CMake cannot find MathGL's dependency PNG

Asked Jan 05 '16 at 20:16

Active Jan 06 '16 at 08:21

Viewed 1,029 times

I'm trying to generate Visual Studio 2013 projects files for MathGL 2.3.3 with CMake.

For some reason cmake does not understand my PNG_PNG_INCLUDE_DIR statement.

cmake "-DZLIB_INCLUDE_DIR=c:\users\chenning\projects\zlib-1.2.8\" "-DZLIB_LIBRARY_DEBUG=c:\users\chenning\projects\zlib-1.2.8\zlib.lib" "-DZLIB_LIBRARY_Release=c:\users\chenning\projects\zlib-1.2.8\zlib.lib" "-DPNG_PNG_INCLUDE_DIR=C:\Users\chenning\projects\lpng1620\" "-DPNG_LIBRARY_DEBUG=C:\Users\chenning\projects\lpng1620\projects\vstudio\x64\Debug\libpng16.lib" "-DPNG_LIBRARY_Release=C:\Users\chenning\projects\lpng1620\projects\vstudio\x64\Release\libpng16.lib" .

The Path exists and the variable is really called PNG_PNG_INCLUDE_DIR with two PNG.

cmake is telling me:

-- Found ZLIB: c:\users\chenning\projects\zlib-1.2.8\zlib.lib
-- Could NOT find PNG (missing:  PNG_PNG_INCLUDE_DIR)
CMake Error at CMakeLists.txt:341 (message):
  Couldn't find PNG library.


-- Configuring incomplete, errors occurred!
See also "C:/Users/chenning/projects/mathgl-2.3.3/CMakeFiles/CMakeOutput.log".
See also "C:/Users/chenning/projects/mathgl-2.3.3/CMakeFiles/CMakeError.log".

When I set the paths with cmake-gui all works fine.

Any ideas what's wrong?

edited Jan 06 '16 at 08:21

usr1234567

21,601
16
108
128

asked Jan 05 '16 at 20:16

chhenning

2,017
3
26
44

Have you cleared the CMake chache? – usr1234567 Jan 06 '16 at 08:19
Yes, I did remove the CMakeFiles folder but the error remains. – chhenning Jan 06 '16 at 14:54
Having a look into the most recent MathGL code, it looks like you should set `PNG_INCLUDE_DIR`. Why do you assume you have to use the `PNG_PNG_` prefix? – usr1234567 Jan 06 '16 at 15:34
Look at the output of cmake in my question. It does ask for PNG_PNG_... – chhenning Jan 06 '16 at 16:22
Your right, that's an oddity of CMake's FindPNG.cmake. What's the complete path to png.h? – usr1234567 Jan 06 '16 at 16:41
C:\Users\chenning\projects\lpng1620 – chhenning Jan 06 '16 at 16:45
Have you tried adding `png.h` to `PNG_PNG_INCLUDE_DIR`? – usr1234567 Jan 06 '16 at 17:22

CMake cannot find MathGL's dependency PNG

0 Answers0