`h5c++ -show -c` does not work

[mtelka]

Describe the bug

When I run h5c++ -show -c it prints nothing.

Expected behavior

h5c++ -show -c prints something useful, similarly as h5cc -show -c does.

Platform

I tried following platforms:

• Rocky Linux 9 with hdf5 1.12.1 installed from the EPEL repo,
• OpenIndiana Hipster with hdf5 1.14.4-3 from the openindiana.org IPS repo.

Additional context

Rocky Linux 9:

$ h5cc -show -c
gcc -I/usr/include -c
$ h5c++ -show -c
$

OpenIndiana Hipster:

$ h5cc -show -c
/usr/gcc/13/bin/gcc -I/usr/include/hdf5 -m64 -O3 -D_LARGEFILE_SOURCE -D__EXTENSIONS__ -c -c
$ h5c++ -show -c
$

[mtelka]

Please note that h5c++ -show works properly.

The non-working h5c++ -show -c is causing problems for meson here: https://github.com/mesonbuild/meson/blob/1.5.2/mesonbuild/dependencies/hdf5.py#L123