[llvm-bugs] [Bug 39206] New: [Modules TS] Macro defined in module interface cannot be set in implementation

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39206

            Bug ID: 39206
           Summary: [Modules TS] Macro defined in module interface cannot
                    be set in implementation
           Product: clang
           Version: 7.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Modules
          Assignee: unassignedclangbugs at nondot.org
          Reporter: mwasplund at gmail.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org

Created attachment 20973
  --> https://bugs.llvm.org/attachment.cgi?id=20973&action=edit
Repro with build script

When I define a macro in a header that is included in both the implementation
and interface modules the defined checks fail in the implementation module. 

### HEADER.H
#define MACRO

### MODULE.CPPM
#include "HEADER.H"
export module MyModule;
#ifndef MACRO
#error MISSING MACRO
#end

### IMPL.CPP
#include "HEADER.H"
module MyModule;
#ifndef MACRO
#error MISSING MACRO
#end

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