Converting from old sun4 lex and yacc to flex and bison on Linux

[Laura E Fowler]

I'm now responsible for some old code
(> 10 years old) that is used to generate documentation and header files.
It uses lex and yacc and currently is compiled and run on an  old
sun4 system. I'm trying to compile it and run it on a Linux system (SGI
Altix). 

Firstly, I'm not conversant in lex and
yacc, so please be gentle. Basically, I needs some pointers in the right
direction.

I have gotten the code to compile and
run. I managed to correct all of the warning and I also used the -l option
when using flex. The resulting tool seems to work fairly well except for
one major problem. The files used as input to this tool can include other
 files and when an include statement is read, that file should be
opened and processed before continuing on with the rest of the current
file. The problem is that when an include statement is read, the file is
opened and put on a linked list, but not processed. When end of file is
reached on the initial file, then the files are popped off of the linked
list and processed. This results in them being processed in the wrong order.
On the sun4, the files are processed in the correct order.

Can anyone give me any hints of where
to look to figure out why the included file is not being processed after
it's opened.  Also, some hints on how to debug the flex and bison
code would be appreciated.

I tried searching the archives, but
didn't come up with anything that would help.

Please let me know if you need more
information.

Thanks,

Laura