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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Segmentation fault with -O2"
href="https://bugs.llvm.org/show_bug.cgi?id=39199">39199</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Segmentation fault with -O2
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>7.0
</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>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>dcb314@hotmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>This C code:
int a[ 1];
int b;
void c() {
void *d = b = 0;
for (;; b++)
a[b] = (int) d++;
}
seems to compile ok without optimiser on clang-7:
$ clang -c -w option-5d5829.c
$
but then the optimiser doesn't seem to like it:
$ clang -c -w -O2 option-5d5829.c
Stack dump:
0. Program arguments: /usr/bin/clang-7 -cc1 -triple
x86_64-unknown-linux-gn
u -emit-obj -disable-free -disable-llvm-verifier -discard-value-names
-main-file
-name option-5d5829.c -mrelocation-model static -mthread-model posix
-fmath-errn
o -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array
-target-c
pu x86-64 -dwarf-column-info -debugger-tuning=gdb -momit-leaf-frame-pointer
-cov
erage-notes-file /home/dcb/creduce/dcbTest/option-5d5829.gcno -resource-dir
/usr
/lib64/clang/7.0.0 -internal-isystem /usr/local/include -internal-isystem
/usr/l
ib64/clang/7.0.0/include -internal-externc-isystem /include
-internal-externc-is
ystem /usr/include -O2 -w -fdebug-compilation-dir /home/dcb/creduce/dcbTest
-fer
ror-limit 19 -fmessage-length 0 -fobjc-runtime=gcc -fdiagnostics-show-option
-ve
ctorize-loops -vectorize-slp -o option-5d5829.o -x c option-5d5829.c -faddrsig
1. <eof> parser at end of file
2. Per-module optimization passes
3. Running pass 'CallGraph Pass Manager' on module 'option-5d5829.c'.
4. Running pass 'Loop Pass Manager' on function '@c'
...</pre>
</div>
</p>
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