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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang detects dollars in macro arguments instead of identifiers."
href="https://bugs.llvm.org/show_bug.cgi?id=50600">50600</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang detects dollars in macro arguments instead of identifiers.
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>12.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Macintosh
</td>
</tr>
<tr>
<th>OS</th>
<td>MacOS X
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>C
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>pjb@informatimago.com
</td>
</tr>
<tr>
<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
</td>
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<p>
<div>
<pre>clang detects a dollar in identifier, when there is no such
identifier, but only a string, as per the macro. It should do that after
macro-expansion, not before.
Makefile:
```
all:
clang -Wdollar-in-identifier-extension -o pgm gcc-dollar-bug.c
./pgm
```
gcc-dollar-bug.c:
```
#include <stdio.h>
#define S(x) #x
int main(void){
printf("Good string: %s\n",S($HELLO));
return 0;}
```
```
[pjb@despina org.xquartz:0 gcc-dollar-<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED WONTFIX - email prefs pane changes don't stick"
href="show_bug.cgi?id=23">bug 23</a>Gi]$ make
clang -Wdollar-in-identifier-extension -o pgm gcc-dollar-bug.c
gcc-dollar-bug.c:6:34: warning: '$' in identifier
[-Wdollar-in-identifier-extension]
printf("Good string: %s\n",S($HELLO));
^
1 warning generated.
./pgm
Good string: $HELLO
[pjb@despina org.xquartz:0 gcc-dollar-<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED WONTFIX - email prefs pane changes don't stick"
href="show_bug.cgi?id=23">bug 23</a>Gi]$
#+END_EXAMPLE
```</pre>
</div>
</p>
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