How do I link programs created with flex and bison.

DJ Delorie dj@delorie.com
Tue Dec 22 18:38:00 GMT 1998


Tony Stratton wrote:
> st.tab.obj : error LNK2001: unresolved external symbol _alloca

This is in cygwin1.dll.  As a quick hack, write an alloca() function
that simply calls malloc().  it will leak, but it should work
until you can either find alloca for MSVC, or figure out how to avoid
the call to alloca() in the first place.

> st.tab.obj : error LNK2001: unresolved external symbol _yyerror

You normally need to provide one of these; this is how parse errors
are returned to your program.  libbison.a would provide a dummy
version for you, but it's no big deal to add one to your
program - even right in the .y file.

> libfl.a(libmain.o) : error LNK2001: unresolved external symbol ___main

This is because libfl.a was built with gcc, and provides a default
main(), which expects cygwin's runtime support.  You'll need
to write your own main() function.
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