Like config.h.in but in Ada

[Victor Porton]

I want to create file config.ads similar to config.h but with Ada
syntax instead of C.

I created config.ads.in, added it to configure.ac and got:

package Boiler.Config is
Data_Dir: constant String := "${prefix}/share";
end Boiler.Config;

from

package Boiler.Config is
Data_Dir: constant String := "@datadir@";
end Boiler.Config;

It is not acceptable because Ada does not understand ${prefix}.

How to make a value into an Ada string (a string delimited by double
quotes)?

It could be not ideal but acceptable if the code didn't work with paths
containing double quotes.

[Mathieu Lirzin]

Post by Victor Porton
I want to create file config.ads similar to config.h but with Ada
syntax instead of C.
package Boiler.Config is
Data_Dir: constant String := "${prefix}/share";
end Boiler.Config;
from
package Boiler.Config is
end Boiler.Config;
It is not acceptable because Ada does not understand ${prefix}.
How to make a value into an Ada string (a string delimited by double
quotes)?
It could be not ideal but acceptable if the code didn't work with paths
containing double quotes.

I have no experience with Ada however the general fix is to generate
"config.ads" at "make" time so that $prefix variable will be expanded.
in C you can achieve that with CPPFLAGS:

AM_CPPFLAGS = -DPACKAGE_LOAD_PATH=\"$(moduledir)\"

With other language this has to be done differently, you can use 'sed'
or 'config.status' in your Makefile. More details are provided in the
Autoconf manual [1].

[1] https://www.gnu.org/software/autoconf/manual/autoconf.html#Installation-Directory-Variables