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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang-format breaks stringized macro argument"
href="https://bugs.llvm.org/show_bug.cgi?id=46383">46383</a>
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<th>Summary</th>
<td>clang-format breaks stringized macro argument
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>release blocker
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Formatter
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>chris.hamilton@ericsson.com
</td>
</tr>
<tr>
<th>CC</th>
<td>djasper@google.com, klimek@google.com, llvm-bugs@lists.llvm.org
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=23627" name="attach_23627" title="sample source that is mishandled by clang-format">attachment 23627</a> <a href="attachment.cgi?id=23627&action=edit" title="sample source that is mishandled by clang-format">[details]</a></span>
sample source that is mishandled by clang-format
clang-format breaks a stringized macro argument into tokens, which changes the
output of the formatted code. Here's an example:
[flextools-llvm/clang-tools-extra/clang-tidy]$ $builddir/bin/clang --version
clang version 11.0.0 (xxxxxxxxx)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /repo/eahcmrh/flextools-llvm/build-debug/bin
[flextools-llvm/clang-tools-extra/clang-tidy]$ cat trythis.c
#include <stdio.h>
#define WRITETHIS(a,b) do { printf(a, "TAG:" #b); } while (0)
int main(void)
{
WRITETHIS("Output: %s\n\n", String-ized&Messy+But: :Still=Intentional);
}
[flextools-llvm/clang-tools-extra/clang-tidy]$ $builddir/bin/clang trythis.c
-o trythis
[flextools-llvm/clang-tools-extra/clang-tidy]$ ./trythis
Output: TAG:String-ized&Messy+But: :Still=Intentional
[flextools-llvm/clang-tools-extra/clang-tidy]$ $builddir/bin/clang-format
trythis.c > formatted.c
[flextools-llvm/clang-tools-extra/clang-tidy]$ cat formatted.c
#include <stdio.h>
#define WRITETHIS(a, b)
\
do {
\
printf(a, "TAG:" #b);
\
} while (0)
int main(void) {
WRITETHIS("Output: %s\n\n", String - ized &Messy + But
:
: Still = Intentional);
}
[flextools-llvm/clang-tools-extra/clang-tidy]$ $builddir/bin/clang
formatted.c -o formatted
[flextools-llvm/clang-tools-extra/clang-tidy]$ ./formatted
Output: TAG:String - ized &Messy + But : : Still = Intentional
This functional difference in clang-formatted code is incorrect.</pre>
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