Add target aarch64_musl_*

I have to mention that adding a new cross compiled target never seems
so simple.

kiwixbuild/dependencies/__init__.py

@@ -5,6 +5,7 @@ from . import (
     android_ndk,
     aria2,
     armhf,
+    arm_musl,
     docoptcpp,
     emsdk,
     flatpak,

kiwixbuild/dependencies/arm_musl.py

@@ -0,0 +1,14 @@
+from .base import Dependency, ReleaseDownload, NoopBuilder
+from kiwixbuild.utils import Remotefile
+
+class aarch64_musl_toolchain(Dependency):
+    dont_skip = True
+    neutral = True
+    name = "aarch64_musl"
+
+    class Source(ReleaseDownload):
+        archive = Remotefile('aarch64-linux-musl-cross.tgz',
+                             'c909817856d6ceda86aa510894fa3527eac7989f0ef6e87b5721c58737a06c38',
+                             'https://musl.cc/aarch64-linux-musl-cross.tgz')
+
+    Builder = NoopBuilder

kiwixbuild/platforms/__init__.py

@@ -4,6 +4,7 @@ from .base import *
 from . import (
     android,
     armhf,
+    arm_musl,
     flatpak,
     i586,
     ios,

kiwixbuild/platforms/arm_musl.py

@@ -0,0 +1,114 @@
+from .base import PlatformInfo, MixedMixin
+
+from kiwixbuild.utils import pj
+from kiwixbuild._global import get_target_step
+
+
+class Aarch64MuslPlatformInfo(PlatformInfo):
+    build = 'aarch64_musl'
+    arch_full = 'aarch64-linux-musl'
+    toolchain_names = ['aarch64_musl']
+    compatible_hosts = ['fedora', 'debian']
+    libdir = "lib/aarch64-linux-musl"
+
+    def get_cross_config(self):
+        return {
+            'binaries': self.binaries,
+            'exe_wrapper_def': '',
+            'root_path': self.root_path,
+            'extra_libs': [],
+            'extra_cflags': ['-I{}'.format(include_dir) for include_dir in self.get_include_dirs()],
+            'host_machine': {
+                'system': 'linux',
+                'lsystem': 'linux',
+                'cpu_family': 'arm',
+                'cpu': 'armhf',
+                'endian': 'little',
+                'abi': ''
+            }
+        }
+
+    @property
+    def tlc_source(self):
+        return get_target_step(self.build, 'source')
+
+    @property
+    def root_path(self):
+        return self.tlc_source.source_path
+
+    @property
+    def binaries(self):
+        binaries = ((k,'{}-{}'.format(self.arch_full, v))
+                for k, v in (('CC', 'gcc'),
+                             ('CXX', 'g++'),
+                             ('AR', 'ar'),
+                             ('STRIP', 'strip'),
+                             ('WINDRES', 'windres'),
+                             ('RANLIB', 'ranlib'),
+                             ('LD', 'ld'),
+                             ('LDSHARED', 'g++ -shared')
+                             )
+               )
+        binaries = {k:pj(self.root_path, 'bin', v)
+                    for k,v in binaries}
+        binaries['PKGCONFIG'] = 'pkg-config'
+        return binaries
+
+    @property
+    def exe_wrapper_def(self):
+        try:
+            which('qemu-arm')
+        except subprocess.CalledProcessError:
+            return ""
+        else:
+            return "exe_wrapper = 'qemu-arm'"
+
+    @property
+    def configure_option(self):
+        return '--host={}'.format(self.arch_full)
+
+    def get_bin_dir(self):
+        return [pj(self.root_path, 'bin')]
+
+    def get_env(self):
+        env = super().get_env()
+        env['LD_LIBRARY_PATH'] = ':'.join([
+            pj(self.root_path, self.arch_full, 'lib64'),
+            pj(self.root_path, 'lib'),
+            env['LD_LIBRARY_PATH']
+        ])
+        env['PKG_CONFIG_LIBDIR'] = pj(self.root_path, 'lib', 'pkgconfig')
+        env['QEMU_LD_PREFIX'] = pj(self.root_path, self.arch_full, "libc")
+        env['QEMU_SET_ENV'] = "LD_LIBRARY_PATH={}".format(
+            ':'.join([
+                pj(self.root_path, self.arch_full, "lib"),
+                env['LD_LIBRARY_PATH']
+        ]))
+        return env
+
+    def set_comp_flags(self, env):
+        super().set_comp_flags(env)
+        env['CFLAGS'] = " -fPIC -Wp,-D_FORTIFY_SOURCE=2 -fexceptions --param=ssp-buffer-size=4 "+env['CFLAGS']
+        env['CXXFLAGS'] = " -fPIC -Wp,-D_FORTIFY_SOURCE=2 -fexceptions --param=ssp-buffer-size=4 "+env['CXXFLAGS']
+
+    def set_compiler(self, env):
+        for k, v in self.binaries.items():
+            env[k] = v
+
+    def finalize_setup(self):
+        super().finalize_setup()
+        self.buildEnv.cmake_crossfile = self._gen_crossfile('cmake_cross_file.txt')
+        self.buildEnv.meson_crossfile = self._gen_crossfile('meson_cross_file.txt')
+
+
+class Aarch64MuslDyn(Aarch64MuslPlatformInfo):
+    name = 'aarch64_musl_dyn'
+    static = False
+
+class Aarch64MuslStatic(Aarch64MuslPlatformInfo):
+    name = 'aarch64_musl_static'
+    static = True
+
+class Aarch64MuslMixed(MixedMixin('aarch64_musl_static'), Aarch64MuslPlatformInfo):
+    name = 'aarch64_musl_mixed'
+    static = False