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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - `register` keyword with inline assembly is still needed"
href="https://bugs.llvm.org/show_bug.cgi?id=42620">42620</a>
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<th>Summary</th>
<td>`register` keyword with inline assembly is still needed
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>unspecified
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Linux
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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++17
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>kutdanila@yandex.ru
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<th>CC</th>
<td>blitzrakete@gmail.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>Hi, with C++17 `register` keyword was completely removed with its semantics.
Although, while trying to remove it from code base we faced unexpected warning
that clang produced.
E.g.
int main() {
int r asm ("cx") = 0;
return r;
}
Such code will compile with a warning `ignored asm label 'cx' on automatic
variable [-Werror]`
If we add the word `register` before `int r`, it will compile without any
warning
<a href="https://gcc.godbolt.org/z/gxFa6P">https://gcc.godbolt.org/z/gxFa6P</a>
I saw tests like this somewhere in test/Sema/asm.c. So my question is -- do we
actually need this keyword before the inline assembly that assigns some
register value?</pre>
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