Get third part of front-end version number

[Steven Schveighoffer via Digitalmars-d-learn]

On 4/5/16 2:11 PM, Johan Engelen wrote:
> On Tuesday, 5 April 2016 at 18:01:05 UTC, Nick Sabalausky wrote:
>> These days, DMD/DMDFE version numbers are three parts, ex: 2.070.1.
>>
>> I can get the first two via std.compiler.version_major and
>> std.compiler.version_minor. Is there a way to get the third part?
>>
>> I know I can "dmd --help | grep DMD", but that only works for DMD.
>> GDC's "gdc --version" doesn't appear to show the DMDFE version, and I
>> have no idea about LDC.
>
> "ldc2 --version" will give you the full DMDFE version it is based on.
> E.g.
> ❯ bin/ldc2 --version
> LDC - the LLVM D compiler (dff841):
>    based on DMD v2.068.2 and LLVM 3.8.0svn-r262738
>

Note dmd --version works too. This was added a few releases ago.

As for getting it inside the code itself, I'm not sure. Docs here is how 
std.compiler does it: http://dlang.org/spec/lex.html#specialtokens

Don't see a way to get patch number. Technically, it shouldn't matter, 
as there should be no functional changes in the patches, just regression 
fixes. In other words, anything compiled with 2.x.n should be compilable 
with 2.x.n+1

I realize reality isn't always so nice though.

-Steve