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build: check for C++ 20 and 2b

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C++20 is released.

* configure.ac, m4/bison-cxx-std.m4, tests/atlocal.in,
* tests/local.at: Replace 2a with 20, and add support for 2b.
This commit is contained in:
Akim Demaille
2021-08-12 08:31:38 +02:00
parent db66acc5d0
commit 15ba35a51b
4 changed files with 38 additions and 18 deletions
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configure.ac
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@@ -84,7 +84,8 @@ BISON_CXXSTD([03])
BISON_CXXSTD([11])
BISON_CXXSTD([14])
BISON_CXXSTD([17])
BISON_CXXSTD([2a])
BISON_CXXSTD([20])
BISON_CXXSTD([2b])
AM_CONDITIONAL([ENABLE_CXX11], [test x"$CXX11_CXXFLAGS" != x])
AM_CONDITIONAL([ENABLE_CXX14], [test x"$CXX14_CXXFLAGS" != x])
AC_LANG_POP([C++])