[Buildroot] [PATCH] package/glibc: disable Werror for gcc 10 build

[Yegor Yefremov]

On Sun, Jun 28, 2020 at 10:16 PM Romain Naour <romain.naour at gmail.com> wrote:
>
> Currently glibc 2.30 is build by default with Werror enabled but it
> has only been tested with compiler version available at the time of
> the release [1] (gcc 6.2 up to gcc 9.2.1). It's recommended to use
> those version with glibc 2.30.
>
> For the same reason why we remove Werror in packages's compiler
> flags. Building with Werror is not bulletproof when we start
> using a newer compiler that introduce new warnings.
> This is the case here with gcc 10, as reported by Yegor Yefremov
> [2].
>
> Fixing compiler warnings would require backporting many patches [3]
> not even backported by Glibc maintainers to the 2.30 stable
> branch. Instead, disable Werror by using --disable-werror.
> Most (if not all) gcc 10 warnings will be fixed with Glibc 2.31.
>
> [1] https://sourceware.org/git/?p=glibc.git;a=blob;f=INSTALL;h=62e78725f57080a1cb638cccd28ca3c2ffc5a22c#l466
> [2] http://lists.busybox.net/pipermail/buildroot/2020-June/285715.html
> [3] https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=cba932a5a9e91cffd7f4172d7e91f9b2efb1f84b
>     https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=de18a7061c9bdff73d66502c55d6a3ea671fc6d9
>     https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=49348beafe9ba150c9bd48595b3f372299bddbb0
>     https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=70c6e15654928c603c6d24bd01cf62e7a8e2ce9b
>     https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=c7bf5ceab6ec776ac7350d3b0190776bf532ac54
>     https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=e1d559f337de2c8ab68a6749dfe873477c883807
>
> Signed-off-by: Romain Naour <romain.naour at gmail.com>
> Cc: Yegor Yefremov <yegorslists at googlemail.com>

Tested-by: Yegor Yefremov <yegorslists at googlemail.com>

> ---
>  package/glibc/glibc.mk | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/package/glibc/glibc.mk b/package/glibc/glibc.mk
> index 76fae1f9f7..1881cf0cdc 100644
> --- a/package/glibc/glibc.mk
> +++ b/package/glibc/glibc.mk
> @@ -131,6 +131,7 @@ define GLIBC_CONFIGURE_CMDS
>                 $(if $(BR2_x86_64),--enable-lock-elision) \
>                 --with-pkgversion="Buildroot" \
>                 --disable-profile \
> +               --disable-werror \
>                 --without-gd \
>                 --enable-obsolete-rpc \
>                 --enable-kernel=$(call qstrip,$(BR2_TOOLCHAIN_HEADERS_AT_LEAST)) \
> --
> 2.25.4
>