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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 - alpha.deadcode.UnreachableCode trivial false positive"
href="https://bugs.llvm.org/show_bug.cgi?id=39913">39913</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>alpha.deadcode.UnreachableCode trivial false positive
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</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>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Static Analyzer
</td>
</tr>
<tr>
<th>Assignee</th>
<td>dcoughlin@apple.com
</td>
</tr>
<tr>
<th>Reporter</th>
<td>abramo.bagnara@bugseng.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dcoughlin@apple.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>The typescript below shows the wrong warning and the proof it is wrong:
abramo@igor:/tmp$ cat p.c
#include <stdio.h>
void g() {
printf("reached\n");
}
void f(int btn) {
static int x = 0;
if (btn == x) {
if (btn != 0) {
g();
} else {
x = 2;
}
}
}
abramo@igor:/tmp$ cat q.c
extern void f(int);
int main() {
f(0);
f(2);
}
abramo@igor:/tmp$ scan-build-8 -enable-checker alpha.deadcode.UnreachableCode
gcc p.c q.c
scan-build: Using '/usr/lib/llvm-8/bin/clang' for static analysis
p.c:11:9: warning: This statement is never executed
g();
^
1 warning generated.
scan-build: 1 bug found.
scan-build: Run 'scan-view /tmp/scan-build-2018-12-07-124451-16359-1' to
examine bug reports.
abramo@igor:/tmp$ ./a.out
reached</pre>
</div>
</p>
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