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ebc7063c80135dd6f3e7b9418e8f4bf217bd8db7 doc: update docs for CHECK_ATOMIC macro (fanquake)
Pull request description:
Clarify that supported versions of GCC are not affected, and that Clang
prior to version 15 still requires the explicit `-latomic` linking, when
compiling for 32-bit.
ACKs for top commit:
hebasto:
ACK ebc7063c80135dd6f3e7b9418e8f4bf217bd8db7.
Tree-SHA512: 6044dc28547431cfde7e89b663b5f9a86a4cb801212a21c3dbb18a1c41a53640480c3e4e944050dc3ec4cded9bc4c1f8eae8dbb60596289fef49bb13a8b53b76
58 lines
1.5 KiB
Plaintext
58 lines
1.5 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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# Clang prior to version 15, 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++ 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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std::atomic_exchange(&lock, false);
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std::atomic<std::chrono::seconds> t{0s};
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t.store(2s);
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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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