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// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set et ts=4 sw=2 sts=2:
// SPDX-FileCopyrightInfo: Copyright © DUNE Project contributors, see file LICENSE.md in module root
// SPDX-License-Identifier: LicenseRef-GPL-2.0-only-with-DUNE-exception
#include <cstdlib>
#include <iostream>
#include <mutex>
#include <ostream>
#include <dune/common/stdthread.hh>
namespace Dune
{
namespace {
void printCallOnceError(const char *file, int line, const char *function,
const char *msg)
{
if(file)
std::cerr << file << ":" << line << ": ";
std::cerr << "error: ";
if(function)
std::cerr << "(in " << function << "()) ";
std::cerr << "std::call_once() is broken.\n"
<< "\n"
<< msg << std::endl;
}
void setBool(bool *v)
{
*v = true;
}
} // anonymous namespace
void doAssertCallOnce(const char *file, int line, const char *function)
{
std::once_flag once;
bool works = false;
try {
// pass address to works since call_once passes by value
std::call_once(once, setBool, &works);
}
catch(...) {
printCallOnceError(file, line, function,
"std::call_once() throws an exception. This suggests that the program was\n"
"linked without a threading library. Common ways to link to a threading\n"
"library is to specify one of the following during linking: -pthread, \n"
"-lpthread, or -pthreads. The build system should have tried various of\n"
"these options, but unfortunately that is only a guess and we cannot verify\n"
"that we found a working configuration until runtime.\n"
"\n"
"Going to rethrow the exception now to give the system library a chance to\n"
"print more information about it, just in case that helps with debugging.\n"
);
throw;
}
if(!works)
{
printCallOnceError(file, line, function,
"std::call_once() never calls the function. This suggests that your\n"
"libctdc++ or your gcc built without threading support (--disable-threads,\n"
"see https://gcc.gnu.org/install/configure.html). This is probably a bug in\n"
"__gthread_once() in /usr/include/c++/4.7/x86_64-linux-gnu/bits/gthr-single.h\n"
"(which should not silently return success without doing anything, but\n"
"apparently does so in some versions).\n"
"\n"
"To fix the issue, either recompile gcc with a working threading\n"
"implementation, or file a bug for gthr-single.h, or file a bug at\n"
"https://dune-project.org/flyspray/ and request a workaround at the dune-side."
);
std::abort();
}
}
} // namespace Dune
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