<html>
<head>
<base href="https://bugs.llvm.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang's -nodefaultlibs breaks XRay instrumentation"
href="https://bugs.llvm.org/show_bug.cgi?id=40579">40579</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang's -nodefaultlibs breaks XRay instrumentation
</td>
</tr>
<tr>
<th>Product</th>
<td>XRay
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Clang
</td>
</tr>
<tr>
<th>Assignee</th>
<td>dberris@google.com
</td>
</tr>
<tr>
<th>Reporter</th>
<td>lebedev.ri@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>I have just tried to build LLVM with xray instrumentation, and it fails with
CMake Warning at /build/libcxx/cmake/Modules/CheckLibcxxAtomic.cmake:52
(message):
Host compiler appears to require libatomic, but cannot find it.
Call Stack (most recent call first):
/build/libcxx/cmake/config-ix.cmake:63 (include)
/build/libcxx/CMakeLists.txt:471 (include)
CMake Error at /build/libcxx/CMakeLists.txt:526 (message):
C++11 or greater is required but the compiler does not support c++11
Configuring incomplete, errors occurred!
I have digged, and:
$ cat /tmp/test.cpp
int main(int argc, char* argv[]) {
return 0;
}
$ clang++ -fxray-instrument -fxray-instruction-threshold=0 -nodefaultlibs
/tmp/test.cpp
ld: error: undefined symbol: __libc_csu_fini
<span class="quote">>>> referenced by /usr/lib64/gcc/x86_64-linux-gnu/8/../../../x86_64-linux-gnu/crt1.o:(_start)</span >
ld: error: undefined symbol: __libc_csu_init
<span class="quote">>>> referenced by /usr/lib64/gcc/x86_64-linux-gnu/8/../../../x86_64-linux-gnu/crt1.o:(_start)</span >
ld: error: undefined symbol: __libc_start_main
<span class="quote">>>> referenced by /usr/lib64/gcc/x86_64-linux-gnu/8/../../../x86_64-linux-gnu/crt1.o:(_start)</span >
ld: error: undefined symbol: __errno_location
<span class="quote">>>> referenced by sanitizer_allocator_checks.cc.o:(__sanitizer::SetErrnoToENOMEM()) in archive /usr/lib/llvm-9/lib/clang/9.0.0/lib/linux/libclang_rt.xray-x86_64.a</span >
ld: error: undefined symbol: sigaction
<span class="quote">>>> referenced by sanitizer_linux_libcdep.cc.o:(__sanitizer::internal_sigaction(int, void const*, void*)) in archive /usr/lib/llvm-9/lib/clang/9.0.0/lib/linux/libclang_rt.xray-x86_64.a</span >
ld: error: undefined symbol: getrlimit
<span class="quote">>>> referenced by sanitizer_linux_libcdep.cc.o:(__sanitizer::GetThreadStackTopAndBottom(bool, unsigned long*, unsigned long*)) in archive /usr/lib/llvm-9/lib/clang/9.0.0/lib/linux/libclang_rt.xray-x86_64.a</span >
ld: error: undefined symbol: pthread_attr_init
<span class="quote">>>> referenced by sanitizer_linux_libcdep.cc.o:(__sanitizer::GetThreadStackTopAndBottom(bool, unsigned long*, unsigned long*)) in archive /usr/lib/llvm-9/lib/clang/9.0.0/lib/linux/libclang_rt.xray-x86_64.a</span >
ld: error: undefined symbol: pthread_self
<span class="quote">>>> referenced by sanitizer_linux_libcdep.cc.o:(__sanitizer::GetThreadStackTopAndBottom(bool, unsigned long*, unsigned long*)) in archive /usr/lib/llvm-9/lib/clang/9.0.0/lib/linux/libclang_rt.xray-x86_64.a</span >
ld: error: undefined symbol: pthread_getattr_np
