mirror of
https://github.com/webmproject/libwebp.git
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92 lines
2.7 KiB
Plaintext
92 lines
2.7 KiB
Plaintext
Description:
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============
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This file describes the compilation of libwebp using portable intrinsics /
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WebAssembly (wasm) to native targets using clang and CMake.
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Prerequisites:
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==============
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- cmake 2.8+
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- clang 3.9+ for portable intrinsics support; as wasm progresses a tip of tree
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build may be necessary.
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Building:
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=========
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- configure the project with CMake using:
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$ mkdir -p build && \
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cd build && \
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cmake -DWEBP_BUILD_DWEBP=1 -DCMAKE_C_COMPILER=clang -DWEBP_ENABLE_WASM=1 ../
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- compile dwebp using 'make'.
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- Note this currently generates native executables only and is incompatible
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with -DWEBP_BUILD_WEBP_JS.
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Build options:
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==============
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- platform specific multiply high (mulhi) implementation, disabled by default.
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arm: -DCMAKE_C_FLAGS='-DENABLE_NEON_BUILTIN_MULHI_INT16X8 ...'
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x86: -DCMAKE_C_FLAGS='-DENABLE_X86_BUILTIN_MULHI_INT16X8 ...'
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Cross compilation:
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==================
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- arm toolchains can be obtained from:
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http://www.linaro.org/downloads/
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- the android ndk can be obtained from:
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https://developer.android.com/ndk/downloads/index.html
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armv7:
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------
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Android:
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$ ./android-ndk-r15b/build/tools/make_standalone_toolchain.py \
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--arch arm --api 24 --stl gnustl --install-dir /opt/android-arm-24
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$ mkdir -p build && cd build
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$ cmake ../libwebp \
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-DWEBP_BUILD_DWEBP=1 \
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-DCMAKE_C_COMPILER=/opt/android-arm-24/bin/clang \
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-DCMAKE_PREFIX_PATH=/opt/android-arm-24/sysroot/usr/lib \
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-DCMAKE_C_FLAGS=-fPIE \
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-DCMAKE_EXE_LINKER_FLAGS=-Wl,-pie \
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-DCMAKE_BUILD_TYPE=Release \
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-DWEBP_ENABLE_WASM=1
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Linux:
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$ gcc_arm=/opt/gcc-arm; target=arm-linux-gnueabihf
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$ mkdir -p build && cd build
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$ cmake ../libwebp -DWEBP_BUILD_DWEBP=1 -DWEBP_ENABLE_WASM=1 \
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-DCMAKE_C_COMPILER=clang \
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-DCMAKE_C_FLAGS="--target=$target --gcc-toolchain=$gcc_arm --sysroot=$gcc_arm/$target/libc -march=armv7-a -mfpu=neon" \
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-DCMAKE_PREFIX_PATH=$gcc_arm/$target/libc/usr
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aarch64 / arm64:
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----------------
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Android:
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$ ./android-ndk-r15b/build/tools/make_standalone_toolchain.py \
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--arch arm64 --api 24 --stl gnustl --install-dir /opt/android-arm64-24
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$ mkdir -p build && cd build
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$ cmake ../libwebp \
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-DWEBP_BUILD_DWEBP=1 \
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-DCMAKE_C_COMPILER=/opt/android-arm64-24/bin/clang \
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-DCMAKE_PREFIX_PATH=/opt/android-arm64-24/sysroot/usr/lib \
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-DCMAKE_C_FLAGS=-fPIE \
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-DCMAKE_EXE_LINKER_FLAGS=-Wl,-pie \
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-DCMAKE_BUILD_TYPE=Release \
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-DWEBP_ENABLE_WASM=1
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Linux:
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$ gcc_arm=/opt/gcc-aarch64; target=aarch64-linux-gnu
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$ mkdir -p build && cd build
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$ cmake ../libwebp -DWEBP_BUILD_DWEBP=1 -DWEBP_ENABLE_WASM=1 \
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-DCMAKE_C_COMPILER=clang \
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-DCMAKE_C_FLAGS="--target=$target --gcc-toolchain=$gcc_arm --sysroot=$gcc_arm/$target/libc" \
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-DCMAKE_PREFIX_PATH=$gcc_arm/$target/libc/usr
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