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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Block scope function declaration with implicit int + GNU attribute"
href="https://bugs.llvm.org/show_bug.cgi?id=48672">48672</a>
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<th>Summary</th>
<td>Block scope function declaration with implicit int + GNU attribute
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>aaron@aaronballman.com
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
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<pre>In the following in C89 mode, h() is treated as a function declaration with an
implicit int return type in GCC, but is rejected by Clang as an invalid
declaration:
```
__attribute__(()) g(); // Accepted by both Clang and GCC
void func(void) {
__attribute__(()) h(); // Rejected by Clang, accepted by GCC
__attribute__(()) extern i(); // Accepted by both Clang and GCC
j(); // Function call expr to an implicitly-declared function j() in
// both Clang and GCC.
}
```
GCC and Clang both use the presence of a GNU-style attribute to signal that
what follows is a declaration, but it seems that Clang's handling requires some
kind of declaration specifier (like the `extern` keyword) to get this correct
at block scope.</pre>
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