https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111936
Bug ID: 111936
Summary: std::stacktrace cannot be used in a shared library
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: vincenzo.innocente at cern dot ch
Target Milestone: ---
I would like to use std::stacktrace in a shared library to be preloaded...
when I try to build the library even for this minimal example
cat getStacktrace.cc
#include <stacktrace>
std::string get_stacktrace() {
std::string trace;
for (auto & entry : std::stacktrace::current() ) trace +=
entry.description() + '#';
return trace;
}
it fails
c++ -O3 -Wall -pthread -fPIC -shared getStacktrace.cc -std=c++23 -lstdc++exp
/usr/bin/ld:
/afs/cern.ch/work/i/innocent/public/w5/bin/../lib/gcc/x86_64-pc-linux-gnu/14.0.0/../../../../lib64/libstdc++exp.a(std_stacktrace-fileline.o):
relocation R_X86_64_32 against `.rodata.str1.8' can not be used when making a
shared object; recompile with -fPIC
/usr/bin/ld:
/afs/cern.ch/work/i/innocent/public/w5/bin/../lib/gcc/x86_64-pc-linux-gnu/14.0.0/../../../../lib64/libstdc++exp.a(std_stacktrace-posix.o):
relocation R_X86_64_32 against `.rodata.str1.1' can not be used when making a
shared object; recompile with -fPIC
/usr/bin/ld:
/afs/cern.ch/work/i/innocent/public/w5/bin/../lib/gcc/x86_64-pc-linux-gnu/14.0.0/../../../../lib64/libstdc++exp.a(std_stacktrace-simple.o):
relocation R_X86_64_32 against `.text' can not be used when making a shared
object; recompile with -fPIC
/usr/bin/ld:
/afs/cern.ch/work/i/innocent/public/w5/bin/../lib/gcc/x86_64-pc-linux-gnu/14.0.0/../../../../lib64/libstdc++exp.a(std_stacktrace-elf.o):
relocation R_X86_64_32 against `.rodata.str1.8' can not be used when making a
shared object; recompile with -fPIC
/usr/bin/ld:
/afs/cern.ch/work/i/innocent/public/w5/bin/../lib/gcc/x86_64-pc-linux-gnu/14.0.0/../../../../lib64/libstdc++exp.a(std_stacktrace-mmap.o):
relocation R_X86_64_32 against `.rodata.str1.1' can not be used when making a
shared object; recompile with -fPIC
/usr/bin/ld:
/afs/cern.ch/work/i/innocent/public/w5/bin/../lib/gcc/x86_64-pc-linux-gnu/14.0.0/../../../../lib64/libstdc++exp.a(std_stacktrace-mmapio.o):
relocation R_X86_64_32 against `.rodata.str1.1' can not be used when making a
shared object; recompile with -fPIC
/usr/bin/ld:
/afs/cern.ch/work/i/innocent/public/w5/bin/../lib/gcc/x86_64-pc-linux-gnu/14.0.0/../../../../lib64/libstdc++exp.a(std_stacktrace-dwarf.o):
relocation R_X86_64_32 against `.rodata.str1.1' can not be used when making a
shared object; recompile with -fPIC
/usr/bin/ld: final link failed: Nonrepresentable section on output
collect2: error: ld returned 1 exit status
it silently compiles with
[innocent@patatrack01 ctest]$ c++ -O3 -Wall -pthread -fPIC -shared -std=c++23
-lstdc++exp getStacktrace.cc
but the symbols are undefined
[innocent@patatrack01 ctest]$ ldd ./a.out
linux-vdso.so.1 (0x00007ffd50f73000)
libstdc++.so.6 => /afs/cern.ch/user/i/innocent/w5/lib64/libstdc++.so.6
(0x00007fa9437f8000)
libm.so.6 => /usr/lib64/libm.so.6 (0x00007fa943476000)
libgcc_s.so.1 => /afs/cern.ch/user/i/innocent/w5/lib64/libgcc_s.so.1
(0x00007fa94324b000)
libpthread.so.0 => /usr/lib64/libpthread.so.0 (0x00007fa94302b000)
libc.so.6 => /usr/lib64/libc.so.6 (0x00007fa942c66000)
/lib64/ld-linux-x86-64.so.2 (0x00007fa943e68000)
[innocent@patatrack01 ctest]$ nm -C ./a.out | grep stack
0000000000000db0 T get_stacktrace[abi:cxx11]()
0000000000000be0 t get_stacktrace[abi:cxx11]() [clone .cold]
0000000000000d20 t std::basic_stacktrace<std::allocator<std::stacktrace_entry>
>::current(std::allocator<std::stacktrace_entry> const&) [clone .isra.0]
U std::stacktrace_entry::_Info::_M_populate(unsigned long)
0000000000001430 W std::stacktrace_entry::_Info::_S_set[abi:cxx11](void*, char
const*)
U std::__stacktrace_impl::_S_current(int (*)(void*, unsigned
long), void*, int)
0000000000001310 W std::basic_stacktrace<std::allocator<std::stacktrace_entry>
>::_M_prepare(unsigned short)::{lambda(void*, unsigned long)#1}::_FUN(void*,
unsigned long)
and at run time (not this example, my full application that invoke the
staketrace from a malloc hook) it (obviously fail)
[innocent@patatrack01 ctest]$ c++ -O3 -Wall -pthread -fPIC -shared -std=c++23
-lstdc++exp mallocWrapper.cc
[innocent@patatrack01 ctest]$ setenv LD_PRELOAD ./a.out ; ls ; unsetenv
LD_PRELOAD
Recoding structure constructed in a thread
ls: symbol lookup error: ./a.out: undefined symbol:
_ZNSt17__stacktrace_impl10_S_currentEPFiPvmES0_i
