Kbuild fixes for v5.11

- Search for <ncurses.h> in the default header path of HOSTCC
 
  - Tweak the option order to be kind to old BSD awk
 
  - Remove 'kvmconfig' and 'xenconfig' shorthands
 
  - Fix documentation
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Merge tag 'kbuild-fixes-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild fixes from Masahiro Yamada:

 - Search for <ncurses.h> in the default header path of HOSTCC

 - Tweak the option order to be kind to old BSD awk

 - Remove 'kvmconfig' and 'xenconfig' shorthands

 - Fix documentation

* tag 'kbuild-fixes-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
  Documentation: kbuild: Fix section reference
  kconfig: remove 'kvmconfig' and 'xenconfig' shorthands
  lib/raid6: Let $(UNROLL) rules work with macOS userland
  kconfig: Support building mconf with vendor sysroot ncurses
  kconfig: config script: add a little user help
  MAINTAINERS: adjust GCC PLUGINS after gcc-plugin.sh removal

Documentation/kbuild/makefiles.rst

@@ -598,7 +598,7 @@ more details, with real examples.
 	explicitly added to $(targets).
 
 	Assignments to $(targets) are without $(obj)/ prefix. if_changed may be
-	used in conjunction with custom rules as defined in "3.9 Custom Rules".
+	used in conjunction with custom rules as defined in "3.11 Custom Rules".
 
 	Note: It is a typical mistake to forget the FORCE prerequisite.
 	Another common pitfall is that whitespace is sometimes significant; for

MAINTAINERS

@@ -7363,7 +7363,6 @@ L:	linux-hardening@vger.kernel.org
 S:	Maintained
 F:	Documentation/kbuild/gcc-plugins.rst
 F:	scripts/Makefile.gcc-plugins
-F:	scripts/gcc-plugin.sh
 F:	scripts/gcc-plugins/
 
 GCOV BASED KERNEL PROFILING

lib/raid6/Makefile

@@ -48,7 +48,7 @@ endif
 endif
 
 quiet_cmd_unroll = UNROLL  $@
-      cmd_unroll = $(AWK) -f$(srctree)/$(src)/unroll.awk -vN=$* < $< > $@
+      cmd_unroll = $(AWK) -v N=$* -f $(srctree)/$(src)/unroll.awk < $< > $@
 
 targets += int1.c int2.c int4.c int8.c int16.c int32.c
 $(obj)/int%.c: $(src)/int.uc $(src)/unroll.awk FORCE

scripts/config

@@ -223,6 +223,7 @@ while [ "$1" != "" ] ; do
 		;;
 
 	*)
+		echo "bad command: $CMD" >&2
 		usage
 		;;
 	esac

scripts/kconfig/Makefile

@@ -94,16 +94,6 @@ configfiles=$(wildcard $(srctree)/kernel/configs/$@ $(srctree)/arch/$(SRCARCH)/c
 	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh -m .config $(configfiles)
 	$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
 
-PHONY += kvmconfig
-kvmconfig: kvm_guest.config
-	@echo >&2 "WARNING: 'make $@' will be removed after Linux 5.10"
-	@echo >&2 "         Please use 'make $<' instead."
-
-PHONY += xenconfig
-xenconfig: xen.config
-	@echo >&2 "WARNING: 'make $@' will be removed after Linux 5.10"
-	@echo >&2 "         Please use 'make $<' instead."
-
 PHONY += tinyconfig
 tinyconfig:
 	$(Q)$(MAKE) -f $(srctree)/Makefile allnoconfig tiny.config

scripts/kconfig/mconf-cfg.sh

@@ -33,7 +33,9 @@ if [ -f /usr/include/ncurses/ncurses.h ]; then
 	exit 0
 fi
 
-if [ -f /usr/include/ncurses.h ]; then
+# As a final fallback before giving up, check if $HOSTCC knows of a default
+# ncurses installation (e.g. from a vendor-specific sysroot).
+if echo '#include <ncurses.h>' | "${HOSTCC}" -E - >/dev/null 2>&1; then
 	echo cflags=\"-D_GNU_SOURCE\"
 	echo libs=\"-lncurses\"
 	exit 0