[Issue 20421] New: Exceptions don't work when linking through lld-link

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20421

          Issue ID: 20421
           Summary: Exceptions don't work when linking through lld-link
           Product: D
           Version: D2
          Hardware: x86
                OS: Windows
            Status: NEW
          Severity: major
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: r.sagitario at gmx.de

import std.stdio;
void main(){
    try    {
        throw new Exception("first");
    } catch (Exception e)    {
        writeln("catch ", e.msg);
    }
    writeln("done");
}

Building this with against the mingw libs with

> dmd.exe -m32mscoff test.d -mscrtlib=msvcrt100

generates an executable that doesn't produce any output, but silently crashes.

When run in a debugger, it reports:
Unhandled exception at 0x004010EF in x.exe: 0xC00001A5: An invalid exception
handler routine has been detected (parameters: 0x00000001).


This seems to happen when lld is used instead of the Microsoft linker.

Using lld from LLVM 9 spits out errors "not compatible with SEH", but links
using /SAFESEH:NO. The resulting executable then works.

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