[Lazarus] embed git version info

[Xiangrong Fang]

    > How can I embed git version info AUTOMATICALLY while I compile my
program

> > in lazarus, just like {$I %DATE%} ?
>
> Use a pre-compile script (Project Options|Compiler
> Options|Compilation|Execute Before) in combination with a include file.
>

Thanks.

I realized that this may not work for me. Because I need to compile the
project under both Linux and Windows, and then I need 2 scripts in the same
place :-(

Anyway, I tested with the simplest pre-build script:

git describe --always > REVISION.INC


Then in my program I added:

msgs.Lines.Add('GIT HASH: ' + {$I REVISION.INC});

Unfortunately, it does not compile, the error I got is:

unit1.pas(831,50) Error: Identifier not found "c25d546"

It seems that this directive does not load the include file as simple
string??
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