X-Recipient: archive-cygwin AT delorie DOT com X-SWARE-Spam-Status: No, hits=-1.5 required=5.0 tests=AWL,BAYES_00,RCVD_IN_DNSWL_NONE X-Spam-Check-By: sourceware.org X-Yahoo-SMTP: Uu383n6swBCEN1G9up0WSnxbvN8fCPmk Message-ID: <4DD4713C.70001@cygwin.com> Date: Wed, 18 May 2011 21:24:12 -0400 From: "Larry Hall (Cygwin)" Reply-To: cygwin AT cygwin DOT com User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.17) Gecko/20110414 Lightning/1.0b2 Mnenhy/0.8.3 Thunderbird/3.1.10 ThunderBrowse/3.3.5 MIME-Version: 1.0 To: cygwin AT cygwin DOT com Subject: Re: How does one make a bash "builtin" (shared loadable module) on cygwin References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com Delivered-To: mailing list cygwin AT cygwin DOT com 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 > http://bashdb.git.sourceforge.net/git/gitweb.cgi?p=bashdb/bashdb;a=tree;f=builtin;h=428fd8f3598c88eabb10b3ba800fb900da9f858c;hb=HEAD > > 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. -- Larry _____________________________________________________________________ A: Yes. > Q: Are you sure? >> A: Because it reverses the logical flow of conversation. >>> Q: Why is top posting annoying in email? -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple