```
dmd -shared -oflibfoo.so a1.d a2.d
dmd -ofmain -L-lfoo a2.d main.d
./main
```
gives runtime error: `The module 'foo.bar' is already defined in 'main'`

How would I work around this error?

Use case: allow partial recompilation of a binary without rebuilding everything to optimize compile time for fast edit debug cycles.

On Sunday, 11 June 2017 at 05:21:23 UTC, Timothee Cour wrote:
> ```

NOTE: this is on linux, and the above simple case doesn't reproduce
the error, but my test case is similar albeit from a larger program
that's hard to reduce.

the code that crashes is in druntime:
/**
 * Check for module collisions. A module in a shared library collides
 * with an existing module if it's ModuleInfo is interposed (search
 * symbol interposition) by another DSO.  Therefor two modules with the
 * same name do not collide if their DSOs are in separate symbol resolution
 * chains.
 */
void checkModuleCollisions(in ref dl_phdr_info info, in
immutable(ModuleInfo)*[] modules,
                           in void[] copyRelocSection) nothrow

Could someone please explain:

* what that means
* what's the simplest example that would exhibit this error
* what's a workaround ? (where i want to do partial recompilation)

On Sunday, 11 June 2017 at 07:09:33 UTC, timotheecour wrote:
> On Sunday, 11 June 2017 at 05:21:23 UTC, Timothee Cour wrote:
>> [...]
>
> NOTE: this is on linux, and the above simple case doesn't reproduce
> the error, but my test case is similar albeit from a larger program
> that's hard to reduce.
>
> [...]

On Sunday, 11 June 2017 at 07:09:33 UTC, timotheecour wrote:

Removing `-l:libphobos2.so.0.72` from dub.json "lflags" fixed the issue, but I'd like to understand why?