Issue with GR_GL_GetIntegerv in the SDL example

[Alexander Vestin]

Hi,

I'm trying to run the skia SDL example, using an existing opengl context.

However when I try to compile the example I get the following error:

/usr/bin/ld: /tmp/ccHkF2it.o: in function `main':
/home/alex/node-gles/binding/test_skia.cc:198: undefined reference to `gLogCallsGL'
/usr/bin/ld: /home/alex/folder/binding/test_skia.cc:198: undefined reference to `gCheckErrorGL'
/usr/bin/ld: /home/alex/folder/binding/test_skia.cc:198: undefined reference to `GrGLCheckErr(GrGLInterface const*, char const*, char const*)'
collect2: error: ld returned 1 exit status

I narrowed it down to this line , setting the buffer to 0 and commenting out that line works for it to the draw to the screen this case, but I'm wondering if there are any flags or something I am missing to provide to the compiler or in the build process?

I built skia with

gclient config --unmanaged https://skia.googlesource.com/skia.git

gclient sync

cd skia

mkdir -p out

gn gen out/Debug --args="is_official_build=true is_component_build=true"

ninja -C out/Debug

on Manjaro linux, and compiled using

g++ -std=c++17 -Wall -ggdb3 -g -lSDL2 -ldng_sdk -lexpat -lharfbuzz -ljpeg -lskia -lpng -ljpeg -lpathkit -lpng -lskresources -lsksg -lskshaper -lGL -I/path/to/include -L/path/to/libs test_skia.cc -o main.out

I sort of just threw flags on there to try and find the missing references, but most of them are probably not needed. Anyone seeing what's going wrong here?

Regards,

Alex

[Brian Salomon]

I think the problem is that GR_GL_GetIntegerv is a macro that expands to code that references a global (in debug builds). The global is not exported as part of the shared library. So when it's expanded in test_skia.cc it can't be found by the linker.

In general you shouldn't expect anything you #include from src/ to work in a shared library build for similar reasons. We consider the header files under src/ to be "private" and aren't meant to be used by clients.

Brian

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[Alexander Vestin]

That makes sense, thanks for the swift response!

Alex

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