c++ - How do I tell which version of g++ is the earliest version that uses `atomic` instead of `cstdatomic`? -

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i have 1 system runs g++ 4.4.7 , supports #include <cstdatomic>. have system runs g++ 4.9.1 , supports #include <atomic>.

how can discover earliest version of g++ supports <atomic>, or conversely latest version of g++ supports <cstdatomic>, without building compilers , doing manual search?

more broadly, how can answer question arbitrary system header x?

there gcc git mirror these things. <cstdatomic> first appears in april 2008 this commit , disappears in december 2009 this one. far can tell, <atomic> appears in same commit. looking @ tags, latter round time when gcc 4.5 released, , sure enough, browsing through source trees, <cstdatomic> disappears 4.5 (but kept in later 4.4 releases) , <atomic> appears in place.

addendum: place in source tree libstdc++v3/include/. <cstdatomic> in c_global, <atomic> in std.


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