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    <head>
      <base href="https://bugs.llvm.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Unsequenced warnings displayed inconsistently"
   href="https://bugs.llvm.org/show_bug.cgi?id=37999">37999</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Unsequenced warnings displayed inconsistently
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>clang
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>6.0
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux
          </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>-New Bugs
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedclangbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>dilyan.palauzov@aegee.org
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>With this program:

#include <ctype.h>
#include <stdio.h>

int main() {
  char g[] = "ABC";
  int i =0;
  g[i] = tolower(g[i++]);
  printf("g=%s, i=%i\n", g, i);
}

and clang 6.0.0 (not 6.0.1) I get:

$ clang -O0 plus.c
plus.c:7:21: warning: unsequenced modification and access to 'i'
[-Wunsequenced]
  g[i] = tolower(g[i++]);
    ~               ^
1 warning generated.

but 
$ clang -O1 plus.c
-> No warnings

As the first call (-O0) emits warnings, I would expect that the second call
(-O1) emits the same warnings.</pre>
        </div>
      </p>


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