• Tim K. (16/16) Sep 17 2015 Hi!
• Rikki Cattermole (3/18) Sep 17 2015 Well string imports, could work.
• Adam D. Ruppe (8/11) Sep 17 2015 My preference is to make an app.config module that lists these

Tim K. <iReadThe webForum.com> writes:

Hi!

I am wondering if there is any way to define constants to pass to 
the compiler like in C (especially useful in combination with 
Makefiles, for obvious reasons), i.e.:

     gcc -DPREFIX=\"/usr/local\" -o myprogram main.c

Like this a program can look for certain files inside its prefix 
during runtime and the prefix can be modified for installation in 
different locations (like /usr, ~/bin, ...) at compile time.

But how do I do something like this in D? I am using GDC, but I'd 
be interested for solutions for DMD as well. Calling 
standard-library functions at runtime to figure out where the 
binary is located is okay for my current problem as well, but 
it's not as flexible as the "define whatever data at compile time 
and have it available at runtime".


Regards,
Tim

Rikki Cattermole <alphaglosined gmail.com> writes:

On 18/09/15 3:32 AM, Tim K. wrote:
 Hi!

 I am wondering if there is any way to define constants to pass to the
 compiler like in C (especially useful in combination with Makefiles, for
 obvious reasons), i.e.:

      gcc -DPREFIX=\"/usr/local\" -o myprogram main.c

 Like this a program can look for certain files inside its prefix during
 runtime and the prefix can be modified for installation in different
 locations (like /usr, ~/bin, ...) at compile time.

 But how do I do something like this in D? I am using GDC, but I'd be
 interested for solutions for DMD as well. Calling standard-library
 functions at runtime to figure out where the binary is located is okay
 for my current problem as well, but it's not as flexible as the "define
 whatever data at compile time and have it available at runtime".


 Regards,
 Tim

Well string imports, could work.
But you would need to save it to a file first.

Adam D. Ruppe <destructionator gmail.com> writes:

On Thursday, 17 September 2015 at 15:32:25 UTC, Tim K. wrote:
 I am wondering if there is any way to define constants to pass 
 to the compiler like in C (especially useful in combination 
 with Makefiles, for obvious reasons), i.e.:

My preference is to make an app.config module that lists these 
things as variables (or enums) in ordinary D code. Then tell 
users to edit that file to customize their build. (wp_config.php 
does this and people are reasonably happy with it. You could even 
write a little creation app if you wanted to avoid plain editing 
the file. Like makeconfig PREFIX="/usr/local" and it writes out 
the config.d file.)