From 833e622459432ed5bc7cc58ffadb91b59c863a3a Mon Sep 17 00:00:00 2001 From: Masahiro Yamada Date: Fri, 23 Mar 2018 22:04:32 +0900 Subject: 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 --- scripts/genksyms/Makefile | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) (limited to 'scripts/genksyms/Makefile') diff --git a/scripts/genksyms/Makefile b/scripts/genksyms/Makefile index 0ccac515a8d8..a9565eb6a292 100644 --- a/scripts/genksyms/Makefile +++ b/scripts/genksyms/Makefile @@ -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 -- cgit v1.2.3