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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 - __builtin_constant_p with statement expression leaks destructor calls"
href="https://bugs.llvm.org/show_bug.cgi?id=45535">45535</a>
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<th>Summary</th>
<td>__builtin_constant_p with statement expression leaks destructor calls
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
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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>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>hstong@ca.ibm.com
</td>
</tr>
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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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<pre>Destructors associated with statement expressions within the operand of
__builtin_constant_p end up actually being called(!)
### SOURCE (<stdin>):
struct S { ~S(); };
int f(void) { return __builtin_constant_p(({S s; 42;})); }
### COMPILER INVOCATION:
clang -cc1 -xc++ - -O2 -S -o -
### ACTUAL OUTPUT:
.text
.file "-"
.globl _Z1fv # -- Begin function _Z1fv
.p2align 4, 0x90
.type _Z1fv,@function
_Z1fv: # @_Z1fv
# %bb.0: # %entry
pushq %rax
movq %rsp, %rdi
callq _ZN1SD1Ev@PLT
movl $1, %eax
popq %rcx
retq
.Lfunc_end0:
.size _Z1fv, .Lfunc_end0-_Z1fv
# -- End function
.ident "clang version 11.0.0 (<a href="https://github.com/llvm/llvm-project.git">https://github.com/llvm/llvm-project.git</a>
4d9f5f135fad9eafa78ded8589af99a593415102)"
.section ".note.GNU-stack","",@progbits
### EXPECTED OUTPUT:
(
Something without
callq _ZN1SD1Ev@PLT
)
### COMPILER VERSION INFO (clang -v):
clang version 11.0.0 (<a href="https://github.com/llvm/llvm-project.git">https://github.com/llvm/llvm-project.git</a>
4d9f5f135fad9eafa78ded8589af99a593415102)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/wandbox/clang-head/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.4.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/9
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.4.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64</pre>
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