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50 lines
1.3 KiB
Plaintext
50 lines
1.3 KiB
Plaintext
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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# Some versions of gcc/libstdc++ require linking with -latomic if
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# using the C++ atomic library.
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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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int main() {
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std::atomic<bool> lock{true};
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std::atomic_exchange(&lock, false);
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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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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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AC_LANG_POP
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])
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