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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Erroneous clang -Warray-bounds warning when preprocessing its own output (Triggered by ccache)"
href="https://llvm.org/bugs/show_bug.cgi?id=26178">26178</a>
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<th>Summary</th>
<td>Erroneous clang -Warray-bounds warning when preprocessing its own output (Triggered by ccache)
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>3.7
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>shlomif@shlomifish.org
</td>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
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<pre>Hi all, please see:
* <a href="https://github.com/shlomif/ccache-clang-stray-Warray-bounds-warning-bug">https://github.com/shlomif/ccache-clang-stray-Warray-bounds-warning-bug</a>
* <a href="https://bugzilla.samba.org/show_bug.cgi?id=11674">https://bugzilla.samba.org/show_bug.cgi?id=11674</a>
When running the following command on the input (available using make bad
SYSTEM_CLANG=/path/to/clang:
/usr/bin/clang -Warray-bounds -DFCS_COMPILE_DEBUG_FUNCTIONS=1 \
-DFCS_DBM_USE_LIBAVL=1 -DFCS_DBM_WITHOUT_CACHES=1 -DFCS_DEBONDT_DELTA_STATES=1
\
-O2 -g -DNDEBUG -fvisibility=hidden -march=corei7-avx -fomit-frame-pointer \
-E pi_make_microsoft_freecell_board.c -o pi_make_microsoft_freecell_board.i &&
\
/usr/bin/clang -DFCS_COMPILE_DEBUG_FUNCTIONS=1 -DFCS_DBM_USE_LIBAVL=1 \
-DFCS_DBM_WITHOUT_CACHES=1 -DFCS_DEBONDT_DELTA_STATES=1 -O2 -g -DNDEBUG \
-fvisibility=hidden -march=corei7-avx -fomit-frame-pointer -c \
I am getting a warning:
pi_make_microsoft_freecell_board.i
pi_make_microsoft_freecell_board.c:168:2087: warning: array index 3 is past the
end of the array (which contains 3 elements) [-Warray-bounds]
...__result = (((const unsigned char *) (const char *) ("-t"))[3] -
__s2[3]...
^ ~
1 warning generated.
shlomif@telaviv1:~/Download/unpack/ccache-clang-stray-Warray-bounds-warning-bug$
I'm on Mageia Linux x86-64 v6 using clang from llvm-3.7.1-3.mga6.src.rpm .
Please look into it. Thank to Joel Rosdahl for some investigation and insights.</pre>
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