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From: Jonathan Wakely <jwakely.gcc@gmail.com>
Date: Tue, 31 Aug 2021 10:02:32 +0100
Message-ID: <CAH6eHdQbk7RYp-sq3H0cgvkFkKwpFiporgpABp1NHeG1T_aAnA@mail.gmail.com>
Subject: Re: [PATCH] libstdc++-v3: Check for TLS support on mingw
To: =?UTF-8?Q?Hugo_Beauz=C3=A9e=2DLuyssen?= <hugo@beauzee.fr>
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It looks like my questions about this patch never got an answer, and
it never got applied.

Could somebody say whether TLS is enabled for native *-*-mingw*
builds? If it is, then we definitely need to add GCC_CHECK_TLS to the
cross-compiler config too.

For a linux-hosted x86_64-w64-mingw32 cross compiler I see TLS is not enabl=
ed:

/* Define to 1 if the target supports thread-local storage. */
/* #undef _GLIBCXX_HAVE_TLS */




On Mon, 19 Feb 2018 at 08:59, Hugo Beauz=C3=A9e-Luyssen <hugo@beauzee.fr> w=
rote:
>
> libstdc++-v3: Check for TLS support on mingw
>
> 2018-02-16  Hugo Beauz=C3=A9e-Luyssen  <hugo@beauzee.fr>
>
>     * crossconfig.m4: Check for TLS support on mignw
>     * configure: regenerate
>
> Index: libstdc++-v3/crossconfig.m4
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> --- libstdc++-v3/crossconfig.m4 (revision 257730)
> +++ libstdc++-v3/crossconfig.m4 (working copy)
> @@ -197,6 +197,7 @@ case "${host}" in
>      GLIBCXX_CHECK_LINKER_FEATURES
>      GLIBCXX_CHECK_MATH_SUPPORT
>      GLIBCXX_CHECK_STDLIB_SUPPORT
> +    GCC_CHECK_TLS
>      ;;
>    *-netbsd*)
>      SECTION_FLAGS=3D'-ffunction-sections -fdata-sections'