Re: zlib autoconf question

[Jérémie Courrèges-Anglas]

Lars Magne Ingebrigtsen <address@hidden> writes:

> I'm not sure whether it's really necessary to check for zlib -- does
> Emacs even build without png support these days? -- but perhaps it is.
>
> Anyway, I wrote the obvious:
>
>   AC_CHECK_LIB(z, inflateInit2, HAVE_ZLIB=yes, HAVE_ZLIB=no)
>
> And that fails with:
>
> /home/larsi/src/emacs/trunk/conftest.c:118: undefined reference to 
> `inflateInit2'
>
> But inflateInit2 definitely exists (it's the function decompress.c
> uses).
>
> However, running strings over libz says:
>
> inflateReset
> inflateReset2
> inflateInit2_
> inflateInit_
>
> And
>
>   AC_CHECK_LIB(z, inflateInit2_, HAVE_ZLIB=yes, HAVE_ZLIB=no)
>
> works!
>
> What's up with that?

inflateInit2 is a macro that "calls" inflateInit2_.

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