Alignment problem with boost/interprocess/segment_manager on SPARC 32Bit / Boost 1.84

[TomSmartBishop]

As requested by @igaztanaga on https://cpplang.slack.com/archives/C27KZLB0X/p1710326590253599 I'm opening an issue here.

I'm creating a shared memory:

TEST(SharedMemoryManagerTest, PlainTest) {
	struct TestData {
		std::chrono::time_point<std::chrono::steady_clock>  c1{};
		std::chrono::time_point<std::chrono::steady_clock>  c2{};
		uint32_t data;
	};
	auto unnamedRegion = std::make_unique<boost::interprocess::mapped_region>(
			boost::interprocess::anonymous_shared_memory(512*1024));
	auto anonymousShm = std::make_unique<boost::interprocess::managed_external_buffer>(
			boost::interprocess::create_only, unnamedRegion->get_address(), unnamedRegion->get_size());

	auto result = anonymousShm->find_or_construct<TestData>("test"); //kaboom
	ASSERT_NE(nullptr, result.operator()());
}

That is the output:

[----------] 1 test from SharedMemoryManagerTest
[ RUN      ] SharedMemoryManagerTest.PlainTest
Start  foo: SharedMemoryManagerTest.PlainTest
Test  #foo: SharedMemoryManagerTest.PlainTest
.............................................................................Bus error***Exception:   1.28 sec

Tested on other platforms x86, 32&64Bit (Win/Linux) without any issues.

I thought it might be due to segment_manager.hpp priv_generic_named_construct(...) there is an allocate performed and not allocate_aligned despite having the info in block_info.m_value_alignment available.