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Bug 19395 – extern(C++) mangling: posix mangling does not support `S_` token

Status: RESOLVED
Resolution: INVALID
Severity: major
Priority: P1
Component: dmd
Product: D
Version: D2
Platform: All
OS: All
Creation time: 2018-11-13T05:24:25Z
Last change time: 2019-06-14T01:50:32Z
Keywords: C++
Assigned to: No Owner
Creator: Manu

Comments

Comment #0 by turkeyman — 2018-11-13T05:24:25Z

Posix mangling uses an `S_`, `S0_`, `S1_`, ... token to repeat the prior element in the mangled name. Without supporting this, we fail to mangle functions with repeated arguments: void fun(wchar x, wchar y, bool b); <-- __Z3funDsS_b (ie; Ds is repeated once)

Comment #1 by pro.mathias.lang — 2019-06-14T01:50:32Z

DMD does substitution. However substitution is not done on basic types. The following C++ code: void fun(wchar_t x, wchar_t y, bool b) {} Mangles to: __Z3funwwb On my machine (OSX, so Clang). Hit me up on Slack if there's some POSIX mangling issue you need to troubleshoot.