[Buildroot] [PATCH v2 1/3] toolchain: workaround musl/kernel headers conflict

[Thomas Petazzoni]

Hello,

On Thu, 18 May 2017 14:17:44 +0300, Baruch Siach wrote:

> Would that be better (untested)?
> 
> diff --git a/toolchain/toolchain/toolchain.mk b/toolchain/toolchain/toolchain.mk
> index e29837357a27..e15ceeb426fa 100644
> --- a/toolchain/toolchain/toolchain.mk
> +++ b/toolchain/toolchain/toolchain.mk
> @@ -21,8 +21,10 @@ TOOLCHAIN_ADD_TOOLCHAIN_DEPENDENCY = NO
>  # IFF_DORMANT and IFF_ECHO, add another macro to suppress them in the
>  # kernel header, and avoid macro/enum conflict.
>  #
> +# Kernel version 3.12 introduced the libc-compat.h header.
> +#
>  # [1] http://www.openwall.com/lists/musl/2015/10/08/2
> -ifeq ($(BR2_TOOLCHAIN_USES_MUSL),y)
> +ifeq ($(BR2_TOOLCHAIN_USES_MUSL)$(BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_12),yy)
>  define TOOLCHAIN_MUSL_KERNEL_HEADERS_COMPATIBILITY_HACK
>  	$(SED) 's/^#if defined(__GLIBC__)$$/#if 1/' \
>  		$(STAGING_DIR)/usr/include/linux/libc-compat.h

Yes. The question is whether we will see those build failures due to
kernel/userspace headers conflicts. Do you remember a simple
package/scenario that triggers the problem?

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com