Test using lipo and cmake toolchain

conanfile.py

@@ -1,5 +1,8 @@
 from conan import ConanFile
 import shutil
+import get_arch
+from conan.tools.cmake import CMake, CMakeToolchain, cmake_layout
+from conan.tools.apple import is_apple_os
 
 class ApngasmRecipe(ConanFile):
     settings = 'os', 'compiler', 'build_type', 'arch'
@@ -16,4 +19,10 @@ def build_requirements(self):
             self.tool_requires("cmake/[>=3.27]")
 
     def build(self):
-        build_type = 'Release'
+        build_type = 'Release'
+
+    def generate(self):
+        tc = CMakeToolchain(self)
+        if is_apple_os(self) and get_arch == 'universal2':
+            tc.blocks['apple_system'].values['cmake_osx_architectures'] = 'x86_64; arm64'
+        tc.generate()

get_deps.py

@@ -60,30 +60,25 @@ def install_deps(arch):
 def main():
     arch = get_arch()
     if arch == 'universal2':
-        conan_output = os.path.join('conan_output/x86_64')
-        if os.path.isdir(conan_output):
-            print('Dependencies found at:' + conan_output)
-            print('Skip conan install...')
-            return
+        conan_output = 'conan_output/x86_64'
     else:
-        conan_output_1 = 'conan_output/x86_64'
-        conan_output_2 = 'conan_output/armv8'
-        if os.path.isdir(conan_output_1) and os.path.isdir(conan_output_2):
-            print('Dependencies (x86_64) found at:' + conan_output_1)
-            print('Dependencies (armv8) found at:' + conan_output_2)
-            print('Skip conan install...')
-            return
+        conan_output = 'conan_output/' + arch
+    if os.path.isdir(conan_output):
+        print('Dependencies found at:' + conan_output)
+        print('Skip conan install...')
+        return
 
-    conan_output = install_deps(arch)
-
-    if os.getenv('APNGASM_COMPILE_TARGET') == 'universal2':
+    if arch != 'universal2':
+        conan_output = install_deps(arch)
+    else:
         # Repeat to install the other architecture version of libwebp
         conan_output_x64 = install_deps('x86_64')
+        conan_output_arm = install_deps('armv8')
         conan_output_universal2 = conan_output.replace('armv8', 'universal2')
         shutil.rmtree(conan_output_universal2, ignore_errors=True)
         subprocess.run([
                         'python3', 'lipo-dir-merge/lipo-dir-merge.py', 
-                        conan_output_x64, conan_output, conan_output_universal2
+                        conan_output_x64, conan_output_arm, conan_output_universal2
                         ])
 
         shutil.rmtree(conan_output_x64)