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From: "unlvsur at live dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/100017] [11/12 regression] error: 'fenv_t' has not
 been declared in '::' -- canadian compilation fails
Date: Thu, 06 Jan 2022 22:41:29 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100017

--- Comment #73 from cqwrteur <unlvsur at live dot com> ---
(In reply to Jakub Jelinek from comment #72)
> Guess another option would be to do that
> RAW_CXX_FLAGS_FOR_TARGET=3D"$RAW_CXX_FLAGS_FOR_TARGET -nostdinc++"
> in the toplevel configure.ac after all the GCC_TARGET_TOOL lines.
> While GCC_TARGET_TOOL does AC_SUBST on the second argument, so
> AC_SUBST(RAW_CXX_FLAGS_FOR_TARGET), in autoconf AC_SUBST just remembers
> that it should be substituted and does the substitutions late, so when the
> var is changed in between it will propagate to the Makefiles etc.
>=20
> --- configure.ac	2022-01-04 23:11:22.153595595 +0100
> +++ configure.ac	2022-01-06 21:59:49.274985505 +0100
> @@ -3669,6 +3669,8 @@ GCC_TARGET_TOOL(strip, STRIP_FOR_TARGET,
>  GCC_TARGET_TOOL(windres, WINDRES_FOR_TARGET, WINDRES, [binutils/windres])
>  GCC_TARGET_TOOL(windmc, WINDMC_FOR_TARGET, WINDMC, [binutils/windmc])
>=20=20
> +RAW_CXX_FOR_TARGET=3D"$RAW_CXX_FOR_TARGET -nostdinc++"
> +
>  AC_SUBST(FLAGS_FOR_TARGET)
>  AC_SUBST(RAW_CXX_FOR_TARGET)
>=20=20
>=20
> completely untested...

Also. Can I propose another patch that fixes multilib canadian builds for
mingw-w64 and cygwin? i think I have a patch to fix that.

The build sripts in GCC copy wrong DLLs when we build multilibs when we bui=
ld
Canadians. It is also a problem for native but native is usually buggy that
cannot build multilibs.=