gen_msvs_vcxproj: add ARM64EC w/VS >= 2022

rather than define new targets, add a platform to the arm64 list as they
share the same configuration.

Bug: webm:1788
Change-Id: Iac020280b1103fb12b559f21439aeff26568fba4

diff --git a/build/make/gen_msvs_vcxproj.sh b/build/make/gen_msvs_vcxproj.sh
index 482d88f..1e1db05 100755 (executable)
--- a/build/make/gen_msvs_vcxproj.sh
+++ b/build/make/gen_msvs_vcxproj.sh
@@ -269,6 +269,10 @@ case "$target" in
     ;;
     arm64*)
         platforms[0]="ARM64"
+        # As of Visual Studio 2022 17.5.5, clang-cl does not support ARM64EC.
+        if [ "$vs_ver" -ge 17 -a "$platform_toolset" != "ClangCl" ]; then
+            platforms[1]="ARM64EC"
+        fi
         asm_Debug_cmdline="armasm64 -nologo -oldit "%(FullPath)""
         asm_Release_cmdline="armasm64 -nologo -oldit "%(FullPath)""
     ;;