[OE-core] [PATCH] kernel.bbclass: set HOSTLDFLAGS in KCONFIG_CONFIG_COMMAND

[California Sullivan]

Kernel v4.14 and newer contain the following in their Makefile:

HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS)
HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS)

This breaks our menuconfig, because it can no longer find ncurses if its
not on the host machine. This can be seen in linux-yocto-dev, for
example:

[clsulliv at clsulliv build]$ bitbake virtual/kernel -c menuconfig

  GEN     ./Makefile
  HOSTLD  scripts/kconfig/mconf
/home/clsulliv/yocto/poky/build/tmp/hosttools/ld: cannot find -lncurses
/home/clsulliv/yocto/poky/build/tmp/hosttools/ld: cannot find -ltinfo
collect2: error: ld returned 1 exit status
make[3]: *** [scripts/Makefile.host:99: scripts/kconfig/mconf] Error 1
make[2]: *** [/home/clsulliv/yocto/poky/build/tmp/work-shared/intel-corei7-64/kernel-source/Makefile:504: menuconfig] Error 2
make[1]: *** [Makefile:146: sub-make] Error 2
make: *** [Makefile:24: __sub-make] Error 2
Command failed.
Press any key to continue...

Fix this by setting HOSTLDFLAGS to ${BUILD_LDFLAGS} in our
'make menuconfig' command.

Signed-off-by: California Sullivan <california.l.sullivan at intel.com>
---
 meta/classes/kernel.bbclass | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass
index 2f6eca382e9..e4df1531c19 100644
--- a/meta/classes/kernel.bbclass
+++ b/meta/classes/kernel.bbclass
@@ -531,6 +531,8 @@ addtask savedefconfig after do_configure
 
 inherit cml1
 
+KCONFIG_CONFIG_COMMAND_append = " HOSTLDFLAGS='${BUILD_LDFLAGS}'"
+
 EXPORT_FUNCTIONS do_compile do_install do_configure
 
 # kernel-base becomes kernel-${KERNEL_VERSION}
-- 
2.14.3