dmd -unittest doesn't work when linking against a shared library

[dlangBugzillaToGithub]

Timothee Cour (@timotheecour) reported this on 2017-12-07T22:16:21Z

Transferred from https://issues.dlang.org/show_bug.cgi?id=18046

CC List

• David Nadlinger (@MartinNowak)
• Timothee Cour

Description

on OSX, dmd -unittest doesn't work when linking against a shared library (but works when linking against a static library): even though main2.d was compiled with -unittest, main2's unittest isn't called.

dmd --version
DMD64 D Compiler v2.077.0

dmd -of=build//libfoo.dylib -shared -unittest foo.d
dmd -unittest -ofbuild/./main -L-lfoo -L-Lbuild/ main2.d foo.d
build/./main
u:foo

rm build//libfoo.dylib

dmd -of=build//libfoo.a -lib -unittest foo.d
dmd -unittest -ofbuild/./main -L-lfoo -L-Lbuild/ main2.d foo.d
build/./main
u:main2
u:foo


#####
./main2.d:
module main2;

import std.stdio;
import foo;

void main(){}

unittest{
        import std.stdio;
        writeln("u:main2");
}


./foo.d:
module foo;
void fun(){}

unittest{
        import std.stdio;
        writeln("u:foo");
}

[dlangBugzillaToGithub]

timothee.cour2 commented on 2017-12-09T00:30:21Z

same with ldmd2:

ldmd2 -of=build//libfoo.dylib -shared -unittest foo.d
ldmd2 -unittest -ofbuild/./main -L-lfoo -L-Lbuild/ main2.d foo.d
build/./main

ldmd2 --version
LDC - the LLVM D compiler (1.6.0):
  based on DMD v2.076.1 and LLVM 5.0.0
  built with LDC - the LLVM D compiler (0.17.5)

[dlangBugzillaToGithub]

code (@MartinNowak) commented on 2017-12-09T01:51:51Z

(In reply to Timothee Cour from comment #1)
> same with ldmd2:
> 
> ldmd2 -of=build//libfoo.dylib -shared -unittest foo.d
> ldmd2 -unittest -ofbuild/./main -L-lfoo -L-Lbuild/ main2.d foo.d
> build/./main
> 
> ldmd2 --version
> LDC - the LLVM D compiler (1.6.0):
>   based on DMD v2.076.1 and LLVM 5.0.0
>   built with LDC - the LLVM D compiler (0.17.5)

This only occurs when not linking against the shared runtime (druntime/Phobos), which is a prerequisite for using shared libraries in user code.

Note also that you are compiling foo.d twice, which will be (correctly) rejected by LDC on startup. (The module collision check has been removed in druntime master, so you won't be protected against this mistake in the future, but it's still not what you want.)

After fixing that, LDC gives

u:foo
u:main2

as expected.