Re: Building the GNU cgicc library...

[Nicholas Wourms <nwourms at myrealbox dot com>]

Bakken, Luke wrote:

> Hi all,
>
> Just trying to get cgicc 3.2.2 built on cygwin...
>
> Here's my environment:
> Windows XP Professional Ver 5.1 Build 2600 Service Pack 1
>     Cygwin DLL version info:
>         DLL version: 1.3.22
> g++ (GCC) 3.2 20020927 (prerelease)
>
> Using this and the latest cgicc library sources (3.2.2), I get the
> following errors:
>
> ----------
>
> /bin/bash ../libtool --mode=link g++  -Wall -W -pedantic -g -O2   -o
> libcgicc.la -rpath /usr/lib -version-info 5:0:0 CgiEnvironment.
> lo CgiInput.lo CgiUtils.lo Cgicc.lo FormEntry.lo FormFile.lo
> HTMLAttribute.lo HTMLAttributeList.lo HTMLDoctype.lo HTMLElement.lo HTM
> LElementList.lo HTTPContentHeader.lo HTTPCookie.lo HTTPHTMLHeader.lo
> HTTPHeader.lo HTTPPlainHeader.lo HTTPRedirectHeader.lo HTTPResp
> onseHeader.lo HTTPStatusHeader.lo MStreamable.lo
> libtool: link: warning: undefined symbols not allowed in i686-pc-cygwin
> shared libraries
^^^^^^^^^^^^^^^^^^^^

This may (or may not) be your problem, but your library is being built 
as a static archive eventhough you requested a shared library.  A first 
glance, the errors you listed later on could indicate a compiler error. 
 I noticed that, since last year, there have been quite a few C++ PR 
fixes, including some for Cygwin.  However, I can advise you on a 
possible way to fix the build so that it builds a shared library 
properly, which might resolve the problem.

Edit the makefile in that library's source directory and look for the 
line which contains the "-version-info 5:0:0" string.  Append 
"-no-undefined" after that string to get something like "-version-info 
5:0:0 -no-undefined".  Then make clean and rebuild.

This lib may or may not be trying to use external symbols (from another 
dll other than cygwin1.dll).  If it still complains about undefined 
symbols, you will need to figure out what external libraries it is 
trying to use and add them to the following line:

libcgicc_la_LIBADD=

If this fixes it for you, file a bug report with the program's author. 
Even if it doesn't, the package author can probably help you fix up the 
build system so that it will build properly.  Either way, make sure you 
convey the following points for building a cygwin target:

1)When building libtool shared libraries, you must pass "-no-undefined" 
at link time.

2)When building libtool shared libraries, you must pass *ALL* dependency 
libs(if any) at linktime (i.e. -lz, -lncurses, etc).

3)Using the latest libtool available is generally a good idea.

If you are feeling bold, you can try to fix the package and 
reautotoolize it yourself.  However, that process is way too complex for 
me to go into right now, as there can be many subtle pitfalls.  In fact, 
so much so that a book was written to cover the process of using those 
tools (although it is woefully out of date).  If you feel so inclined, 
do a google search for "autobook" to read the online version.  Good luck.

HTH,
Nicholas



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