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build: Bump minimum supported GCC to g++-9
Also, update the code to use constexpr, which does not work in g++-8. Also, drop the no longer needed build-aux/m4/l_filesystem.m4.
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@ -115,9 +115,6 @@ else
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AX_CXX_COMPILE_STDCXX([20], [noext], [mandatory])
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fi
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dnl check if additional link flags are required for std::filesystem
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CHECK_FILESYSTEM
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dnl Unless the user specified OBJCXX, force it to be the same as CXX. This ensures
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dnl that we get the same -std flags for both.
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m4_ifdef([AC_PROG_OBJCXX],[
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