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https://issues.apache.org/jira/browse/XERCESC-2194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17052442#comment-17052442
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Roger Leigh commented on XERCESC-2194:
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Looking at https://cmake.org/cmake/help/v3.16/module/CheckTypeSize.html I agree
that HAVE_<TYPE> should be fine. However, I'm curious as to why the existing
logic is not working for you. What is the value of SIZEOF_SSIZE_T if you print
it out? Both "" and 0 should evaluate to false. That's my understanding of
https://cmake.org/cmake/help/v3.0/command/if.html
HAVE_<TYPE> was present back to CMake 3.0, so there are no compatibility
concerns to switching over. If you want to open a PR, I'll be happy to test.
> Including Xerces_autoconf_config.hpp on Windows fails due to undefined ssize_t
> ------------------------------------------------------------------------------
>
> Key: XERCESC-2194
> URL: https://issues.apache.org/jira/browse/XERCESC-2194
> Project: Xerces-C++
> Issue Type: Bug
> Components: Build
> Affects Versions: 3.2.2
> Reporter: Rasmus Thomsen
> Assignee: Scott Cantor
> Priority: Major
> Fix For: 3.2.3
>
>
> When including Xerces_autoconf_config.hpp on Windows the following error
> messages:
>
> {code:cpp}
> error C4430: Fehlender Typspezifizierer - int wird angenommen. Hinweis:
> "default-int" wird von C++ nicht unterstützt.
> error C2146: Syntaxfehler: Fehlendes ";" vor Bezeichner "XMLSSize_t"
> {code}
> (Sorry that these are in German - they translate to "Missing type specifier -
> assuming int" and "syntax error: missing ";" before identifier "XMLSSize_t")
> Apparently ssize_t is a POSIX extension and as such isn't available in MSVC
> (by default?)
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