Re: [xml] libxml2-2.7.8 and MinGW

[Earnie <earnie users sourceforge net>]

Earnie wrote:
> Roumen Petrov wrote:
> > Earnie wrote:
> > > Earnie wrote:
> > > > Roumen Petrov wrote:
> > > > > Earnie wrote:
> > > > > > Earnie wrote:
> > > > > > > I've been building libxml2-2.7.8 and have been having a heck of
> > > > > > > a time getting xmlcatalog to work with a shared DLL library.
> > > > > > > I've finally confirmed that the issue is caused by optimizations
> > > > > > > with -O2 or -O1. If I use -O0 the issue goes away. The effect is
> > > > > > > the xmlIsPubidChar_tab array is seen by xmlcatalog to contain all
> > > > > > > 0x00 values. I'm using GCC-4.6.1 and binutils-2.21.53.20110804
> > > > > > > as delivered by MinGW. I wanted give this list a report of what
> > > > > > > I've found in the event others come by, they may have already.
> > > > > hmm ,
> > > > >
> > > > > Look like regression as it is fine with me for gcc/binutils: -
> > > > > 3.4.5/2.17.50 20070129 - 4.4.0/2.19.1
> > > > It was Kai Tietz who is active in GCC development for Windows and one of
> > > > its maintainers who pointed me to the issue resolution.
> > > >
> > > > See http://thread.gmane.org/gmane.comp.gnu.mingw.user/38000 for the
> > > > discussion.
> > [SNIP]
> > Above like is fine to follow the thread .
> > I'm not against the patch
> > a) it will resolve linking issue if libxml2 is build with gcc (mingw)
> > and -nocommon flag.
> > b) it will resolve issue with new gnu compiler/linker
> > c) libxslt and xmlsec for instance use extern for mingw* compilers
> >
> > Lets first finish discussion on mingw list as libxml and libxslt does
> > not use extern for cygwin compiler. If cygwin build is impacted then
> > complete patch must cover both woe compilers. Also  another patch for
> > libxslt is required .
>
> As discussed on the MinGW list here are the patches for both libxml2 and
> libxslt adorning dllexport with extern for both __CYGWIN__ and __MINGW32__.
>
> During the discussion on the MinGW list we discovered the following bit
> of information about dllexport:
>
> From:
> http://msdn.microsoft.com/en-us/library/y4h7bcy6.aspx
>
> The use of dllexport implies a definition, while dllimport implies a
> declaration. You must use the extern keyword with dllexport to force a
> declaration; otherwise, a definition is implied.
And now with attachments.

-- 
Earnie
-- https://sites.google.com/site/earnieboyd/

Attachment: libxml2-git-mingw32.patch.txt
Description: Text document

Attachment: libxslt-git-mingw32.patch.txt
Description: Text document