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Merge bitcoin/bitcoin#29177: build: Fix check whether -latomic needed

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f8ca1357c8205ceff732dcfb0d2bad79b40b611b build: Fix check whether `-latomic` needed (Hennadii Stepanov)

Pull request description:

  Clang >=15 still might need linking against `libatomic`.

  We use `std::atomic<std::chrono::seconds>::compare_exchange_strong` in `net_processing.cpp`.

  Addresses the https://github.com/bitcoin/bitcoin/pull/29165#discussion_r1440293694.

ACKs for top commit:
  maflcko:
    lgtm ACK f8ca1357c8205ceff732dcfb0d2bad79b40b611b
  fanquake:
    ACK f8ca1357c8205ceff732dcfb0d2bad79b40b611b

Tree-SHA512: ba8b6a88fd3471a206d068e8a000a053c99cb46d26bd04624418ddb066b3b9664a569ec8a1569af67c96b3e27f13dccbd5e24f985290ac072b6d74c92524e35d
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fanquake 2024-01-05 10:51:05 +00:00 committed by pasta
parent f670118cce
commit c75a0d4c57
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1 changed files with 3 additions and 1 deletions
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4
build-aux/m4/l_atomic.m4
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@ -4,7 +4,7 @@ dnl permitted in any medium without royalty provided the copyright notice
dnl and this notice are preserved. This file is offered as-is, without any dnl and this notice are preserved. This file is offered as-is, without any
dnl warranty. dnl warranty.
# Clang prior to version 15, when building for 32-bit, # Clang, when building for 32-bit,
# and linking against libstdc++, requires linking with # and linking against libstdc++, requires linking with
# -latomic if using the C++ atomic library. # -latomic if using the C++ atomic library.
# Can be tested with: clang++ test.cpp -m32 # Can be tested with: clang++ test.cpp -m32
@ -24,6 +24,8 @@ m4_define([_CHECK_ATOMIC_testbody], [[
std::atomic<std::chrono::seconds> t{0s}; std::atomic<std::chrono::seconds> t{0s};
t.store(2s); t.store(2s);
auto t1 = t.load();
t.compare_exchange_strong(t1, 3s);
std::atomic<int64_t> a{}; std::atomic<int64_t> a{};