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66 lines
1.7 KiB
66 lines
1.7 KiB
dnl Copyright (c) 2015 Tim Kosse <tim.kosse@filezilla-project.org>
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dnl Copying and distribution of this file, with or without modification, are
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dnl permitted in any medium without royalty provided the copyright notice
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dnl and this notice are preserved. This file is offered as-is, without any
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dnl warranty.
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# Clang, when building for 32-bit,
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# and linking against libstdc++, requires linking with
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# -latomic if using the C++ atomic library.
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# Can be tested with: clang++ -std=c++20 test.cpp -m32
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#
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# Sourced from http://bugs.debian.org/797228
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m4_define([_CHECK_ATOMIC_testbody], [[
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#include <atomic>
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#include <cstdint>
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#include <chrono>
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using namespace std::chrono_literals;
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int main() {
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std::atomic<bool> lock{true};
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lock.exchange(false);
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std::atomic<std::chrono::seconds> t{0s};
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t.store(2s);
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auto t1 = t.load();
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t.compare_exchange_strong(t1, 3s);
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std::atomic<double> d{};
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d.store(3.14);
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auto d1 = d.load();
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std::atomic<int64_t> a{};
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int64_t v = 5;
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int64_t r = a.fetch_add(v);
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return static_cast<int>(r);
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}
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]])
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AC_DEFUN([CHECK_ATOMIC], [
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AC_LANG_PUSH(C++)
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TEMP_CXXFLAGS="$CXXFLAGS"
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CXXFLAGS="$CXXFLAGS $PTHREAD_CFLAGS"
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AC_MSG_CHECKING([whether std::atomic can be used without link library])
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AC_LINK_IFELSE([AC_LANG_SOURCE([_CHECK_ATOMIC_testbody])],[
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AC_MSG_RESULT([yes])
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],[
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AC_MSG_RESULT([no])
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LIBS="$LIBS -latomic"
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AC_MSG_CHECKING([whether std::atomic needs -latomic])
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AC_LINK_IFELSE([AC_LANG_SOURCE([_CHECK_ATOMIC_testbody])],[
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AC_MSG_RESULT([yes])
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],[
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AC_MSG_RESULT([no])
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AC_MSG_FAILURE([cannot figure out how to use std::atomic])
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])
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])
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CXXFLAGS="$TEMP_CXXFLAGS"
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AC_LANG_POP
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])
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