kbuild: move flex and bison rules to Makefile.host
Flex and bison are used for kconfig, dtc, genksyms, all of which are
host programs. I never imagine the kernel embeds a parser or a lexer.
Move the flex and bison rules to scripts/Makefile.host. This file is
included only when hostprogs-y etc. is present in the Makefile in the
directory. So, parsing these rules are skipped in most of directories.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/scripts/Makefile.host b/scripts/Makefile.host
index 2208ebb..b402c61 100644
--- a/scripts/Makefile.host
+++ b/scripts/Makefile.host
@@ -1,4 +1,21 @@
# SPDX-License-Identifier: GPL-2.0
+
+# LEX
+# ---------------------------------------------------------------------------
+quiet_cmd_flex = LEX $@
+ cmd_flex = $(LEX) -o$@ -L $<
+
+$(obj)/%.lex.c: $(src)/%.l FORCE
+ $(call if_changed,flex)
+
+# YACC
+# ---------------------------------------------------------------------------
+quiet_cmd_bison = YACC $(basename $@).[ch]
+ cmd_bison = $(YACC) -o $(basename $@).c --defines=$(basename $@).h -t -l $<
+
+$(obj)/%.tab.c $(obj)/%.tab.h: $(src)/%.y FORCE
+ $(call if_changed,bison)
+
# ==========================================================================
# Building binaries on the host system
# Binaries are used during the compilation of the kernel, for example
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 67d1165..49d20f3 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -187,22 +187,6 @@
$(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
endef
-# LEX
-# ---------------------------------------------------------------------------
-quiet_cmd_flex = LEX $@
- cmd_flex = $(LEX) -o$@ -L $<
-
-$(obj)/%.lex.c: $(src)/%.l FORCE
- $(call if_changed,flex)
-
-# YACC
-# ---------------------------------------------------------------------------
-quiet_cmd_bison = YACC $(basename $@).[ch]
- cmd_bison = $(YACC) -o $(basename $@).c --defines=$(basename $@).h -t -l $<
-
-$(obj)/%.tab.c $(obj)/%.tab.h: $(src)/%.y FORCE
- $(call if_changed,bison)
-
# Shipped files
# ===========================================================================