• Leandro Motta Barros (13/13) Mar 30 2013 Hello,
• bearophile (4/9) Mar 30 2013 Take a look at -version=...
• Tobias Pankrath (13/19) Mar 31 2013 D has no preprocessor and no way to define global variables via a
• Leandro Motta Barros (5/25) Mar 31 2013 Hello Tobias,

Leandro Motta Barros <lmb stackedboxes.org> writes:

Hello,

I'd like to include the version control revision tag in a program. In
the C/C++ world I'd make my build system call the compiler like this:

   g++ -D<MY_REVISION_HERE> .....

so that the revision is available as a preprocessor symbol.

Is there an easy way to achieve the same in D? I can think of
convoluted solutions, like making the build system generate a .d file
containing a constant with the revision tag, but I'd naturally prefer
a simpler solution.

I am using DMD, but a solution that works for other D compilers gets
extra credit :-)

Thanks!

LMB

"bearophile" <bearophileHUGS lycos.com> writes:

Leandro Motta Barros:

 I'd like to include the version control revision tag in a 
 program. In
 the C/C++ world I'd make my build system call the compiler like 
 this:

    g++ -D<MY_REVISION_HERE> .....

Take a look at -version=...

Bye,
bearophile

"Tobias Pankrath" <tobias pankrath.net> writes:

On Sunday, 31 March 2013 at 02:00:46 UTC, Leandro Motta Barros 
wrote:
 Hello,

 I'd like to include the version control revision tag in a 
 program. In
 the C/C++ world I'd make my build system call the compiler like 
 this:

    g++ -D<MY_REVISION_HERE> .....

D has no preprocessor and no way to define global variables via a 
cmdline switch. The -version switch can be used conditionally 
compile in blocks of code but wont help you to "import" a value 
into your program. You can however use import expressions for 
this.

See http://dlang.org/expression.html search import expression.

---
immutable Revision = import("revision.data");
---
And tell your VCS to always keep the revision in that file. DMD 
looks for imports in directories specified by the -J option.

Leandro Motta Barros <lmb stackedboxes.org> writes:

On Sun, Mar 31, 2013 at 10:09 AM, Tobias Pankrath <tobias pankrath.net> wrote:
 On Sunday, 31 March 2013 at 02:00:46 UTC, Leandro Motta Barros wrote:
 Hello,


 I'd like to include the version control revision tag in a program. In
 the C/C++ world I'd make my build system call the compiler like this:

    g++ -D<MY_REVISION_HERE> .....

 D has no preprocessor and no way to define global variables via a cmdline
 switch. The -version switch can be used conditionally compile in blocks of
 code but wont help you to "import" a value into your program. You can
 however use import expressions for this.

 See http://dlang.org/expression.html search import expression.

 ---
 immutable Revision = import("revision.data");
 ---
 And tell your VCS to always keep the revision in that file. DMD looks for
 imports in directories specified by the -J option.

Hello Tobias,

I have (miss)used import expressions before, but I forgot I could use them here.

Thanks a lot!

LMB