PDP-8 assemblers - Re: PDP-8 Unix

On Sat, Feb 18, 2012 at 4:28 PM, Toby Thain <toby at telegraphics.com.au> wrote: Hi, Toby, I tried to build this on my Ubuntu 11.04 laptop and it did not go well. I installed flex 2.5.35, and bison 2.4.1, and I'm using gcc 4.5.2 (all installed from packages). Here's what I'm getting... $ make cc -O2 -W -Wall -I. -c -o main.o main.c cc -O2 -W -Wall -I. -c -o str.o str.c cc -O2 -W -Wall -I. -c -o error.o error.c cc -O2 -W -Wall -I. -c -o assign.o assign.c cc -O2 -W -Wall -I. -c -o symtab.o symtab.c cc -O2 -W -Wall -I. -c -o object.o object.c cc -O2 -W -Wall -I. -c -o gpl.o gpl.c cc -O2 -W -Wall -I. -c -o list.o list.c bison -y -d pdp8/parser.y mv y.tab.c pdp8/parser.tab.c mv y.tab.h pdp8/parser.tab.h flex -t pdp8/lexer.l > pdp8/lexer.c cc -O2 -W -Wall -I. -c -o pdp8/lexer.o pdp8/lexer.c <stdout>:1180:17: warning: ?yyunput? defined but not used <stdout>:1221:16: warning: ?input? defined but not used cc -O2 -W -Wall -I. -c -o pdp8/parser.tab.o pdp8/parser.tab.c pdp8/parser.y:25:20: error: ?TOK_SYM? undeclared here (not in a function) y.tab.c: In function ?yyparse?: y.tab.c:1339:7: warning: implicit declaration of function ?yylex? make: *** [pdp8/parser.tab.o] Error 1 rm pdp8/lexer.c I've been building programs from source on UNIX for a long time, but I never really got a handle on how to debug problems in lex/yacc files. Any suggestions? The README mentions several environments where it was successfully built and tested. Could this be a tool-chain version problem? I see your pointer to getting 'flex' points to a presently-non-existent page on the gnu.org website (the current page is on the FSF wiki at http://directory.fsf.org/wiki/Flex), so it makes me wonder if there haven't been "improvements" in flex that are not backwards compatible with older sources. Thanks for any tips. I'd love to get a working cross-assembler environment going. -ethan