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Change to C++17?

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christo:
Hi Miguel,

I've been using c++20 for a long time without any issues in my custom branch's  autotools build on ubuntu. I think we can upgrade to c++20 directly.

For autotools, following change should be sufficient : https://github.com/josephch/codeblocks/commit/c56d5feaf0ce0c5d511263d1fba29e3713af68e2

Pecan:
I use wx2.3.8 and wx3.3.3 for CodeBlocks (all compiled at c++20) every day.

Miguel Gimenez:
Should we use gnu++20 or plain c++20?

christo:
I think plain c++20 should be okay as we do not use any gnu specific extensions.

Regarding squirrel warnings, looks like it is fixed upstream by casting : https://github.com/albertodemichelis/squirrel/commit/6ad6f6427157757c4431907dde0a1e5712a5cf67

stahta01:
Remember to update the file from "https://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx.html" in the "m4" folder.

The link above did not work searching found this link "https://github.com/autoconf-archive/autoconf-archive/blob/master/m4/ax_cxx_compile_stdcxx.m4"

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