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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/97308] OpenBSD bootstrap fails with error: C++
 preprocessor "/lib/cpp" fails sanity check
Date: Tue, 06 Oct 2020 17:41:34 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97308

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The /lib/cpp error is a bit misleading, because that's the last thing it tr=
ies
to find as a C++ compiler, after exhausting g++ -std=3Dc++11 and various ot=
her
options that fail with:

configure:19863: g++ -std=3Dc++11 -E  conftest.cpp
cc1plus: error: unrecognized command line option "-std=3Dc++11"

As stated in the install docs, you need a C++11 compiler, and the system GC=
C on
OpenBSD probably doesn't recognise the -std=3Dc++11 option. This is not a b=
ug.=