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From: Roger Leigh <rleigh@codelibre.net>
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To: miguel medalha <medalist@sapo.pt>
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Subject: Re: [Tiff] Libdeflate not found ?
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On 6 Mar 2021, at 22:15, miguel medalha <medalist@sapo.pt> wrote:
>=20
>=20
> After the latest changes in the main CMakeLists.txt, libdeflate is no =
longer
> found automatically:
>=20
> -- Could NOT find Deflate (missing: Deflate_LIBRARY)
>=20
> Even if specifying the library's location with =
'-DDEFLATE_LIBRARY:FILEPATH=3D'
> it is still not found, CMake gives the same warning, as well as:
>=20
>  Manually-specified variables were not used by the project:
>    DEFLATE_INCLUDE_DIR
>    DEFLATE_LIBRARY
>=20
> Now if we modify the command line to the form =
'-DDeflate_LIBRARY:FILEPATH=3D
> the library is found. This goes against the practice with all other
> libraries, which are specified in an ALL UPPERCASE format.
>=20
> Was this change on purpose and, in the affirmative, why is the format =
in
> this case going against all other cases?

Regarding the naming and the overall rationale for the change, please =
see the MR description and discussion comments on =
https://gitlab.com/libtiff/libtiff/-/merge_requests/224 =
<https://gitlab.com/libtiff/libtiff/-/merge_requests/224>.  The main aim =
here is to take the custom logic we=E2=80=99ve written to match the =
Autotools build, and to turn it into proper CMake Find modules with all =
the expected behaviour provided by find_package that one would expect, =
from the detection of debug and release library variants, to the =
semantics of the include and library finding, version detection, to =
result variables, and imported targets.

If you haven=E2=80=99t done so already, I would suggest deleting =
CMakeCache.txt and re-running CMake to check it discovers libdeflate =
properly.  If it doesn=E2=80=99t, maybe there=E2=80=99s some additional =
portability work required.  It is not expected that there should be any =
change here.

If libdeflate isn=E2=80=99t on a standard search path, you might need to =
use CMAKE_PREFIX_PATH to specify where to search (used by find_path, =
find_library etc).

If it=E2=80=99s still not working after retrying after deleting the =
cache, please could you attach a transcript of the cmake run, the =
CMakeCache.txt, CMakeOutput.txt, CMakeError.txt and some details about =
where libdeflate is installed on your system.


Kind regards,
Roger


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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">On =
6 Mar 2021, at 22:15, miguel medalha &lt;<a =
href=3D"mailto:medalist@sapo.pt" class=3D"">medalist@sapo.pt</a>&gt; =
wrote:<br class=3D""><div><blockquote type=3D"cite" class=3D""><br =
class=3D"Apple-interchange-newline"><div class=3D""><div class=3D""><br =
class=3D"">After the latest changes in the main CMakeLists.txt, =
libdeflate is no longer<br class=3D"">found automatically:<br =
class=3D""><br class=3D"">-- Could NOT find Deflate (missing: =
Deflate_LIBRARY)<br class=3D""><br class=3D"">Even if specifying the =
library's location with '-DDEFLATE_LIBRARY:FILEPATH=3D'<br class=3D"">it =
is still not found, CMake gives the same warning, as well as:<br =
class=3D""><br class=3D""> &nbsp;Manually-specified variables were not =
used by the project:<br class=3D""> =
&nbsp;&nbsp;&nbsp;DEFLATE_INCLUDE_DIR<br class=3D""> =
&nbsp;&nbsp;&nbsp;DEFLATE_LIBRARY<br class=3D""><br class=3D"">Now if we =
modify the command line to the form '-DDeflate_LIBRARY:FILEPATH=3D<br =
class=3D"">the library is found. This goes against the practice with all =
other<br class=3D"">libraries, which are specified in an ALL UPPERCASE =
format.<br class=3D""><br class=3D"">Was this change on purpose and, in =
the affirmative, why is the format in<br class=3D"">this case going =
against all other cases?<br class=3D""></div></div></blockquote></div><br =
class=3D""><div class=3D"">Regarding the naming and the overall =
rationale for the change, please see the MR description and discussion =
comments on&nbsp;<a =
href=3D"https://gitlab.com/libtiff/libtiff/-/merge_requests/224" =
class=3D"">https://gitlab.com/libtiff/libtiff/-/merge_requests/224</a>. =
&nbsp;The main aim here is to take the custom logic we=E2=80=99ve =
written to match the Autotools build, and to turn it into proper CMake =
Find modules with all the expected behaviour provided by find_package =
that one would expect, from the detection of debug and release library =
variants, to the semantics of the include and library finding, version =
detection, to result variables, and imported targets.</div><div =
class=3D""><br class=3D""></div><div class=3D"">If you haven=E2=80=99t =
done so already, I would suggest deleting CMakeCache.txt and re-running =
CMake to check it discovers libdeflate properly. &nbsp;If it doesn=E2=80=99=
t, maybe there=E2=80=99s some additional portability work required. =
&nbsp;It is not expected that there should be any change here.</div><div =
class=3D""><br class=3D""></div><div class=3D"">If libdeflate isn=E2=80=99=
t on a standard search path, you might need to use CMAKE_PREFIX_PATH to =
specify where to search (used by find_path, find_library etc).</div><div =
class=3D""><br class=3D""></div><div class=3D"">If it=E2=80=99s still =
not working after retrying after deleting the cache, please could you =
attach a transcript of the cmake run, the CMakeCache.txt, =
CMakeOutput.txt, CMakeError.txt and some details about where libdeflate =
is installed on your system.</div><div class=3D""><br =
class=3D""></div><div class=3D""><br class=3D""></div><div class=3D"">Kind=
 regards,</div><div class=3D"">Roger</div><div class=3D""><br =
class=3D""></div></body></html>=

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