Linking works, but ldd does not show linked libraries and runtime fails - linux

Question

I'm trying to compile a library from this repo. Running make test in the root folder produces an executable file tests that depends on libpcreposix and libpcre. The linking line looks like this:
gfortran -std=f2008 -fall-intrinsics -ffree-line-length-none -Wall -Wextra -Wpedantic -Wno-target-lifetime -Wno-compare-reals -Jbuild.gnu.debug -g -Og -fcheck=bounds,do,mem,pointer,recursion -Isrc -Itests -DUSE_PCRE tests/tests.F90 build.gnu.debug/*.o -lpcreposix -lpcre -o build.gnu.debug/tests
As you can see, the required libraries are linked via -lpcreposix -lpcre and this line executes successfully, producing executable tests, which, however, crashes at runtime. I strongly suspect that this crash has something to do with these libraries, so I ran ldd tests, which showed the following output:
$ ldd build.gnu.debug/tests
linux-vdso.so.1 (0x00007ffe5b481000)
libgfortran.so.5 => /usr/lib/x86_64-linux-gnu/libgfortran.so.5 (0x00007fd307a59000)
libm.so.6 => /usr/lib/x86_64-linux-gnu/libm.so.6 (0x00007fd30790a000)
libgcc_s.so.1 => /usr/lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007fd3078ef000)
libquadmath.so.0 => /usr/lib/x86_64-linux-gnu/libquadmath.so.0 (0x00007fd3078a5000)
libc.so.6 => /usr/lib/x86_64-linux-gnu/libc.so.6 (0x00007fd3076b3000)
/lib64/ld-linux-x86-64.so.2 (0x00007fd307e24000)
As you can see, libpcreposix and libpcre and not even on this list. The libraries were installed via sudo apt install libpcre3 libpcre3-dev and I can see them in /usr/lib/x86_64-linux-gnu/libpcreposix.so.3.13 and /usr/lib/x86_64-linux-gnu/libpcre.so.3.13.3. I have added this path to LD_LIBRARY_PATH (which did not even exist before that), but it did not change anything.
$ echo $LD_LIBRARY_PATH
/usr/lib/x86_64-linux-gnu
The executable tests definitely depends on these libraries, but just in case I have also tried to add -Wl,--no-as-needed to the linking line, which also did not change anything. I have tried the exact same sequence of actions on another machine and it worked without issues (and I was able to see the required libraries in the output of ldd), so it has to be related with the setup of my machine. The machine where I have issues is a recently created virtual machine (Ubuntu 20), so I might have forgotten to install of set up something here.
Edit:
Output of linking with -Wl,--verbose:
$ gfortran -std=f2008 -fall-intrinsics -ffree-line-length-none -Wall -Wextra -Wpedantic -Wno-target-lifetime -Wno-compare-reals -Jbuild.gnu.debug -g -Og -fcheck=bounds,do,mem,pointer,recursion -Isrc -Itests -DUSE_PCRE tests/tests.F90 build.gnu.debug/*.o -lpcreposix -lpcre -o build.gnu.debug/tests -Wl,--verbose
GNU ld (GNU Binutils for Ubuntu) 2.34
Supported emulations:
elf_x86_64
elf32_x86_64
elf_i386
elf_iamcu
elf_l1om
elf_k1om
i386pep
i386pe
using internal linker script:
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/lib/x86_64-linux-gnu/libc.so.6
attempt to open /usr/lib/x86_64-linux-gnu/libc_nonshared.a succeeded
/usr/lib/x86_64-linux-gnu/libc_nonshared.a
(/usr/lib/x86_64-linux-gnu/libc_nonshared.a)elf-init.oS
attempt to open /lib/x86_64-linux-gnu/ld-linux-x86-64.so.2 succeeded
/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2
/usr/lib/x86_64-linux-gnu/libc_nonshared.a
/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2
attempt to open /usr/lib/gcc/x86_64-linux-gnu/9/libgcc_s.so succeeded
opened script file /usr/lib/gcc/x86_64-linux-gnu/9/libgcc_s.so
/usr/lib/gcc/x86_64-linux-gnu/9/libgcc_s.so
opened script file /usr/lib/gcc/x86_64-linux-gnu/9/libgcc_s.so
attempt to open libgcc_s.so.1 failed
attempt to open /usr/lib/gcc/x86_64-linux-gnu/9/libgcc_s.so.1 failed
attempt to open /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/libgcc_s.so.1 succeeded
/usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/libgcc_s.so.1
attempt to open /usr/lib/gcc/x86_64-linux-gnu/9/libgcc.so failed
attempt to open /usr/lib/gcc/x86_64-linux-gnu/9/libgcc.a succeeded
/usr/lib/gcc/x86_64-linux-gnu/9/libgcc.a
attempt to open /usr/lib/gcc/x86_64-linux-gnu/9/libgcc.so failed
attempt to open /usr/lib/gcc/x86_64-linux-gnu/9/libgcc.a succeeded
/usr/lib/gcc/x86_64-linux-gnu/9/libgcc.a
attempt to open /usr/lib/gcc/x86_64-linux-gnu/9/crtendS.o succeeded
/usr/lib/gcc/x86_64-linux-gnu/9/crtendS.o
attempt to open /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/crtn.o succeeded
/usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/crtn.o
libquadmath.so.0 needed by /usr/lib/gcc/x86_64-linux-gnu/9/libgfortran.so
found libquadmath.so at /usr/lib/gcc/x86_64-linux-gnu/9/libquadmath.so
libgcc_s.so.1 needed by /usr/lib/gcc/x86_64-linux-gnu/9/libgfortran.so
found libgcc_s.so.1 at /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/libgcc_s.so.1
ld-linux-x86-64.so.2 needed by /usr/lib/gcc/x86_64-linux-gnu/9/libgfortran.so
found ld-linux-x86-64.so.2 at /lib/x86_64-linux-gnu/ld-linux-x86-64.so.2