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Subject:	bash: loadable builtins
From:	"Yaakov (Cygwin/X)" <yselkowitz AT users DOT sourceforge DOT net>
To:	cygwin AT cygwin DOT com
Date:	Tue, 07 Aug 2012 02:37:50 -0500
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Eric,

As there was a question on this in IRC tonight, it is possible to make
bash loadable builtins work on Cygwin.

1) In src_compile(), add
LOCAL_LDFLAGS='-Wl,--export-all,--out-implib,lib$(@:.exe=.dll.a)' to the
final cygmake command.

2) In src_install(), add the following immediately after cyginstall:
  dolib libbash.dll.a
  cd ${S}
  includeinto bash
  doinclude [^y]*.h builtins/*.h include/*.h lib/{glob,tilde}/*.h
${B}/[^y]*.h

3) Builtins are compiled with `gcc -shared -I/usr/include/bash -o
foo.dll foo.c -lbash'

4) The builtin can then be loaded with enable -f foo.dll foo etc.

The only caveat is that this will only work with bash.exe, not sh.exe,
but as the latter should only be used with portable code, IMO that's a
reasonable restriction.

HTH,


Yaakov



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