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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 - Linking fails on C programs with xray instrumentation enabled"
href="https://bugs.llvm.org/show_bug.cgi?id=34904">34904</a>
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</tr>
<tr>
<th>Summary</th>
<td>Linking fails on C programs with xray instrumentation enabled
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</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>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>jbulow-llvm@jongel.net
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>According to documentation it should be possible to use xray instrumentation on
C program by specifying the flags -fxray-instrument.
Linking fails when compiling the following program:
----8<----- (minimal.c)
int main ()
{
return 0;
}
----8<-----
$ clang --version
clang version 6.0.0 (trunk 315272)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jonasbu/local/bin
$ clang -fxray-instrument minimal.c
/home/jonasbu/local/lib/clang/6.0.0/lib/linux/libclang_rt.xray-x86_64.a(xray_inmemory_log.cc.o):
In function `getGlobalFd()':
/home/jonasbu/llvm-clang/llvm/projects/compiler-rt/lib/xray/xray_inmemory_log.cc:123:
undefined reference to `__cxa_guard_acquire'
/home/jonasbu/llvm-clang/llvm/projects/compiler-rt/lib/xray/xray_inmemory_log.cc:123:
undefined reference to `__cxa_guard_release'
/home/jonasbu/local/lib/clang/6.0.0/lib/linux/libclang_rt.xray-x86_64.a(xray_inmemory_log.cc.o):
In function `__xray_InMemoryRawLog<__xray_InMemoryEmulateTSC(int32_t,
XRayEntryType)::<lambda(uint8_t&)> >':
/home/jonasbu/llvm-clang/llvm/projects/compiler-rt/lib/xray/xray_inmemory_log.cc:136:
undefined reference to `__cxa_thread_atexit'
/home/jonasbu/local/lib/clang/6.0.0/lib/linux/libclang_rt.xray-x86_64.a(xray_inmemory_log.cc.o):
In function `__xray_OpenLogFile':
/home/jonasbu/llvm-clang/llvm/projects/compiler-rt/lib/xray/xray_inmemory_log.cc:85:
undefined reference to `__cxa_guard_acquire'
/home/jonasbu/llvm-clang/llvm/projects/compiler-rt/lib/xray/xray_inmemory_log.cc:85:
undefined reference to `__cxa_guard_release'
/home/jonasbu/llvm-clang/llvm/projects/compiler-rt/lib/xray/xray_inmemory_log.cc:87:
undefined reference to `__cxa_guard_acquire'
/home/jonasbu/llvm-clang/llvm/projects/compiler-rt/lib/xray/xray_inmemory_log.cc:87:
undefined reference to `__cxa_guard_release'
...
...
...
As expected, the same program compiles and links fine as a C++ program:
$ clang++ -xc++ -fxray-instrument minimal.c
<no output>
$</pre>
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</p>
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