Commit 833e6224 authored by Masahiro Yamada's avatar Masahiro Yamada
Browse files

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: default avatarMasahiro Yamada <yamada.masahiro@socionext.com>
parent 9a8dfb39

scripts/Makefile.lib

+3 −21
Original line number Diff line number Diff line
@@ -184,14 +184,8 @@ endef 
quiet_cmd_flex = LEX     $@

      cmd_flex = $(LEX) -o$@ -L $<



ifdef REGENERATE_PARSERS

.PRECIOUS: $(src)/%.lex.c_shipped

$(src)/%.lex.c_shipped: $(src)/%.l

	$(call cmd,flex)

endif



.PRECIOUS: $(obj)/%.lex.c

$(filter %.lex.c,$(targets)): $(obj)/%.lex.c: $(src)/%.l FORCE

$(obj)/%.lex.c: $(src)/%.l FORCE

	$(call if_changed,flex)



# YACC
@@ -199,27 +193,15 @@ $(filter %.lex.c,$(targets)): $(obj)/%.lex.c: $(src)/%.l FORCE 
quiet_cmd_bison = YACC    $@

      cmd_bison = $(YACC) -o$@ -t -l $<



ifdef REGENERATE_PARSERS

.PRECIOUS: $(src)/%.tab.c_shipped

$(src)/%.tab.c_shipped: $(src)/%.y

	$(call cmd,bison)

endif



.PRECIOUS: $(obj)/%.tab.c

$(filter %.tab.c,$(targets)): $(obj)/%.tab.c: $(src)/%.y FORCE

$(obj)/%.tab.c: $(src)/%.y FORCE

	$(call if_changed,bison)



quiet_cmd_bison_h = YACC    $@

      cmd_bison_h = bison -o/dev/null --defines=$@ -t -l $<



ifdef REGENERATE_PARSERS

.PRECIOUS: $(src)/%.tab.h_shipped

$(src)/%.tab.h_shipped: $(src)/%.y

	$(call cmd,bison_h)

endif



.PRECIOUS: $(obj)/%.tab.h

$(filter %.tab.h,$(targets)): $(obj)/%.tab.h: $(src)/%.y FORCE

$(obj)/%.tab.h: $(src)/%.y FORCE

	$(call if_changed,bison_h)



# Shipped files

scripts/genksyms/Makefile

+27 −0
Original line number Diff line number Diff line
@@ -5,9 +5,36 @@ always := $(hostprogs-y) 


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

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