can't compile skia on mac for ios

[Moty Zaslavski]

Hi there,
I try to compile a skia app for ios from the Xcode.

Font related issues seemingly related to the linking stage are shown:

Undefined symbol: _CTFontGetUnderlineThickness

Undefined symbol: _CTFontGetUnderlinePosition

Undefined symbol: _CGAffineTransformConcat

Undefined symbol: _CGPathApply

Undefined symbol: _CTFontGetAdvancesForGlyphs

Undefined symbol: _CGRectApplyAffineTransform

Undefined symbol: _CTFontCreatePathForGlyph

Undefined symbol: _CGPathIsEmpty

Undefined symbol: _CGColorCreate

Undefined symbol: _CGContextSetAllowsFontSubpixelQuantization

Undefined symbol: _CGContextSetShouldSubpixelPositionFonts

Undefined symbol: _CGContextSetTextMatrix

Undefined symbol: _CGAffineTransformInvert

Undefined symbol: _CGBitmapContextCreate

Undefined symbol: _CGContextSetShouldAntialias

Undefined symbol: _CGContextSetTextDrawingMode

Undefined symbol: _CGContextSetGrayFillColor

Undefined symbol: _CTFontDrawGlyphs

Undefined symbol: _kCTFontVariationAxisMinimumValueKey

Undefined symbol: _kCTFontFormatAttribute

Undefined symbol: _CTFontCopyFullName

Undefined symbol: _CTFontCopyFamilyName

Undefined symbol: _CTFontCopyTable

Undefined symbol: _CTFontCopyVariationAxes

Undefined symbol: _CGFontCopyTableForTag

Undefined symbol: _kCTFontFamilyNameAttribute

Undefined symbol: _CTFontCopyGraphicsFont

Undefined symbol: _kCTFontVariationAxisIdentifierKey

Undefined symbol: _CTFontGetAscent

Undefined symbol: _CTFontGetGlyphsForCharacters

Undefined symbol: _CTFontGetGlyphCount

Undefined symbol: _CTFontGetCapHeight

Undefined symbol: _CTFontCopyAvailableTables

Undefined symbol: _CTFontCopyFontDescriptor

Undefined symbol: _CTFontCopyAttribute

Undefined symbol: _CTFontGetBoundingRectsForGlyphs

Undefined symbol: _CTFontCopyLocalizedName

Undefined symbol: _CTFontGetSymbolicTraits

Undefined symbol: _CTFontCopyCharacterSet

Undefined symbol: _CTFontGetXHeight

Undefined symbol: SkMetalDeviceToGrContext(id<MTLDevice>, id<MTLCommandQueue>)

Undefined symbol: _CGAffineTransformMakeScale

Undefined symbol: _CTFontCreateCopyWithSymbolicTraits

Undefined symbol: _kCTFontSymbolicTrait

Undefined symbol: _kCTFontWidthTrait

Undefined symbol: _kCTFontTraitsAttribute

Undefined symbol: _CGContextSetShouldSubpixelQuantizeFonts

Undefined symbol: _CTFontManagerCreateFontDescriptorFromData

Undefined symbol: _CTFontDescriptorCreateMatchingFontDescriptors

Undefined symbol: _kCTFontWeightTrait

Undefined symbol: _kCTFontSlantTrait

Undefined symbol: _CGContextSetShouldSmoothFonts

Undefined symbol: _CGFontGetUnitsPerEm

Undefined symbol: _CTFontGetLeading

Undefined symbol: _CTFontCopyPostScriptName

Undefined symbol: _CTFontGetSlantAngle

Undefined symbol: _CTFontDescriptorCreateWithAttributes

Undefined symbol: SkMtkViewToSurface(MTKView*, GrRecordingContext*)

Undefined symbol: _CTFontGetBoundingBox

Undefined symbol: _CTFontDescriptorCopyAttribute

Undefined symbol: _kCTFontVariationAxisDefaultValueKey

Undefined symbol: _kCTFontStyleNameAttribute

Undefined symbol: _kCTFontVariationAttribute

Undefined symbol: _CTFontGetDescent

Undefined symbol: _CTFontGetUnitsPerEm

Undefined symbol: _CTFontCreateCopyWithAttributes

Undefined symbol: SkMtkViewConfigForSkia(MTKView*)

