python/build/meson: bringt back configure()

This reverts part of commit a3765cd363.
The MesonProject class was not used, but the "configure" function.

python/build/meson.py

@@ -0,0 +1,107 @@
+import os
+import subprocess
+import platform
+
+from .toolchain import AnyToolchain
+
+def __no_ccache(cmd: str) -> str:
+    if cmd.startswith('ccache '):
+        cmd = cmd[7:]
+    return cmd
+
+def make_cross_file(toolchain: AnyToolchain) -> str:
+    if toolchain.is_windows:
+        system = 'windows'
+        windres = "windres = '%s'" % toolchain.windres
+    else:
+        system = 'linux'
+        windres = ''
+
+    if toolchain.is_arm:
+        cpu_family = 'arm'
+        if toolchain.is_armv7:
+            cpu = 'armv7'
+        else:
+            cpu = 'armv6'
+    elif toolchain.is_aarch64:
+        cpu_family = 'aarch64'
+        cpu = 'arm64-v8a'
+    else:
+        cpu_family = 'x86'
+        if 'x86_64' in toolchain.host_triplet:
+            cpu = 'x86_64'
+        else:
+            cpu = 'i686'
+
+    # TODO: support more CPUs
+    endian = 'little'
+
+    # TODO: write pkg-config wrapper
+
+    path = os.path.join(toolchain.build_path, 'meson.cross')
+    os.makedirs(toolchain.build_path, exist_ok=True)
+    with open(path, 'w') as f:
+        f.write(f"""
+[binaries]
+c = '{__no_ccache(toolchain.cc)}'
+cpp = '{__no_ccache(toolchain.cxx)}'
+ar = '{toolchain.ar}'
+strip = '{toolchain.strip}'
+pkgconfig = '{toolchain.pkg_config}'
+""")
+
+        if toolchain.is_windows and platform.system() != 'Windows':
+            f.write(f"windres = '{toolchain.windres}'\n")
+
+            # Run unit tests with WINE when cross-building for Windows
+            print("exe_wrapper = 'wine'", file=f)
+
+        f.write(f"""
+[properties]
+root = '{toolchain.install_prefix}'
+""")
+
+        if toolchain.is_android:
+            f.write("""
+# Keep Meson from executing Android-x86 test binariees
+needs_exe_wrapper = true
+""")
+
+        f.write(f"""
+[built-in options]
+c_args = {repr((toolchain.cppflags + ' ' + toolchain.cflags).split())}
+c_link_args = {repr(toolchain.ldflags.split() + toolchain.libs.split())}
+
+cpp_args = {repr((toolchain.cppflags + ' ' + toolchain.cxxflags).split())}
+cpp_link_args = {repr(toolchain.ldflags.split() + toolchain.libs.split())}
+""")
+
+        f.write(f"""
+[host_machine]
+system = '{system}'
+cpu_family = '{cpu_family}'
+cpu = '{cpu}'
+endian = '{endian}'
+""")
+    return path
+
+def configure(toolchain: AnyToolchain, src: str, build: str, args: list[str]=[]) -> None:
+    configure = [
+        'meson', 'setup',
+        build, src,
+
+        '--prefix', toolchain.install_prefix,
+
+        '--buildtype', 'plain',
+
+        '--default-library=static',
+    ] + args
+
+    if toolchain.host_triplet is not None:
+        # cross-compiling: write a cross-file
+        cross_file = make_cross_file(toolchain)
+        configure.append(f'--cross-file={cross_file}')
+
+    env = toolchain.env.copy()
+
+    subprocess.check_call(configure, env=env)