relocatable.h has partial support for building without
--enable-relocatable: it #defines relocate and relocate2 to empty macros.
This is great! Could macros be similarly added for the other relocatable.h
APIs, namely set_relocation_prefix and compute_curr_prefix? This would
allow relocate-using code to be entirely #ifdef free.

This would help me currently because I am using this module from Vala.
Vala's compiler outputs C sources. In order to avoid the user of my package
needing a Vala compiler, I am taking advantage of automake's support for
shipping the generated C sources, and allowing the user to compile those
directly. However, this means that my Vala source code cannot depend on
configure-time settings. Further, Vala does not offer any way to generate
#ifdef-guarded C code.

My current solution for this situation, which I also face for
Windows-specific code, is to have separate Vala files which are built or
not according to automake settings.

For relocatable, I can also simply define my own empty macros for the above
APIs, and insert them in config.h with AH_BOTTOM. But this made my wonder
why some of the APIs, but not all, are already provided with "empty"
versions like this.

-- 
https://rrt.sc3d.org