[Buildroot] [PATCH] traceroute: fix 'no rule to make target -lm' error

[Thomas Petazzoni <thomas.petazzoni@bootlin.com>]

Hello,

On Thu, 18 Oct 2018 19:37:21 -0300, Sergio Prado wrote:
> Fix the following build error:
> 
> make[3]: *** No rule to make target '-lm', needed by 'traceroute'.
> 
> Fixes:
> http://autobuild.buildroot.org/results/dde63672e1de1d4ba036331ab127ccc8ff044444
> http://autobuild.buildroot.org/results/4efb67e6a29c3dd784676d30a1051f9f0c2a6c80
> http://autobuild.buildroot.org/results/7ac23a3959aec22297695899c0f76dbbc4e114d3
> And many more...
> 
> Signed-off-by: Sergio Prado <sergio.prado@e-labworks.com>
> ---
>  package/traceroute/traceroute.mk | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/package/traceroute/traceroute.mk b/package/traceroute/traceroute.mk
> index 192197498df7..a02982a6b5f0 100644
> --- a/package/traceroute/traceroute.mk
> +++ b/package/traceroute/traceroute.mk
> @@ -11,7 +11,7 @@ TRACEROUTE_LICENSE = GPL-2.0+, LGPL-2.1+
>  TRACEROUTE_LICENSE_FILES = COPYING COPYING.LIB
>  
>  define TRACEROUTE_BUILD_CMDS
> -	$(TARGET_MAKE_ENV) $(MAKE) $(TARGET_CONFIGURE_OPTS) \
> +	$(TARGET_MAKE_ENV) VPATH=$(STAGING_DIR)/usr/lib $(MAKE) $(TARGET_CONFIGURE_OPTS) \
>  		CFLAGS="$(TARGET_CFLAGS) -D_GNU_SOURCE" -C $(@D)

We briefly discussed this patch during the Buildroot Developers
meeting, and setting VPATH clearly cannot be the right solution, it's a
big hack. A better solution needs to be found :)

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com