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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [PCH, DebugInfo] Precompiled headers does not support debug info macro directives."
href="https://bugs.llvm.org/show_bug.cgi?id=31945">31945</a>
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<th>Summary</th>
<td>[PCH, DebugInfo] Precompiled headers does not support debug info macro directives.
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Frontend
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>amjad.aboud@intel.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Debug info macro is supported in LLVM when using -fdebug-macro flag.
However, PCH files does not preserve the debug info macro.
header.h:
#define MyMacro(x) (x + 1)
source.c
// empty
$ clang -c -include header.h -emit-llvm -S -g -fdebug-macro -o source.ll
source.c
$ grep MyMacro source.ll
!DIMacro(type: DW_MACINFO_define, line: 1, name: "MyMacro(x)", value: "(x +
1)")
$ clang -x c-header -g -fdebug-macro -o header.pch header.h
$ clang -c -include-pch header.pch -emit-llvm -S -g -fdebug-macro -o
source.ll source.c
$ grep MyMacro source.ll
Nothing!
Need to support all three directives:
#define, #undef, #include</pre>
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