NMake Makefiles: Support ARM64 Windows builds

fanc999-1 · fanc999-1 · commit d99eb7b1c5b8 · 2020-07-08T16:12:49.000+08:00
This will make the NMake Makefiles capable of building ARM64 binaries of libsigc++,
which can be used on Windows 10 on ARM systems.
diff --git a/MSVC_NMake/detectenv-msvc.mak b/MSVC_NMake/detectenv-msvc.mak
@@ -68,6 +68,8 @@ _HASH=^#
     && ![echo PLAT=Win32 >> vercl.x] \
     && ![echo $(_HASH)elif defined(_M_AMD64) >> vercl.x] \
     && ![echo PLAT=x64 >> vercl.x] \
+    && ![echo $(_HASH)elif defined(_M_ARM64) >> vercl.x] \
+    && ![echo PLAT=arm64 >> vercl.x] \
     && ![echo $(_HASH)endif >> vercl.x] \
     && ![cl -nologo -TC -P vercl.x $(ERRNUL)]
 !include vercl.i
@@ -129,6 +131,8 @@ CFLAGS_ADD = /MDd /Od
 
 !if "$(PLAT)" == "x64"
 LDFLAGS_ARCH = /machine:x64
+!elseif "$(PLAT)" == "arm64"
+LDFLAGS_ARCH = /machine:arm64
 !else
 LDFLAGS_ARCH = /machine:x86
 !endif
