https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111936
--- Comment #1 from vincenzo Innocente <vincenzo.innocente at cern dot ch> ---
here is a minimal malloc hook that I would like to use
[innocent@patatrack01 ctest]$ cat getStacktrace.cc
#include <stacktrace>
std::string get_stacktrace() {
std::string trace;
for (auto & entry : std::stacktrace::current() ) trace +=
entry.description() + '#';
return trace;
}
#include <cstdlib>
#include <malloc.h>
#include <iostream>
extern "C"
void * myMallocHook(size_t size, void const * caller) {
__malloc_hook = nullptr;
auto p = malloc(size);
std::cout << "asked " << size
<< " at " << get_stacktrace()
<< std::endl;
__malloc_hook = myMallocHook;
return p;
}
namespace {
struct Hook {
Hook() {
__malloc_hook = myMallocHook;
}
};
Hook hook;
}
compiled as
c++ -O3 -Wall -pthread -fPIC -shared -std=c++23 -lstdc++exp getStacktrace.cc
gives the undefined symbol
setenv LD_PRELOAD ./a.out ; ls ; unsetenv LD_PRELOAD
ls: symbol lookup error: ./a.out: undefined symbol:
_ZNSt17__stacktrace_impl10_S_currentEPFiPvmES0_i