Undefined symbol: _CGContextSetAllowsFontSubpixelPositioning

Undefined symbol: _CTFontCreateWithFontDescriptor

Undefined symbol: _CTFontCreateForString

Undefined symbol: _kCTFontFamilyNameKey

Undefined symbol: _CTFontCollectionCreateMatchingFontDescriptors

Undefined symbol: _CGContextSetFillColorWithColor

Undefined symbol: _CTFontCopyVariation

Undefined symbol: _kCTFontVariationAxisMaximumValueKey

Undefined symbol: _CTFontGetSize

Undefined symbol: _CGColorSpaceCreateDeviceRGB

Undefined symbol: _CTFontCollectionCreateFromAvailableFonts

Undefined symbol: GrContextRelease::operator()(GrDirectContext*)

Will be happy to any help))
Thanks 

[Clark Kent]

you need to link to CoreFoundation, CoreGraphics, and CoreText

[Moty Zaslavski]

Thank you very much!
Do you mean to add them here?)

[Moty Zaslavski]

Hi again,
Thank you for your suggestion, adding of the said libraries has resolved the linking issues!
However the application get stuck with a black screen and the following messages are shown:

2022-09-06 11:01:42.417070+0300 skiaTest[11668:1071082] GrMtlCommandBuffer: WARNING: Creating MTLCommandBuffer while in background.

2022-09-06 11:01:42.423975+0300 skiaTest[11668:1071082] [SceneConfiguration] Info.plist configuration "(no name)" for UIWindowSceneSessionRoleApplication contained UISceneDelegateClassName key, but could not load class with name "SceneDelegate".

2022-09-06 11:01:42.425867+0300 skiaTest[11668:1071082] [Storyboard] Unknown class ViewController in Interface Builder file.

2022-09-06 11:01:42.426144+0300 skiaTest[11668:1071082] [WindowScene] There is no scene delegate set. A scene delegate class must be specified to use a main storyboard file.

Any suggestions?)
Thanks...

[Clark Kent]

not sure about that

[Moty Zaslavski]

Hi again)

First and foremost it does work! Thank you!
However, I've got very strange issue:
first time when I run on the IOS device everything goes smoothly, second time and each consecutive time, the Xcode gets stuck 

I keep receiving the following message:

So, I changed the scheme to catch the issue as follows:

So I keep receiving the following messages:

==9596==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x00010581a100 at pc 0x0001004292e8 bp 0x00016f9dbc50 sp 0x00016f9dbc48

WRITE of size 8 at 0x00010581a100 thread T0

    #0 0x1004292e4 in sk_cfp<void const*>::sk_cfp()+0x88 (/private/var/containers/Bundle/Application/CA9EA294-DC30-4795-835B-39B73D78D03A/BasicTexturing.app/BasicTexturing:arm64+0x1000092e4)

    #1 0x100429248 in sk_cfp<void const*>::sk_cfp()+0x50 (/private/var/containers/Bundle/Application/CA9EA294-DC30-4795-835B-39B73D78D03A/BasicTexturing.app/BasicTexturing:arm64+0x100009248)

    #2 0x1004291e4 in GrMtlTextureInfo::GrMtlTextureInfo()+0x50

Any help will be greatly appreciated!

Thanks

[Jim Van Verth]

Hard to say without knowing what "AAPLRenderer initWithMetalKitView:" or "skiarenderer initWithDevice:queue:" are doing.

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[Trancy chu]

Hi, I had linked to CoreFoundation, CoreGraphics, and CoreText, but this error exist yet. error as follow:

Undefined symbols for architecture arm64:

  "GrContextRelease::operator()(GrDirectContext*)", referenced from:

      std::__1::unique_ptr<GrDirectContext, GrContextRelease>::reset(GrDirectContext*) in ViewController.o

Any help is greatly appreciated!