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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang -pg produces invalid binaries on FreeBSD"
href="https://bugs.llvm.org/show_bug.cgi?id=48165">48165</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang -pg produces invalid binaries on FreeBSD
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>10.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>FreeBSD
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>C
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>oleg-derevenetz@yandex.ru
</td>
</tr>
<tr>
<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
</td>
</tr></table>
<p>
<div>
<pre>Consider the following program:
$ cat test.c
#include <stdio.h>
int main()
{
printf("OK\n");
}
When built using the following command:
$ clang -pg test.c
the following binary is produced:
$ file a.out
a.out: ELF 64-bit LSB executable, x86-64, version 1 (FreeBSD), statically
linked, interpreter /libexec/ld-elf.so.1, for FreeBSD 12.2, FreeBSD-style, with
debug_info, not stripped
(note the "interpreter /libexec/ld-elf.so.1" part).
Once launched, it crashes inside ld-elf.so.1 with SIGSEGV:
$ lldb a.out
(lldb) target create "a.out"
Current executable set to '/usr/home/oleg/tmp/pg/a.out' (x86_64).
(lldb) run
Process 872 launching
Process 872 launched: '/usr/home/oleg/tmp/pg/a.out' (x86_64)
Process 872 stopped
* thread #1, name = 'a.out', stop reason = signal SIGSEGV: invalid address
(fault address: 0x0)
frame #0: 0x00000008002a3ab0
-> 0x8002a3ab0: movq (%r15), %rdx
0x8002a3ab3: cmpq $0x6fffffef, %rdx ; imm = 0x6FFFFFEF
0x8002a3aba: jg 0x8002a3b10
0x8002a3abc: cmpq $0x21, %rdx
(lldb) disassemble
-> 0x8002a3ab0: movq (%r15), %rdx
0x8002a3ab3: cmpq $0x6fffffef, %rdx ; imm = 0x6FFFFFEF
0x8002a3aba: jg 0x8002a3b10
0x8002a3abc: cmpq $0x21, %rdx
0x8002a3ac0: ja 0x8002a3ba6
0x8002a3ac6: movslq (%r12,%rdx,4), %rax
0x8002a3aca: addq %r12, %rax
0x8002a3acd: jmpq *%rax
(lldb)
Disassembled code above is apparently from ld-elf.so.1/_rtld_is_dlopened.
However, if the following command is used for the build:
$ clang -pg -static test.c
the following binary is produced:
$ file a.out
a.out: ELF 64-bit LSB executable, x86-64, version 1 (FreeBSD), statically
linked, for FreeBSD 12.2, FreeBSD-style, with debug_info, not stripped
(note the absence of "interpreter ..." part). This binary runs just fine:
$ lldb a.out
(lldb) target create "a.out"
Current executable set to '/usr/home/oleg/tmp/pg/a.out' (x86_64).
(lldb) run
Process 914 launching
Process 914 launched: '/usr/home/oleg/tmp/pg/a.out' (x86_64)
OK
Process 914 exited with status = 0 (0x00000000)
(lldb)
$ clang --version
FreeBSD clang version 10.0.1 (<a href="mailto:git@github.com">git@github.com</a>:llvm/llvm-project.git
llvmorg-10.0.1-0-gef32c611aa2)
Target: x86_64-unknown-freebsd12.2
Thread model: posix
InstalledDir: /usr/bin</pre>
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