How does one make a bash "builtin" (shared loadable module) on cygwin
Larry Hall (Cygwin)
Thu May 19 01:24:00 GMT 2011
On 5/18/2011 6:47 PM, Rocky Bernstein wrote:
> I am trying to build a bash "builtin" (a dynamically loadable bash
> module) on cygwin. Here's the error message I get via automake/make:
> $ make
> gcc -g -O2 -o set0.exe -shared set0-set0.o
> set0-set0.o: In function `set0_builtin':
> /tmp/bashdb/builtin/set0.c:46: undefined reference to `_builtin_error'
> /tmp/bashdb/builtin/set0.c:47: undefined reference to `_builtin_usage'
> /tmp/bashdb/builtin/set0.c:51: undefined reference to `_dollar_vars'
> /tmp/bashdb/builtin/set0.c:52: undefined reference to `_xmalloc'
> /tmp/bashdb/builtin/set0.c:52: undefined reference to `_dollar_vars'
> /tmp/bashdb/builtin/set0.c:42: undefined reference to `_builtin_error'
> /tmp/bashdb/builtin/set0.c:43: undefined reference to `_builtin_usage'
> collect2: ld returned 1 exit status
> make: *** [set0.exe] Error 1
> The complete Makefile.am and code is listed at
> Perhaps I need to tell cygwin that these symbols are supposed to be
> undefined since they are part of bash?
Close. The Windows loader doesn't allow undefined symbols. The mechanism
to simulate them is to use a library of "thunks" called an import library.
You link against the import library instead.
Since I don't know anything about how to create bash builtins, I don't know
if there's a facility for doing this with Cygwin (or native Windows for that
matter). I suppose if not, you could always write your own thunks. But
it's probably worth a google or two before investigating that path.
> Q: Are you sure?
>> A: Because it reverses the logical flow of conversation.
>>> Q: Why is top posting annoying in email?
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