Command to deploy macOS/iOS universal binaries

extensions/commands/deploy-lipo/README.md

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+## Lipo commands
+
+These are commands to deploy macOS or iOS universal binaries.
+This wraps around Conan's full_deploy deployer and then runs `lipo` to
+produce universal binaries.
+
+
+#### [Deploy lipo](cmd_deploy_lipo.py)
+
+
+**Parameters**
+
+The same parameters as `deploy` except multiple profiles should be specified.
+
+```
+$ conan deploy-lipo . -pr x8_64 -pr armv8 -b missing -r conancenter
+```
+
+This assumes profiles named x86_64 and armv8 with corresponding architectures.
+Universal binaries can only have one binary per architecture but each can have
+different settings, e.g. minimum deployment OS:
+
+## x86_64
+```
+[settings]
+arch=x86_64
+build_type=Release
+compiler=apple-clang
+compiler.cppstd=gnu17
+compiler.libcxx=libc++
+compiler.version=14
+os=Macos
+os.version=10.13
+```
+
+## armv8
+```
+[settings]
+arch=armv8
+build_type=Release
+compiler=apple-clang
+compiler.cppstd=gnu17
+compiler.libcxx=libc++
+compiler.version=14
+os=Macos
+os.version=11.0
+```
+
+
+#### [Example project](xcode)
+
+
+```
+cd ./xcode
+conan deploy-lipo . -pr x86_64 -pr armv8 -b missing
+conan build .
+```
+
+Verify the architectures:
+```
+file ./build/Release/example
+```

extensions/commands/deploy-lipo/_lipo.py

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+import os
+import shutil
+from subprocess import run
+
+
+__all__ = ['is_macho_binary', 'lipo']
+
+# These are for optimization only, to avoid unnecessarily reading files.
+_binary_exts = ['.a', '.dylib']
+_regular_exts = [
+    '.h', '.hpp', '.hxx', '.c', '.cc', '.cxx', '.cpp', '.m', '.mm', '.txt', '.md', '.html', '.jpg', '.png'
+]
+
+
+def is_macho_binary(filename):
+    ext = os.path.splitext(filename)[1]
+    if ext in _binary_exts:
+        return True
+    if ext in _regular_exts:
+        return False
+    with open(filename, "rb") as f:
+        header = f.read(4)
+        if header == b'\xcf\xfa\xed\xfe':
+            # cffaedfe is Mach-O binary
+            return True
+        elif header == b'\xca\xfe\xba\xbe':
+            # cafebabe is Mach-O fat binary
+            return True
+        elif header == b'!<arch>\n':
+            # ar archive
+            return True
+    return False
+
+
+def copy_arch_file(src, dst, top=None, arch_folders=()):
+    if os.path.isfile(src):
+        if top and arch_folders and is_macho_binary(src):
+            # Try to lipo all available archs on the first path.
+            src_components = src.split(os.path.sep)
+            top_components = top.split(os.path.sep)
+            if src_components[:len(top_components)] == top_components:
+                paths = [os.path.join(a, *(src_components[len(top_components):])) for a in arch_folders]
+                paths = [p for p in paths if os.path.isfile(p)]
+                if len(paths) > 1:
+                    run(['lipo', '-output', dst, '-create'] + paths, check=True)
+                    return
+        if os.path.exists(dst):
+            pass # don't overwrite existing files
+        else:
+            shutil.copy2(src, dst)
+
+
+# Modified copytree to copy new files to an existing tree.
+def graft_tree(src, dst, symlinks=False, copy_function=shutil.copy2, dirs_exist_ok=False):
+    names = os.listdir(src)
+    os.makedirs(dst, exist_ok=dirs_exist_ok)
+    errors = []
+    for name in names:
+        srcname = os.path.join(src, name)
+        dstname = os.path.join(dst, name)
+        try:
+            if symlinks and os.path.islink(srcname):
+                if os.path.exists(dstname):
+                    continue
+                linkto = os.readlink(srcname)
+                os.symlink(linkto, dstname)
+            elif os.path.isdir(srcname):
+                graft_tree(srcname, dstname, symlinks, copy_function, dirs_exist_ok)
+            else:
+                copy_function(srcname, dstname)
+            # What about devices, sockets etc.?
+        # catch the Error from the recursive graft_tree so that we can
+        # continue with other files
+        except shutil.Error as err:
+            errors.extend(err.args[0])
+        except OSError as why:
+            errors.append((srcname, dstname, str(why)))
+    try:
+        shutil.copystat(src, dst)
+    except OSError as why:
+        # can't copy file access times on Windows
+        if why.winerror is None: # pylint: disable=no-member
+            errors.extend((src, dst, str(why)))
+    if errors:
+        raise shutil.Error(errors)
+
+def lipo(dst_folder, arch_folders):
+    for folder in arch_folders:
+        graft_tree(folder,
+                   dst_folder,
+                   symlinks=True,
+                   copy_function=lambda s, d, top=folder: copy_arch_file(s, d,
+                                                                         top=top,
+                                                                         arch_folders=arch_folders),
+                   dirs_exist_ok=True)

