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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Support/DataTypes.h requires C99 defines even when compiling in C11 mode"
href="http://llvm.org/bugs/show_bug.cgi?id=21472">21472</a>
</td>
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<th>Summary</th>
<td>Support/DataTypes.h requires C99 defines even when compiling in C11 mode
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Support Libraries
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>tilkax@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>$ echo '#include <llvm/Support/DataTypes.h>' | clang -std=c11 -xc -
In file included from <stdin>:1:
/usr/include/llvm/Support/DataTypes.h:58:3: error: "Must #define
__STDC_LIMIT_MACROS before #including Support/DataTypes.h"
# error "Must #define __STDC_LIMIT_MACROS before #including
Support/DataTypes.h"
^
/usr/include/llvm/Support/DataTypes.h:62:3: error: "Must #define
__STDC_CONSTANT_MACROS before " "#including Support/DataTypes.h"
# error "Must #define __STDC_CONSTANT_MACROS before " \
^
2 errors generated.
The explanation in DataTypes.h:
"Note that this header's correct operation depends on __STDC_LIMIT_MACROS being
defined. We would define it here, but in order to prevent Bad Things happening
when system headers or C++ STL headers include stdint.h before we define it
here, we define it on the g++ command line (in Makefile.rules)."
I don't think this applies when compiling in C11 mode, e.g. when including this
header from third-party code.
Suggested fix: Surround the error message with "#if __STDC_VERSION__ < 201112L"
or something to that effect.</pre>
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