Missing header files when trying to build Skia

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Fudge

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Oct 8, 2019, 10:42:23 AM10/8/19
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Mike Klein

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Oct 8, 2019, 10:47:44 AM10/8/19
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If you don't have libpng (png.h) or zlib (zlib.h) you'll want to set skia_use_libpng = false and skia_use_zlib = false in out/Static/args.gn by running `gn args out/Static`.  You should probably also keep in mind you're doing a developer, debug build.

Most users of Skia should set is_official_build=true, and most developers should leave it to its false default.

This mode configures Skia in a way that’s suitable to ship: an optimized build with no debug symbols, dynamically linked against its third-party dependencies using the ordinary library search path.

In contrast, the developer-oriented default is an unoptimized build with full debug symbols and all third-party dependencies built from source and embedded into libskia. This is how we do all our manual and automated testing.

Skia offers several features that make use of third-party libraries, like libpng, libwebp, or libjpeg-turbo to decode images, or ICU and sftnly to subset fonts. All these third-party dependencies are optional and can be controlled by a GN argument that looks something like skia_use_foo for appropriate foo.

If skia_use_foo is enabled, enabling skia_use_system_foo will build and link Skia against the headers and libaries found on the system paths. is_official_build=true enables all skia_use_system_foo by default. You can use extra_cflags and extra_ldflags to add include or library paths if needed.



On Tue, Oct 8, 2019 at 9:42 AM Fudge <natandes...@gmail.com> wrote:

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Fudge

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Oct 8, 2019, 10:57:01 AM10/8/19
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Oh! by "Most users of Skia should set is_official_build=true," I had assumed I was a user and should set the property to true. 
It seems to be building properly now. Thank you so much!
בתאריך יום שלישי, 8 באוקטובר 2019 בשעה 17:42:23 UTC+3, מאת Fudge:

Mike Klein

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Oct 8, 2019, 10:58:03 AM10/8/19
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You are, and you probably should?

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Fudge

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Oct 8, 2019, 11:00:59 AM10/8/19
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But doesn't  running `gn args out/Static` set it to false?
בתאריך יום שלישי, 8 באוקטובר 2019 בשעה 17:58:03 UTC+3, מאת Mike Klein:
You are, and you probably should?

On Tue, Oct 8, 2019 at 9:57 AM Fudge <natandes...@gmail.com> wrote:
Oh! by "Most users of Skia should set is_official_build=true," I had assumed I was a user and should set the property to true. 
It seems to be building properly now. Thank you so much!
בתאריך יום שלישי, 8 באוקטובר 2019 בשעה 17:42:23 UTC+3, מאת Fudge:

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Mike Klein

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Oct 8, 2019, 11:16:20 AM10/8/19
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is_official_build is false by default.  You can see all your settings by running `gn args <dir> --list` to double check you have it set the way you want.

When is_official_build set to false, is_debug defaults to true, so you'll get massive binaries filled with debug symbols, little to no compiler optimization.  And all the various skia_use_some_library flags default to settings we like for testing, with most of skia_use_system_some_library set to false for our own convenience of being able to build these from source at a particular consistent version we like for testing.

When is_official_build is set to true, is_debug defaults to false, so you'll get smaller faster binaries.  And we still set all the skia_use_some_library flags based mostly on what makes sense for your target platform, but the skia_use_system_some_library flags will all start as true to build against your system versions of those libraries instead of building from source.  You can set skia_use_system_some_library = false to go back to building it from source, or skia_use_some_library = false to skip the whole feature.

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Fudge

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Oct 8, 2019, 1:12:32 PM10/8/19
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Oh, I understand now (I think). Thank you!

בתאריך יום שלישי, 8 באוקטובר 2019 בשעה 18:16:20 UTC+3, מאת Mike Klein:

Fudge

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Oct 8, 2019, 1:32:14 PM10/8/19
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I seem to be missing a lot of libraries (ilibpng, zlib ,libjpeg ,harfbuzz, libwebp,expat), hopefully that won't cause problems down the line. 

בתאריך יום שלישי, 8 באוקטובר 2019 בשעה 20:12:32 UTC+3, מאת Fudge:

Mike Klein

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Oct 8, 2019, 1:33:50 PM10/8/19
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Yeah, it's fairly uncommon to have any of that on Windows.

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Sal

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Aug 7, 2020, 5:24:30 PM8/7/20
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So we can do a dev build with is_official_build=false. But what do we do when we need to distribute out application for Windows users. How do we build with is_official_build=true for generating dll for distribution to users if these libraries are not available on Windows?

Mike Klein

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Aug 7, 2020, 5:29:44 PM8/7/20
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There are settings like 'skia_use_libpng=false' that you can use to turn off Skia's dependency on missing libraries, or you can build and ship those libraries along with Skia of course.

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