autoconf is acceptable to deal with very legacy compilers?

[mpsuzuki]

Hi!
Before all, I appreciate your implementation of xxHash with plain C90 & C++98, thank you very much, it's very helpful to use xxHash in the legacy environment!!

I have a question, "autoconf is acceptable workaround for this project to deal with the legacy compilers?" In my case, I want to use the compiler GCC-4.6, which does not have "-Wpedantic" option. It might be possible for me to write a small checking by autoconf, to check the available options, and rewrite Makefile appropriately.

But I'm afraid this project is designed to be very simple (so Makefile checks gcc-or-clang by shell command in Makefile), and it might be the way you dislike. Please could you tell me whether there is any acceptable workaround for you?