1 files changed, 115 insertions, 0 deletions
diff --git a/recipes-wam/cef/gn-utils.inc b/recipes-wam/cef/gn-utils.inc
new file mode 100644
index 00000000..34f8a12c
--- /dev/null
+++ b/recipes-wam/cef/gn-utils.inc
@@ -0,0 +1,115 @@
+# GN host architecture helpers.
+#
+# Copied from https://github.com/OSSystems/meta-browser
+#
+# BUILD_ARCH's value corresponds to what uname returns as the machine name.
+# The mapping in gn_host_arch_name() tries to match several possible values
+# returned by the Linux kernel in uname(2) into the corresponding values GN
+# understands.
+
+def gn_host_arch_name(d):
+    """Returns a GN architecture name corresponding to the build host's machine
+    architecture."""
+    import re
+    arch_translations = {
+        r'aarch64.*': 'arm64',
+        r'arm.*': 'arm',
+        r'i[3456]86$': 'x86',
+        r'x86_64$': 'x64',
+    }
+    build_arch = d.getVar("BUILD_ARCH")
+    for arch_regexp, gn_arch_name in arch_translations.items():
+        if re.match(arch_regexp, build_arch):
+            return gn_arch_name
+    bb.fatal('Unsuported BUILD_ARCH value: "%s"' % build_arch)
+
+# GN target architecture helpers.
+#
+# Determining the target architecture is more difficult, as there are many
+# different values we can use on the Yocto side (e.g. TUNE_ARCH, TARGET_ARCH,
+# MACHINEOVERRIDES etc). What we do is define the mapping with regular,
+# non-Python variables with overrides that are generic enough (i.e. "x86"
+# instead of "i586") and then use gn_target_arch_name() to return the right
+# value with some validation.
+GN_TARGET_ARCH_NAME:aarch64 = "arm64"
+GN_TARGET_ARCH_NAME:arm = "arm"
+GN_TARGET_ARCH_NAME:x86 = "x86"
+GN_TARGET_ARCH_NAME:x86-64 = "x64"
+
+def clang_install_path(d):
+    """Return clang compiler install path."""
+    return d.getVar("STAGING_BINDIR_NATIVE")
+
+def gn_target_arch_name(d):
+    """Returns a GN architecture name corresponding to the target machine's
+    architecture."""
+    name = d.getVar("GN_TARGET_ARCH_NAME")
+    if name is None:
+        bb.fatal('Unsupported target architecture. A valid override for the '
+                 'GN_TARGET_ARCH_NAME variable could not be found.')
+    return name
+
+def write_toolchain_file(d, file_path):
+    """Creates a complete GN toolchain file in |file_path|."""
+    import string
+    # Even though we always use clang, the "clang_toolchain" GN template is too
+    # restrictive in the way it sets variables such as |cxx|. Since it is just
+    # a wrapper on top of the "gcc_toolchain" template, we keep using the
+    # latter directly to accommodate our cross-compilation needs.
+    toolchain_tmpl = string.Template(
+        'gcc_toolchain("${toolchain_name}") {\n'
+        '  cc = "${cc}"\n'
+        '  cxx = "${cxx}"\n'
+        '  ar = "${ar}"\n'
+        '  ld = cxx  # GN expects a compiler, not a linker.\n'
+        '  nm = "${nm}"\n'
+        '  readelf = "${readelf}"\n'
+        '  extra_cflags = "${extra_cflags}"\n'
+        '  extra_cppflags = "${extra_cppflags}"\n'
+        '  extra_cxxflags = "${extra_cxxflags}"\n'
+        '  extra_ldflags = "${extra_ldflags}"\n'
+        '  toolchain_args = {\n'
+        '    current_cpu = "${current_cpu}"\n'
+        '    current_os = "linux"\n'
+        '    is_clang = true\n'
+        '  }\n'
+        '}\n'
+    )
+
+    native_toolchain = {
+        'toolchain_name': 'yocto_native',
+        'current_cpu': gn_host_arch_name(d),
+        'cc': d.expand('${BUILD_CC}'),
+        'cxx': d.expand('${BUILD_CXX}'),
+        'ar': d.expand('${BUILD_AR}'),
+        'nm': d.expand('${BUILD_NM}'),
+        'readelf': d.expand('${BUILD_PREFIX}readelf'),
+        'extra_cflags': d.expand('${BUILD_CFLAGS}'),
+        'extra_cppflags': d.expand('${BUILD_CPPFLAGS}'),
+        'extra_cxxflags': d.expand('${BUILD_CXXFLAGS}'),
+        'extra_ldflags': d.expand('${BUILD_LDFLAGS}'),
+    }
+    target_toolchain = {
+        'toolchain_name': 'yocto_target',
+        'current_cpu': gn_target_arch_name(d),
+        'cc': d.expand('${CC}'),
+        'cxx': d.expand('${CXX}'),
+        'ar': d.expand('${AR}'),
+        'nm': d.expand('${NM}'),
+        'readelf': d.expand('${READELF}'),
+        'extra_cflags': d.expand('${CFLAGS}'),
+        'extra_cppflags': d.expand('${CPPFLAGS}'),
+        'extra_cxxflags': d.expand('${CXXFLAGS}'),
+        'extra_ldflags': d.expand('${LDFLAGS}'),
+    }
+
+    with open(file_path, 'w') as toolchain_file:
+        toolchain_file.write(
+            '# This file has been generated automatically.\n'
+            '\n'
+            'import("//build/toolchain/gcc_toolchain.gni")\n'
+            '\n'
+        )
+        toolchain_file.write(toolchain_tmpl.substitute(native_toolchain))
+        toolchain_file.write(toolchain_tmpl.substitute(target_toolchain))
+