[Buildroot] [PATCH] package/exim: Fix compilation error with musl

[Yann E. MORIN <yann.morin.1998@free.fr>]

Luca, Bernd, All,

On 2015-07-25 15:36 +0200, Luca Ceresoli spake thusly:
> From: Bernd Kuhls <bernd.kuhls@t-online.de>
> 
> Fixes
> smtp_in.c: In function ?smtp_start_session?:
> smtp_in.c:1976:36: error: invalid application of ?sizeof? to incomplete type ?struct options?
>      EXIM_SOCKLEN_T optlen = sizeof(struct ip_options) + MAX_IPOPTLEN;
> 
> smtp_in.c misdetects the needed style for ip_options, only OPTSTYLE == 2 works.
> Since musl does not provide any macro[1] to detect it we need to pretend to be
> darwin in order to fix the compile bug.
> 
> [1] http://wiki.musl-libc.org/wiki/FAQ#Q:_why_is_there_no_MUSL_macro_.3F
> 
> Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
> [Luca: simplify by using only one sed invocation]
> Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>

Tested-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
[yann.morin.1998 at free.fr: build-tested only]
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

Regards,
Yann E. MORIN.

> ---
> 
> I'm adopting this oldish patch (https://patchwork.ozlabs.org/patch/460496/)
> from Bernd. The bug it fixes is still there, and the fix is still valid. I
> just simplified it according to my comments to the original patch.
> 
> Changes v1 -> v2:
>  - simplify by using only one sed invocation (Luca).
> ---
>  package/exim/exim.mk | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/package/exim/exim.mk b/package/exim/exim.mk
> index ed6a30997215..002ffd294fd8 100644
> --- a/package/exim/exim.mk
> +++ b/package/exim/exim.mk
> @@ -80,6 +80,15 @@ define EXIM_REMOVE_LIBNSL_FROM_MAKEFILE
>  endef
>  endif
>  
> +# musl does not provide struct ip_options nor struct ip_opts (but it is
> +# available with both glibc and uClibc)
> +ifeq ($(BR2_TOOLCHAIN_USES_MUSL),y)
> +define EXIM_FIX_IP_OPTIONS_FOR_MUSL
> +	$(SED) 's/#define GLIBC_IP_OPTIONS/#define DARWIN_IP_OPTIONS/' \
> +		$(@D)/OS/os.h-Linux
> +endef
> +endif
> +
>  define EXIM_CONFIGURE_TOOLCHAIN
>  	$(call exim-config-add,CC,$(TARGET_CC))
>  	$(call exim-config-add,CFLAGS,$(TARGET_CFLAGS))
> @@ -88,6 +97,7 @@ define EXIM_CONFIGURE_TOOLCHAIN
>  	$(call exim-config-add,HOSTCC,$(HOSTCC))
>  	$(call exim-config-add,HOSTCFLAGS,$(HOSTCFLAGS))
>  	$(EXIM_REMOVE_LIBNSL_FROM_MAKEFILE)
> +	$(EXIM_FIX_IP_OPTIONS_FOR_MUSL)
>  endef
>  
>  ifneq ($(call qstrip,$(BR2_PACKAGE_EXIM_CUSTOM_CONFIG_FILE)),)
> -- 
> 1.9.1
> 
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