Class: Libpng::OHOS::ZlibBuilder

Inherits:
MiniPortileCMake
  • Object
show all
Defined in:
lib/libpng/ohos/zlib_builder.rb

Overview

Builds zlib as a static library (libz.a) using the OHOS NDK toolchain. The resulting archive is linked into libpng16.so so the OHOS gem doesn't depend on OHOS's non-standard libshared_libz.z.so at runtime.

zlib was chosen as a static dep rather than dynamically linking against the OHOS sysroot because:

- libpng's CMake find_package(ZLIB) expects libz.so
- OHOS ships zlib under the SONAME libshared_libz.z.so
- patchelf post-processing is fragile

Static linking sidesteps the whole problem.

Constant Summary collapse

ZLIB_VERSION =

Pinned zlib source URL + sha256. Bump deliberately.

'1.3.1'
ZLIB_URL = 
"https://zlib.net/fossils/zlib-#{ZLIB_VERSION}.tar.gz"
ZLIB_SHA256 = 
'9a93b2b7dfdac77ceba5a558a580e74667dd6fede4585b91eefb60f03b72df23'

Instance Method Summary collapse

Constructor Details

#initialize(ndk:) ⇒ ZlibBuilder

libpng's recipe extends MiniPortileCMake and redirects @target into the gem's working tree. We mirror that layout so the zlib port lives next to libpng's port under ports/.



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# File 'lib/libpng/ohos/zlib_builder.rb', line 28

def initialize(ndk:)
  super('zlib', ZLIB_VERSION)
  @files << { url: ZLIB_URL, sha256: ZLIB_SHA256 }
  @ndk = ndk
  @target = Libpng::Recipe::ROOT.join(@target).to_s
end

Instance Method Details

#configure_defaults ⇒ Object 



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# File 'lib/libpng/ohos/zlib_builder.rb', line 35

def configure_defaults
  super +
    [
      "-DCMAKE_TOOLCHAIN_FILE=#{@ndk.toolchain_path}",
      "-DOHOS_ARCH=#{OHOS::OHOS_ARCH}",
      "-DOHOS_PLATFORM=#{OHOS::OHOS_PLATFORM}",
      "-DCMAKE_SYSROOT=#{@ndk.sysroot_path}",
      '-DBUILD_SHARED_LIBS=OFF',
      '-DCMAKE_INSTALL_LIBDIR=lib',
      '-DCMAKE_BUILD_TYPE=Release'
    ]
end

#include_path ⇒ Object 



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# File 'lib/libpng/ohos/zlib_builder.rb', line 52

def include_path
  Pathname.new(port_path).join('include')
end

#libz_path ⇒ Object 



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# File 'lib/libpng/ohos/zlib_builder.rb', line 48

def libz_path
  Pathname.new(port_path).join('lib/libz.a')
end