C11 added `_Alignas`, and it looks like C++11 has `alignas`, so you don't need to rely on vendor-specific extensions for alignment, unless the JVM restricts its

C11 added `_Alignas`, and it looks like C++11 has `alignas`, so you don't need to rely on vendor-specific extensions for alignment, unless the JVM restricts itself to an earlier standard. LEVEL1_DCACHE_LINESIZE looks to be specific to Linux and Solaris, however.