[Omake] Compiling Ada code

[Dirk Heinrichs]

Am Freitag, 20. Oktober 2006 04:09 schrieb ext David Brown:

> My first question would be: what are you trying to do that gnatmake
> doesn't solve?  Generally a makefile can just invoke gnatmake with the
> main module and it will build the rest.

What about using libraries? gnatmake wil take all packages and create one 
big, statically linked executable from them. If you want to create and use 
shared libraries, you start writing .gpr files for gnatmake 
(gnatmake's "makefiles"). Unfortunately, gnatmake as a build tool is too 
limited. This is the reason why I don't use gnatmake at all.

> Attempts to do this with another 
> dependency manager wll almost always be wrong.

No, I don't think so. In the end, you can do the same as with C/C++. Compile 
the source files one by one, then link them to get either a shared lib or 
an executable.

> The rules in Ada are 
> rather compilcated, and even depend on compile time options (enabling
> inlining creates a dependency on the body, instead of just the spec, for
> example).

I'm no friend of inlining anyway. However, even this could be programmed 
into an omake function.

> GNAT's dependecies aren't really any different than they are for C. 
> (Most other Ada compilers do this very differently).  However, GNAT was
> designed around their tool gnatmake which knows how to parse the
> dependency information generated by compilation.  There is nothing to
> scan before a file is compiled.

That's exactly the problem I'm trying to solve.

> The build-prerequisites would typically be generated source files.  These
> are going to have to be specified manually, anyway.

No, why? I have some simple OMakefiles with just a few lines of code which 
simply utilize the directory structure to find out what to build, i.e. 
creating a new directory below "programs" and filling it with C files will 
result in compiling all those source files and link them to a binary with 
the same name as the directory they're in. I can even create programs/libs 
which are created from both C and Ada sources.

This works fine so far for both C and Ada programs using makepp. However, 
makepp is dog slow compared to omake and introducing a new dep scanner to 
makepp is way too complicated, so I decided to switch build tools.

Bye...

	Dirk
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