[dmd-internals] Making druntime a shared library on linux

[Andrei Alexandrescu]

When all completed, we should make an article on the website out of this.

Andrei

On 3/25/13 3:46 PM, Walter Bright wrote:
> If you're making a D shared library, you'll need to use a shared library
> version of druntime for both the executable and your shared library.
> Otherwise, there will be two instances of druntime, and There Can Be
> Only One.
>
> I have 3 pull requests in to do this:
>
> https://github.com/D-Programming-Language/druntime/pull/462
> https://github.com/D-Programming-Language/phobos/pull/1223
> https://github.com/D-Programming-Language/dmd/pull/1798
>
> What these do is:
>
> 1. build druntime as a shared library, need -defaultlib= to do that
>
> 2. split libdruntime.a off from libphobos2.a, so now the following flags
> must be passed to the link step:
>
> -lphobos2 -ldruntime
>
> 3. add the ability to link to the shared library version of druntime
> instead, with -shared-druntime flag to dmd:
>
> -lphobos2 -ldruntimeso
>
> I couldn't find a linker flag to prefer libdruntime.so over
> libdruntime.a, or vice versa, so I named the shared library
> libdruntimeso.so. Ugh. If there's a better way, please let me know.
>
> This is currently linux only, until we get things ironed out.
>
> If you want to try out the shared druntime, you'll need to set
> LD_LIBRARY_PATH. I set mine to:
>
> LD_LIBRARY_PATH=/home/walter/cbx/mars/phobos/generated/linux/64:/home/walter/cbx/mars/phobos/generated/linux/32
>
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