Bug 13774 – Multiple definition of `conv_50c_dc8` with three libraries and `std.file` import

The first library is Phobos. This code should build fine: m1.d & m2.d: --- import std.file; --- Command (for Windows): --- dmd -debug -lib m1.d dmd -debug -lib m2.d m1.lib --- m2.lib: Error: multiple definition of conv_50c_dc8: _D3std4conv52__T18emplaceInitializerTSАЕдfile15DirIterato∙АГкZАФ▒FNaNbNcNeKАЬ║4iАГ▓yАЫв and conv: _D3std4conv52__T18emplaceInitializerTSАЕдfile15DirIterato∙АГкZАФ▒FNaNbNcNeKАЬ║4iАГ▓yАЫв --- (command output is probably encoded in CP1251) This issue almost blocks Phobos usage in real projects as it breaks building libraries and linker error doesn't give any clue of its reason. Also see Issue 13359. Note: this report is about Phobos regression preventing its usage. Underlying compiler bug is some critical bug triggered by current Phobos version. Tools versions: dmd: c0e814350948feac34946c29186d17518ea954dd druntime: 2350ee4ec77d7b919454eb2f16d91b23c3891cb6 phobos: e46ccaae82d6ddbd0c98ac233562204c7007f296

Introduced in https://github.com/D-Programming-Language/dmd/pull/4102

(In reply to Vladimir Panteleev from comment #1) > Introduced in https://github.com/D-Programming-Language/dmd/pull/4102 This is actually caused by https://github.com/D-Programming-Language/dmd/pull/4099. The 4102 pull just fixed the collision detection, therefor it was identified when bisecting. The conflicting symbol is now added as COMDEF which (incorrectly?) doesn't set the pickAny parameter. https://github.com/D-Programming-Language/dmd/pull/4187

Commits pushed to master at https://github.com/D-Programming-Language/dmd https://github.com/D-Programming-Language/dmd/commit/7de68cd70f4f2b55f0ad9b98a217558f68b0e1c2 fix Issue 13774 - Multiple definition of ... - COMDEF symbols should set pickAny when being added to a library https://github.com/D-Programming-Language/dmd/commit/2044fdb74cf8328fd01b2d40dfbd8bc08185fefe Merge pull request #4187 from MartinNowak/fix13774 fix Issue 13774 - Multiple definition of ...

Commit pushed to fix13774 at https://github.com/D-Programming-Language/dmd https://github.com/D-Programming-Language/dmd/commit/9c2e3d5c9540bc3999f5d28567facc20cf85b1fe regression test for Issue 13774

Commits pushed to master at https://github.com/D-Programming-Language/dmd https://github.com/D-Programming-Language/dmd/commit/9c2e3d5c9540bc3999f5d28567facc20cf85b1fe regression test for Issue 13774 https://github.com/D-Programming-Language/dmd/commit/26ec5a62b0784caa1335be1948b30183d1f251eb Merge pull request #4188 from MartinNowak/fix13774 regression test for Issue 13774

Commits pushed to 2.067 at https://github.com/D-Programming-Language/dmd https://github.com/D-Programming-Language/dmd/commit/7de68cd70f4f2b55f0ad9b98a217558f68b0e1c2 fix Issue 13774 - Multiple definition of ... https://github.com/D-Programming-Language/dmd/commit/2044fdb74cf8328fd01b2d40dfbd8bc08185fefe Merge pull request #4187 from MartinNowak/fix13774 https://github.com/D-Programming-Language/dmd/commit/9c2e3d5c9540bc3999f5d28567facc20cf85b1fe regression test for Issue 13774 https://github.com/D-Programming-Language/dmd/commit/26ec5a62b0784caa1335be1948b30183d1f251eb Merge pull request #4188 from MartinNowak/fix13774

*** Issue 13359 has been marked as a duplicate of this issue. ***