[dunfell][PATCH] make-mod-scripts: add HOSTCXX definitions and gmp-native dependency

From: Bruce Ashfield <redacted>

With kernel v5.8+ and gcc10 plugins, we can run into the following build error:

      HOSTCXX -fPIC scripts/gcc-plugins/arm_ssp_per_task_plugin.o
    In file included from
    /home/pokybuild/yocto-worker/qemuarm/build/build/tmp/work/qemuarm-poky-linux-gnueabi/make-mod-scripts/1.0-r0/recipe-sysroot-native/usr/bin/arm-poky-linux-gnueabi/../../lib/arm-poky-linux-gnueabi/gcc/arm-poky-linux-gnueabi/10.1.0/plugin/include/gcc-plugin.h:28,
                     from
    /home/pokybuild/yocto-worker/qemuarm/build/build/tmp/work-shared/qemuarm/kernel-source/scripts/gcc-plugins/gcc-common.h:7,
                     from
    /home/pokybuild/yocto-worker/qemuarm/build/build/tmp/work-shared/qemuarm/kernel-source/scripts/gcc-plugins/arm_ssp_per_task_plugin.c:3:
    /home/pokybuild/yocto-worker/qemuarm/build/build/tmp/work/qemuarm-poky-linux-gnueabi/make-mod-scripts/1.0-r0/recipe-sysroot-native/usr/bin/arm-poky-linux-gnueabi/../../lib/arm-poky-linux-gnueabi/gcc/arm-poky-linux-gnueabi/10.1.0/plugin/include/system.h:687:10:
    fatal error: gmp.h: No such file or directory
      687 | #include <gmp.h>
          |          ^~~~~~~

Signed-off-by: Bruce Ashfield <redacted>
Signed-off-by: Richard Purdie <redacted>
(cherry picked from commit cb055446e0fe4771c8bd6122e79d43ef8db2e45b)
---
 meta/recipes-kernel/make-mod-scripts/make-mod-scripts_1.0.bb | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/meta/recipes-kernel/make-mod-scripts/make-mod-scripts_1.0.bb b/meta/recipes-kernel/make-mod-scripts/make-mod-scripts_1.0.bb
index 87b7d240f5..b58fa9a603 100644
--- a/meta/recipes-kernel/make-mod-scripts/make-mod-scripts_1.0.bb
+++ b/meta/recipes-kernel/make-mod-scripts/make-mod-scripts_1.0.bb

@@ -16,8 +16,10 @@ do_compile[depends] += "virtual/kernel:do_compile_kernelmodules"
 RDEPENDS_${PN}-dev = ""
 
 DEPENDS += "bc-native bison-native"
+DEPENDS += "gmp-native"
 
 EXTRA_OEMAKE = " HOSTCC="${BUILD_CC} ${BUILD_CFLAGS} ${BUILD_LDFLAGS}" HOSTCPP="${BUILD_CPP}""
+EXTRA_OEMAKE += " HOSTCXX="${BUILD_CXX} ${BUILD_CXXFLAGS} ${BUILD_LDFLAGS}""
 
 # Build some host tools under work-shared.  CC, LD, and AR are probably
 # not used, but this is the historical way of invoking "make scripts".

-- 
2.30.2