genksyms: generate lexer and parser during build instead of shipping
Now that the kernel build supports flex and bison, remove the _shipped
files and generate them during the build instead.
There are no more shipped lexer and parser, so I ripped off the rules
in scripts/Malefile.lib that were used for REGENERATE_PARSERS.
The genksyms parser has ambiguous grammar, which would emit warnings:
scripts/genksyms/parse.y: warning: 9 shift/reduce conflicts [-Wconflicts-sr]
scripts/genksyms/parse.y: warning: 5 reduce/reduce conflicts [-Wconflicts-rr]
They are normally suppressed, but displayed when W=1 is given.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/scripts/genksyms/Makefile b/scripts/genksyms/Makefile
index 0ccac51..a9565eb 100644
--- a/scripts/genksyms/Makefile
+++ b/scripts/genksyms/Makefile
@@ -5,9 +5,36 @@
genksyms-objs := genksyms.o parse.tab.o lex.lex.o
+# FIXME: fix the ambiguous grammar in parse.y and delete this hack
+#
+# Suppress shift/reduce, reduce/reduce conflicts warnings
+# unless W=1 is specified.
+#
+# Just in case, run "$(YACC) --version" without suppressing stderr
+# so that 'bison: not found' will be displayed if it is missing.
+ifeq ($(findstring 1,$(KBUILD_ENABLE_EXTRA_GCC_CHECKS)),)
+
+quiet_cmd_bison_no_warn = $(quet_cmd_bison)
+ cmd_bison_no_warn = $(YACC) --version >/dev/null; \
+ $(cmd_bison) 2>/dev/null
+
+$(obj)/parse.tab.c: $(src)/parse.y FORCE
+ $(call if_changed,bison_no_warn)
+
+quiet_cmd_bison_h_no_warn = $(quet_cmd_bison_h)
+ cmd_bison_h_no_warn = $(YACC) --version >/dev/null; \
+ $(cmd_bison_h) 2>/dev/null
+
+$(obj)/parse.tab.h: $(src)/parse.y FORCE
+ $(call if_changed,bison_h_no_warn)
+
+endif
+
# -I needed for generated C source (shipped source)
HOSTCFLAGS_parse.tab.o := -I$(src)
HOSTCFLAGS_lex.lex.o := -I$(src)
# dependencies on generated files need to be listed explicitly
$(obj)/lex.lex.o: $(obj)/parse.tab.h
+
+targets := lex.lex.c parse.tab.c parse.tab.h