make.sh: add new option 'macos-universal' to build MacOS universal binaries

Makefile

@@ -105,10 +105,14 @@ ifeq ($(IS_APPLE),1)
 EXT = dylib
 VERSION_EXT = $(API_MAJOR).$(EXT)
 $(LIBNAME)_LDFLAGS += -dynamiclib -install_name lib$(LIBNAME).$(VERSION_EXT) -current_version $(PKG_MAJOR).$(PKG_MINOR).$(PKG_EXTRA) -compatibility_version $(PKG_MAJOR).$(PKG_MINOR)
+ifeq ($(MACOS_UNIVERSAL),yes)
 $(LIBNAME)_LDFLAGS += -m32 -arch i386 -m64 -arch x86_64
+endif
 AR_EXT = a
 UNICORN_CFLAGS += -fvisibility=hidden
+ifeq ($(MACOS_UNIVERSAL),yes)
 UNICORN_CFLAGS += -m32 -arch i386 -m64 -arch x86_64
+endif
 else
 # Cygwin?
 IS_CYGWIN := $(shell $(CC) -dumpmachine | grep -i cygwin | wc -l)

docs/COMPILE-NIX.md

@@ -58,6 +58,11 @@ To build Unicorn on *nix (such as MacOSX, Linux, *BSD, Solaris):
 
         $ ./make.sh
 
+  On Mac OS, to build universal binaries including both 32-bit & 64-bit code,
+  replace above command with:
+
+        $ ./make.sh macos-universal
+
 - Unicorn requires Python 2.x to compile. If Python 2.x is not the default
     Python interpreter, ensure that the appropriate option is set:
 

make.sh

@@ -41,6 +41,12 @@ build() {
   ${MAKE}
 }
 
+build_macos_universal() {
+  [ "$UNAME" = Darwin ] && LIBARCHS="i386 x86_64"
+  MACOS_UNIVERSAL=yes \
+  ${MAKE}
+}
+
 build_cross() {
   [ "$UNAME" = Darwin ] && LIBARCHS="i386 x86_64"
   CROSS=$1
@@ -97,6 +103,7 @@ export CC INSTALL_BIN PREFIX PKGCFGDIR LIBDIRARCH LIBARCHS CFLAGS LDFLAGS
 
 case "$1" in
   "" ) build;;
+  "macos-universal" ) build_macos_universal;;
   "asan" ) asan;;
   "default" ) build;;
   "install" ) install;;