gnu/store/qv7bk62c22ms9i11dhfl71hnivyc82k2-glibc-2.22/lib/libc.so.6 /gnu/store/qv7bk62c22ms9i11dhfl71hnivyc82k2-glibc-2.22/lib/libc_nonshared.a  AS_NEEDED ( /gnu/store/qv7bk62c22ms9i11dhfl71hnivyc82k2-glibc-2.22/lib/ld-linux-x86-64.so.2 ) )
--8<---------------cut here---------------end--------------->8---

Ludo’.