configure: add aarch64 to ARCH_LIST

This will allow identifying Windows Visual Studio targets as aarch64;
the Microsoft compiler does not define __aarch64__.

An alternative would be to define this in the code, checking for
_M_ARM64 or _M_ARM64EC. For now we'll use the existing VPX_ARCH_*
system. For compatibility VPX_ARCH_ARM will continue to be defined to 1
in this case.

Bug: webm:1788
Bug: b/277255076
Change-Id: I12e25710891e86f0c7339ba96884c18ed90ba16f

2 files changed, 5 insertions, 0 deletions

diff --git a/build/make/configure.sh b/build/make/configure.sh
index 32105651f..ec9af5e63 100644
--- a/build/make/configure.sh
+++ b/build/make/configure.sh
@@ -842,6 +842,10 @@ process_common_toolchain() {
 
   # Enable the architecture family
   case ${tgt_isa} in
+    arm64 | armv8)
+      enable_feature arm
+      enable_feature aarch64
+      ;;
     arm*)
       enable_feature arm
       ;;
diff --git a/configure b/configure
index 890ad3968..20707727e 100755
--- a/configure
+++ b/configure
@@ -243,6 +243,7 @@ CODEC_FAMILIES="
 
 ARCH_LIST="
     arm
+    aarch64
     mips
     x86
     x86_64