Optimize for lexer performance: stop backtracking.

[cycript.git] / Makefile.am

diff --git a/Makefile.am b/Makefile.am
index ee3b63bd474def88b6e94dc951ebc8ca59483ddf..76f44b2aaf30ceb8be6e2d70e5ba05648fff4d36 100644 (file)
--- a/Makefile.am
+++ b/Makefile.am
@@ -99,7 +99,8 @@ Cycript.l: Cycript.l.in
 
 CLEANFILES += lex.cy.cpp
 lex.cy.cpp: Cycript.l
-       $(FLEX) -t $< | $(SED) -e 's/int yyl;/yy_size_t yyl;/;s/int yyleng_r;/yy_size_t yyleng_r;/' >$@
+       $(FLEX) -b -t $< | $(SED) -e 's/int yyl;/yy_size_t yyl;/;s/int yyleng_r;/yy_size_t yyleng_r;/;s/yyg =/yyg __attribute__((__unused__)) =/' >$@
+       grep -F 'No backing up.' lex.backup >/dev/null
 
 Console.$(OBJEXT) Cycript.tab.lo Driver.lo Handler.lo Highlight.lo Library.lo lex.cy.lo: Cycript.tab.hh