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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 - error in backend: Prototypeless function used with conflicting signatures"
href="https://bugs.llvm.org/show_bug.cgi?id=40472">40472</a>
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</tr>
<tr>
<th>Summary</th>
<td>error in backend: Prototypeless function used with conflicting signatures
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</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>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Backend: WebAssembly
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>alonzakai@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
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<pre>STR: a.c is
===
#include <stdio.h>
int main()
{
printf("hello %d\n", strnlen("waka", 2)); // Implicit declaration, no
header, for strnlen
int (*my_strnlen)(char*, ...) = strnlen;
printf("hello %d\n", my_strnlen("shaka", 2));
return 0;
}
===
Build with
./emcc a.c -Wno-implicit-function-declaration
Output is
===
a.c:5:11: warning: incompatible pointer types initializing 'int (*)(char *,
...)' with an expression of type 'int ()' [-Wincompatible-pointer-types]
int (*my_strnlen)(char*, ...) = strnlen;
^ ~~~~~~~
fatal error: error in backend: Prototypeless function used with conflicting
signatures: strnlen
clang-8: error: clang frontend command failed with exit code 70 (use -v to see
invocation)
clang version 9.0.0 (<a href="mailto:git@github.com">git@github.com</a>:llvm-mirror/clang.git
0a4307de1174f61c465c94111f8376d3f5ed548e) (<a href="mailto:git@github.com">git@github.com</a>:llvm-mirror/llvm.git
74ebd8a99755a5e0e1c14001de05fc089f0ee28f)
Target: wasm32-unknown-unknown-wasm
===
(The warning is correct.)</pre>
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