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https://issues.apache.org/jira/browse/XERCESC-2260?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17923691#comment-17923691
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Boris Kolpackov commented on XERCESC-2260:
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Fixed in the 3.3 branch (also for the autoconf header). Thanks for the report
and the patch!
> Header include test uses #if instead of #ifdef
> ----------------------------------------------
>
> Key: XERCESC-2260
> URL: https://issues.apache.org/jira/browse/XERCESC-2260
> Project: Xerces-C++
> Issue Type: Bug
> Components: Build
> Affects Versions: 3.2.4
> Environment: pkgsrc (on NetBSD)
> Reporter: Thomas Klausner
> Priority: Major
> Attachments:
> patch-src_xercesc_util_Xerces__autoconf__config.hpp.cmake.in
>
>
> When building xerces-c 3.2.4, it detects some system headers during the
> configuration step and then defines symbols if these are headers are found.
> If the headers are not found, the symbols are just not defined (instead of
> being defined to the value zero).
> However, the installed header files (that other projects use) check these
> symbols with `#if` instead of `#ifdef`, which doesn't work well with
> undefined symbols.
>
> I've attached a patch switching which fixes the problem for me.
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