shithub: libvpx

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Add default flags for arm64/armv8 builds

Allows building simple targets with sane default flags.

For example, using the Android arm64 toolchain from the NDK:
https://developer.android.com/ndk/guides/standalone_toolchain.html
./build/tools/make-standalone-toolchain.sh --arch=arm64 \
  --platform=android-24 --install-dir=/tmp/arm64
CROSS=/tmp/arm64/bin/aarch64-linux-android- \
  ~/libvpx/configure --target=arm64-linux-gcc --disable-multithread

BUG=webm:1143

Change-Id: I06f5a7564f5382cf1a4bad41aef4308566c53adf

--- a/build/make/configure.sh

+++ b/build/make/configure.sh

@@ -945,6 +945,9 @@

               check_add_cflags -mfpu=neon #-ftree-vectorize

               check_add_asflags -mfpu=neon

             fi

+          elif [ ${tgt_isa} = "arm64" ] || [ ${tgt_isa} = "armv8" ]; then

+            check_add_cflags -march=armv8-a

+            check_add_asflags -march=armv8-a

           else

             check_add_cflags -march=${tgt_isa}

             check_add_asflags -march=${tgt_isa}

--- a/configure

+++ b/configure

@@ -97,11 +97,11 @@

 # all_platforms is a list of all supported target platforms. Maintain

 # alphabetically by architecture, generic-gnu last.

+all_platforms="${all_platforms} arm64-darwin-gcc"

+all_platforms="${all_platforms} arm64-linux-gcc"

 all_platforms="${all_platforms} armv6-linux-rvct"

 all_platforms="${all_platforms} armv6-linux-gcc"

 all_platforms="${all_platforms} armv6-none-rvct"

-all_platforms="${all_platforms} arm64-darwin-gcc"

-all_platforms="${all_platforms} arm64-linux-gcc"

 all_platforms="${all_platforms} armv7-android-gcc"   #neon Cortex-A8

 all_platforms="${all_platforms} armv7-darwin-gcc"    #neon Cortex-A8

 all_platforms="${all_platforms} armv7-linux-rvct"    #neon Cortex-A8

@@ -111,6 +111,7 @@

 all_platforms="${all_platforms} armv7-win32-vs12"

 all_platforms="${all_platforms} armv7-win32-vs14"

 all_platforms="${all_platforms} armv7s-darwin-gcc"

+all_platforms="${all_platforms} armv8-linux-gcc"

 all_platforms="${all_platforms} mips32-linux-gcc"

 all_platforms="${all_platforms} mips64-linux-gcc"

 all_platforms="${all_platforms} sparc-solaris-gcc"