Running into this issue where cinterop generation for libjpeg fails with the following error: `Excep...

# kotlin-native

[napperley]

Running into this issue where cinterop generation for libjpeg fails with the following error: Exception in thread "main" java.lang.Error: /usr/include/jpeglib.h:792:3: error: unknown type name 'size_t'
Below are the contents of the def file:

headers = jpeglib.h
linkerOpts = -ljpeg
linkerOpts.linux_x64 = -L/usr/lib/x86_64-linux-gnu

The following include paths are used in the build file: "/usr/include", "/usr/include/x86_64-linux-gnu"

[napperley]

Using headerFilter in the def file won't work since the header files are located in the system include directories (/usr/include and /usr/include/x86_64-linux-gnu).

[JoakimForslund]

Ehm, add`stdlib.h` or stddef.h before jpeglib.h ?

[napperley]

Adding any of the mentioned header files results in the following error appearing: Exception in thread "main" java.lang.Error: /usr/include/jpeglib.h:916:52: error: unknown type name 'FILE'

[napperley]

As soon as one cinterop error is resolved another one appears in its place (whack a mole include errors) 😦 .

[napperley]

Tried an alternative method with using a custom built libjpeg that is statically linked. Below is the portion of the build file that is used for linking the library:

// ...            
cinterops.create("libjpeg") {
                val baseDir = "$homeDir/libjpeg_turbo-2.0.6/"
                includeDirs("$baseDir/include")
                extraOpts = listOf("-libraryPath", "$baseDir/lib/libjpeg.a")
            }
// ...

The def file only contains this single line: headers = jpeglib.h
Unfortunately this method doesn't work, and the same error appears: Exception in thread "main" java.lang.Error: /home/napperley/libjpeg_turbo-2.0.6/include/jpeglib.h:792:3: error: unknown type name 'size_t'

[JoakimForslund]

Don't really think your first approach is wrong, it's because when you import that jpeglib.h it does not allow for a "loading entrypoint" of the needed headers

[JoakimForslund]

Additionally to stdlib.h or stddef.h you need

stdio.h

[JoakimForslund]

It's all about that you need to include all headers that jpeglib.h needs

[JoakimForslund]

Just continue adding additional headers until it is resolved.

[JoakimForslund]

From the looks of things the FILE dependency is at the very end of jpeglib.h so you should be close.

[napperley]

Bit of a trying process but got there in the end simple smile . Below is the updated contents of the def file:

headers = stdio.h stdlib.h jpeglib.h
headerFilter = jpeglib.h

Hopefully only the API in jpeglib.h is exposed/indexed.