On 06/15/2012 03:19 PM, Timothy Madden wrote:
> Hello
>
> Can automake use flex and bison to generate .cc files from lexer.ll and
> parser.yy files ?
>
Yes (with some limitations in the use of more advanced Bison features, sadly).
> I currently get this error from the make command:
>
> [adrian@adrian code-formatter]$ make
> /bin/sh ./ylwrap code-formatter.ll lex.yy.c code-formatter.cc \
> -- flex
>
> make: *** [code-formatter.cc] Error 1
> [adrian@adrian code-formatter]$
>
> I am new to automake and as you can see the message really doesn't tell me
> anything about what is going wrong.
>
> This is my Makefile.am:
>
> bin_PROGRAMS=code-formatter
> code_formatter_SOURCES=code-formatter.ll code-formatter.yy
>
This is wrong: it means the Automake-generated rules will try to generate
'code-formatter.cc' from both 'code-formatter.ll' and 'code-formatter.yy'.
Chaos will ensue.
You should use something like this instead:
bin_PROGRAMS = code-formatter
code_formatter_SOURCES = lexer.ll parser.yy
In case this suggestion doesn't solve your problem, please answer the
following questions (the details you've given would be too few for us
to attempt a proper diagnosis otherwise):
- Which automake version are you using?
- Which ylwrap version exactly?
- On which system you are on?
- What flex version are you using?
- How do the relevant parts of the generated Makefile.in appear?
(You can find this with "grep -C4 ylwrap Makefile.in").
Also, if you run this commands after the failure above:
$ ls -la
$ /bin/sh -x ./ylwrap code-formatter.ll lex.yy.c code-formatter.cc -- flex
$ ls -la
what is their output?
> Am I missing something ? Do I need to write explicit makefile
> rules to use the C++ interface ?
>
> Thank you,
> Timothy Madden
>
>
HTH,
Stefano