<span class="quote">>>> referenced by sanitizer_linux_libcdep.cc.o:(__sanitizer::GetThreadStackTopAndBottom(bool, unsigned long*, unsigned long*)) in archive /usr/lib/llvm-9/lib/clang/9.0.0/lib/linux/libclang_rt.xray-x86_64.a</span >
ld: error: undefined symbol: pthread_attr_destroy
<span class="quote">>>> referenced by sanitizer_linux_libcdep.cc.o:(__sanitizer::GetThreadStackTopAndBottom(bool, unsigned long*, unsigned long*)) in archive /usr/lib/llvm-9/lib/clang/9.0.0/lib/linux/libclang_rt.xray-x86_64.a</span >
ld: error: undefined symbol: dlsym
<span class="quote">>>> referenced by sanitizer_linux_libcdep.cc.o:(__sanitizer::SetEnv(char const*, char const*)) in archive /usr/lib/llvm-9/lib/clang/9.0.0/lib/linux/libclang_rt.xray-x86_64.a</span >
ld: error: undefined symbol: dlsym
<span class="quote">>>> referenced by sanitizer_linux_libcdep.cc.o:(__sanitizer::InitTlsSize()) in archive /usr/lib/llvm-9/lib/clang/9.0.0/lib/linux/libclang_rt.xray-x86_64.a</span >
ld: error: undefined symbol: confstr
<span class="quote">>>> referenced by sanitizer_linux_libcdep.cc.o:(__sanitizer::ThreadDescriptorSize()) in archive /usr/lib/llvm-9/lib/clang/9.0.0/lib/linux/libclang_rt.xray-x86_64.a</span >
ld: error: undefined symbol: dl_iterate_phdr
<span class="quote">>>> referenced by sanitizer_linux_libcdep.cc.o:(__sanitizer::ListOfModules::init()) in archive /usr/lib/llvm-9/lib/clang/9.0.0/lib/linux/libclang_rt.xray-x86_64.a</span >
ld: error: undefined symbol: getrusage
<span class="quote">>>> referenced by sanitizer_linux_libcdep.cc.o:(__sanitizer::GetRSS()) in archive /usr/lib/llvm-9/lib/clang/9.0.0/lib/linux/libclang_rt.xray-x86_64.a</span >
ld: error: undefined symbol: sched_getaffinity
<span class="quote">>>> referenced by sanitizer_linux_libcdep.cc.o:(__sanitizer::GetNumberOfCPUs()) in archive /usr/lib/llvm-9/lib/clang/9.0.0/lib/linux/libclang_rt.xray-x86_64.a</span >
ld: error: undefined symbol: __sched_cpucount
<span class="quote">>>> referenced by sanitizer_linux_libcdep.cc.o:(__sanitizer::GetNumberOfCPUs()) in archive /usr/lib/llvm-9/lib/clang/9.0.0/lib/linux/libclang_rt.xray-x86_64.a</span >
ld: error: undefined symbol: syslog
<span class="quote">>>> referenced by sanitizer_linux_libcdep.cc.o:(__sanitizer::WriteOneLineToSyslog(char const*)) in archive /usr/lib/llvm-9/lib/clang/9.0.0/lib/linux/libclang_rt.xray-x86_64.a</span >
ld: error: undefined symbol: clock_gettime
<span class="quote">>>> referenced by sanitizer_linux_libcdep.cc.o:(__sanitizer::MonotonicNanoTime()) in archive /usr/lib/llvm-9/lib/clang/9.0.0/lib/linux/libclang_rt.xray-x86_64.a</span >
ld: error: undefined symbol: getauxval
<span class="quote">>>> referenced by sanitizer_linux_libcdep.cc.o:(__sanitizer::ReExec()) in archive /usr/lib/llvm-9/lib/clang/9.0.0/lib/linux/libclang_rt.xray-x86_64.a</span >
ld: error: too many errors emitted, stopping now (use -error-limit=0 to see all
errors)
clang: error: linker command failed with exit code 1 (use -v to see invocation)
$ clang++ -fxray-instrument -fxray-instruction-threshold=0 /tmp/test.cpp
$ # so it is -nodefaultlibs that is the culprit.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>