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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/106572] A programmatic list of all possible compiler warnings
Date: Tue, 09 Aug 2022 15:14:00 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106572

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #5)
> >which blows up the command line for the compilation.=20
>=20
> You can use a response file and that won't blow up the command line at al=
l.
>=20
> That is:
> g++ -Q --help=3Dwarnings | tail -n +2 | awk '{print $1}' | tr '\n' ' ' >
> cxxflags.opt
>=20
> g++ @cxxflags.opt ....

Oh and you don't need the tr either that is any whitespace in a response fi=
le
is will be treated as a seperator.
So just:
g++ -Q --help=3Dwarnings | tail -n +2 | awk '{print $1}' > cxxflags.opt=