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tools/m4: Case to allow C++20 without error.

This commit is contained in:
Jason Volk 2020-05-10 18:07:17 -07:00
parent 083cd73eb8
commit b5e1446510

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@ -48,6 +48,7 @@ AC_DEFUN([AX_CXX_COMPILE_STDCXX], [dnl
m4_if([$1], [11], [],
[$1], [14], [],
[$1], [17], [],
[$1], [20], [],
[m4_fatal([invalid first argument `$1' to AX_CXX_COMPILE_STDCXX])])dnl
m4_if([$2], [], [],
[$2], [gnu], [],