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Report why a simulation setup library cannot be loaded #16089

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Merged
sawenzel merged 1 commit into from
Nov 9, 2026
Merged

Report why a simulation setup library cannot be loaded #16089

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33 changes: 14 additions & 19 deletions Detectors/gconfig/src/SimSetup.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -14,12 +14,9 @@
#include "TVirtualMC.h"
#include <fairlogger/Logger.h>
#include "SetCuts.h"
#include "CommonUtils/DLLoaderBase.h"
#include <dlfcn.h>
#ifdef NDEBUG
#undef NDEBUG
#endif
#include <cassert>
#include <sstream>
#include <string>

namespace o2
{
Expand All @@ -28,23 +25,21 @@ typedef void (*setup_fnc)();

void execFromPlugin(const char* libname, const char* funcname)
{
auto libHandle = dlopen(libname, RTLD_NOW);
// try to make the library loading a bit more portable:
const std::string filename = std::string(libname) + DLLOADER_MAC_LINUX(".dylib", ".so");
auto libHandle = dlopen(filename.c_str(), RTLD_NOW);
if (!libHandle) {
// try appending *.so
std::stringstream stream;
stream << libname << ".so";
libHandle = dlopen(stream.str().c_str(), RTLD_NOW);
const char* error = dlerror();
LOG(fatal) << "Cannot load " << filename << ": " << (error ? error : "unknown error");
// LOG(fatal) ends the process only when a fatal handler is installed
throw fair::FatalException("Cannot load " + filename);
}
if (!libHandle) {
// try appending *.dylib
std::stringstream stream;
stream << libname << ".dylib";
libHandle = dlopen(stream.str().c_str(), RTLD_NOW);
}
assert(libHandle);
dlerror(); // clear any pending error before dlsym
auto func = (setup_fnc)dlsym(libHandle, funcname);
assert(func);
if (!func) {
const char* error = dlerror();
LOG(fatal) << "Cannot find " << funcname << " in " << filename << ": " << (error ? error : "the symbol is null");
throw fair::FatalException("Cannot find " + std::string(funcname) + " in " + filename);
}
func();
}

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