tcmode-external-oe-sdk: add tcmode for an oe sdk

Signed-off-by: Christopher Larson <chris_larson@mentor.com>

conf/distro/include/tcmode-external-oe-sdk.inc

@@ -0,0 +1,64 @@
+require conf/distro/include/tcmode-external.inc
+
+TCMODEOVERRIDES .= ":tcmode-external-oe-sdk"
+
+EXTERNAL_TARGET_SYS ?= "${TARGET_SYS}"
+
+EXTERNAL_SDK_SYS ?= "${SDK_SYS}"
+EXTERNAL_TOOLCHAIN_BIN = "${EXTERNAL_TOOLCHAIN}/sysroots/${EXTERNAL_SDK_SYS}/usr/bin/${EXTERNAL_TARGET_SYS}"
+EXTERNAL_MULTIMACH_TARGET_SYS ?= "${MULTIMACH_TARGET_SYS}"
+EXTERNAL_TOOLCHAIN_SYSROOT = "${EXTERNAL_TOOLCHAIN}/sysroots/${EXTERNAL_MULTIMACH_TARGET_SYS}"
+
+EXTERNAL_CC = "${EXTERNAL_TARGET_SYS}-gcc --sysroot=${EXTERNAL_TOOLCHAIN_SYSROOT}"
+EXTERNAL_TOOLCHAIN_FEATURES_append = " locale-utf8-is-default"
+
+# Our headers are already multilib
+oe_multilib_header_pn-glibc-external = ":"
+
+python extract_env_setup_metadata() {
+    import pathlib
+    import subprocess
+
+    external_toolchain = pathlib.Path(d.getVar('EXTERNAL_TOOLCHAIN'))
+    if external_toolchain.is_absolute() and external_toolchain.is_dir():
+        setup = d.getVar('EXTERNAL_TOOLCHAIN_SETUP_SCRIPT')
+        if setup:
+            setup = pathlib.Path(setup)
+        else:
+            arch = d.getVar('TUNE_PKGARCH')
+            setups = external_toolchain.glob('environment-setup-' + arch + '-*')
+            if not setups:
+                bb.fatal('tcmode-external-oe-sdk: failed to determine setup script path for sdk at {}, please set EXTERNAL_TOOLCHAIN_SETUP_SCRIPT to the full path to the environment setup script.'.format(external_toolchain))
+            else:
+                setups = list(setups)
+                if len(setups) > 1:
+                    bb.fatal('tcmode-external-oe-sdk: multiple setup scripts available at {}, please specify the path in EXTERNAL_TOOLCHAIN_SETUP_SCRIPT'.format(external_toolchain))
+                else:
+                    setup = setups[0]
+
+        env = parse_setup_script(setups[0])
+        target_sys = env.get('TARGET_PREFIX')[:-1]
+        native_sysroot = pathlib.Path(env.get('OECORE_NATIVE_SYSROOT'))
+
+        d.setVar('EXTERNAL_TARGET_SYS', str(target_sys))
+        d.setVar('EXTERNAL_TOOLCHAIN_BIN', str(native_sysroot / 'usr' / 'bin' / target_sys))
+        d.setVar('EXTERNAL_TOOLCHAIN_SYSROOT', env.get('SDKTARGETSYSROOT'))
+}
+extract_env_setup_metadata[eventmask] = "bb.event.ConfigParsed"
+addhandler extract_env_setup_metadata
+
+def parse_setup_script(setup):
+    import shlex
+    import subprocess
+
+    with open(setup, 'r') as f:
+        value = f.read()
+
+    values = {}
+    for line in value.splitlines():
+        if line.split():
+            split = shlex.split(line)
+            if split and split[0] == 'export':
+                k, v = split[1].split('=', 1)
+                values[k] = v
+    return values