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build: Fix check whether -latomic needed #29177

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Jan 5, 2024
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build: Fix check whether -latomic needed #29177

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4 changes: 3 additions & 1 deletion build-aux/m4/l_atomic.m4
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Original file line number Diff line number Diff line change
Expand Up @@ -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 warranty.

# Clang prior to version 15, when building for 32-bit,
# Clang, when building for 32-bit,
# and linking against libstdc++, requires linking with
# -latomic if using the C++ atomic library.
# Can be tested with: clang++ test.cpp -m32
Expand All @@ -24,6 +24,8 @@ m4_define([_CHECK_ATOMIC_testbody], [[

std::atomic<std::chrono::seconds> t{0s};
t.store(2s);
auto t1 = t.load();
t.compare_exchange_strong(t1, 3s);

std::atomic<int64_t> a{};

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