[CMake] Trouble with FindPNG module

[Andrew Fuller]

Where did the library get installed on your system?  What's the value of CMAKE_<LANG>_LIBRARY_ARCHITECTURE?


Since you're on a 64-bit system, I'd expect CMake to be looking for 64-bit libraries unless you've told it otherwise.

________________________________
From: CMake <cmake-bounces at cmake.org> on behalf of Robert Dailey <rcdailey.lists at gmail.com>
Sent: April 24, 2017 7:54:18 AM
To: CMake; CMake Developers
Subject: Re: [CMake] Trouble with FindPNG module

Sorry to bump; any info on this? I'm completely blocked :-(

On Fri, Apr 21, 2017 at 4:48 PM, Robert Dailey <rcdailey.lists at gmail.com> wrote:
> I'm running CMake 3.8.0 on Ubuntu 14. I invoke the following:
>
> find_package(PNG REQUIRED)
>
> Which gives me the output in CMake:
>
> Could NOT find PNG (missing: PNG_LIBRARY) (found version "1.2.50")
>
> The CMakeCache.txt file has these variables set:
>
> PNG_LIBRARY_DEBUG:FILEPATH=PNG_LIBRARY_DEBUG-NOTFOUND
> PNG_LIBRARY_RELEASE:FILEPATH=PNG_LIBRARY_RELEASE-NOTFOUND
> PNG_PNG_INCLUDE_DIR:PATH=/usr/include
>
> So it found the headers, but not the libs. Why did it not find the
> libs? Note that my version of Ubuntu is 64-bit, and I've installed the
> 32-bit libs like so:
>
> $ sudo apt-get install libpng12-dev:i386
>
> Would the find module be confused because it is trying to find the
> 64-bit library? What's the issue?
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