extensions/commands/deploy-lipo/cmd_deploy_lipo.py

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+import os
+import shutil
+from subprocess import run
+
+from conan.api.conan_api import ConanAPI
+from conan.api.output import ConanOutput
+from conan.cli.command import conan_command
+from conan.cli.args import common_graph_args
+from conan.errors import ConanException
+
+from _lipo import lipo as lipo_folder
+
+
+_valid_archs = [
+    'x86',
+    'x86_64',
+    'armv7',
+    'armv8',
+    'armv8_32',
+    'armv8.3',
+    'armv7s',
+    'armv7k'
+]
+
+@conan_command(group="Consumer")
+def deploy_lipo(conan_api: ConanAPI, parser, *args):
+    """
+    Deploy dependencies for multiple profiles and lipo into universal binaries
+    """
+    common_graph_args(parser)
+    parsed = parser.parse_args(*args)
+    profiles = parsed.profile_host or parsed.profile
+    if not profiles:
+        raise ConanException("Please provide profiles with -pr or -pr:h")
+    other_args = []
+    i = 0
+    while i < len(args[0]):
+        arg = args[0][i]
+        if arg in ['-pr', '-pr:h', '--profile', '--profile:host']:
+            i += 2
+        else:
+            other_args.append(arg)
+            i += 1
+    for profile in profiles:
+        run(['conan', 'install',
+             '--deploy=full_deploy',
+             '-pr:h', profile
+             ] + other_args)
+    output_dir = os.path.join('full_deploy', 'host')
+    for package in os.listdir(output_dir):
+        package_dir = os.path.join(output_dir, package)
+        for version in os.listdir(package_dir):
+            version_dir = os.path.join(package_dir, version)
+            for build in os.listdir(version_dir):
+                d = os.path.join(version_dir, build)
+                archs = [os.path.join(d, x) for x in os.listdir(d) if x in _valid_archs]
+                # We could skip if len(archs) == 1 but the dir layout would be different
+                lipo_folder(d, archs)
+                for arch in archs:
+                    shutil.rmtree(arch)

extensions/commands/deploy-lipo/xcode/conanfile.py

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+from conan import ConanFile
+from conan.tools.apple import XcodeBuild
+
+
+class UniversalRecipe(ConanFile):
+    # Note that we don't depend on arch
+    settings = "os", "compiler", "build_type"
+    requires = ("libtiff/4.5.0",)
+
+    def build(self):
+        # xcodebuild = XcodeBuild(self)
+        # Don't use XcodeBuild because it passes a single -arch flag
+        build_type = self.settings.get_safe("build_type")
+        project = 'example.xcodeproj'
+        self.run('xcodebuild -configuration {} -project {} -alltargets'.format(build_type, project))