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ASM Support
Build scripts of the libraries try to enable all CPU optimizations possible. But some libraries do not support CPU optimizations and configure/build operations fail when asm is enabled.
Below you can see the libraries and architectures that do not support asm. Other than these, all libraries are built with asm enabled.
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gmp
: Enabling assembly producescannot locate symbol "__gmp_binvert_limb_table"
error when library is loaded. -
gnutls
,libass
,xvidcore
,x264
: Enabling asm forx86
ABI causes text relocation errors inlibavfilter.so
,libavformat.so
andlibavcodec.so
. -
libtheora
: asm is disabled on LTS releases. Enabling asm causes random crashes on pre API 21 devices. -
libwebp
: This library dropped support forarm-v7a
architecture (armeabi-v7a without NEON) with release 1.0.2. Therefore, asm is disabled forarm-v7a
architecture. -
x265
: Assembly compilation fails forarm64-v8a
architecture. It is possible to buildarm-v7a
,arm-v7a-neon
andx86
with assembly enabled but all three ABIs include relocation errors. Additionally, assembly onx86-64
causes linking errors.
-
gmp
: Enabling assembly onarmv7
,armv7s
,arm64
andarm64e
architectures causesconfigure
to fail withconfigure: error: cannot determine how to define a 32-bit word
. -
kvazaar
,libass
,libvpx
,openh264
: Enabling asm inx86-64
architecture does not cause any compilation errors. But creatingxcframework
bundles fails with the following error. Assembly is disabled for these libraries inx86-64
architecture to resolve this error.The CodingKeys(stringValue: "SupportedPlatform", intValue: nil) is empty in library -x86_64.
-
libjpeg-turbo
: Build fails oni386
architecture witherror: symbol '.no_avx2' undefined
error. -
wavpack
: Build fails on allarm
architectures when asm is enabled. -
xvidcore
: Build fails fori386
architecture when asm is enabled.ffmpeg
crashes when asm is enabled onx86-64
architecture. -
x265
: Assembly compilation fails forarm64
andarm64e
architectures.
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