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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [Modules TS] Macro defined in module interface cannot be set in implementation"
href="https://bugs.llvm.org/show_bug.cgi?id=39206">39206</a>
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<th>Summary</th>
<td>[Modules TS] Macro defined in module interface cannot be set in implementation
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>7.0
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Modules
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>mwasplund@gmail.com
</td>
</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=20973" name="attach_20973" title="Repro with build script">attachment 20973</a> <a href="attachment.cgi?id=20973&action=edit" title="Repro with build script">[details]</a></span>
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</pre>
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