[Issue 20297] New: ld: warning: building for macOS

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20297

          Issue ID: 20297
           Summary: ld: warning: building for macOS
           Product: D
           Version: D2
          Hardware: All
                OS: Mac OS X
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: doob at me.com

With Xcode 11 (or on macOS 10.15) linking an executable with an object file
built with DMD results in the following warning (one for each object file being
linked):

ld: warning: building for macOS, but linking in object file
(~/.dvm/compilers/dmd-2.088.0/osx/lib/libphobos2.a(format_5df_c43.o)) built for

The issue is that the linker is looking for a load command in each object file
which contains the platform, platform version and SDK version. Clang outputs
this load command but the DMD doesn't.

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