[PATCH v5 1/5] do not crossbuild SDK for host-arch eq dist-arch

[Felix Moessbauer <felix.moessbauer@siemens.com>]

This patch adds logic to detect when ISAR_CROSS_COMPILE
is set, but host-arch equals dist-arch.
In this case, we do not add the crossbuild-essential package,
but instead add the build-essential one.

To implement this, we transfer the existing logic into a
anonymous python function to make it better readable.

Signed-off-by: Felix Moessbauer <felix.moessbauer@siemens.com>
---
 meta/classes/sdk.bbclass | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/meta/classes/sdk.bbclass b/meta/classes/sdk.bbclass
index 32ee2de7..f42a2ba1 100644
--- a/meta/classes/sdk.bbclass
+++ b/meta/classes/sdk.bbclass
@@ -41,8 +41,18 @@ SDK_PREINSTALL += " \
     devscripts \
     equivs"
 
-TOOLCHAIN = "${@'crossbuild-essential-${DISTRO_ARCH}' if d.getVar('ISAR_CROSS_COMPILE', True) == '1' else 'build-essential'}"
-TOOLCHAIN_append_compat-arch = " crossbuild-essential-${COMPAT_DISTRO_ARCH}"
+# Choose the correct toolchain: cross or native
+python __anonymous() {
+    mode = d.getVar('ISAR_CROSS_COMPILE', True)
+    distro_arch = d.getVar('DISTRO_ARCH')
+    if mode == "0" or d.getVar('HOST_ARCH') ==  distro_arch:
+        toolchain = "build-essential"
+    else:
+        toolchain = "crossbuild-essential-" + distro_arch
+    if d.getVar('ISAR_ENABLE_COMPAT_ARCH', True) == "1":
+        toolchain += " crossbuild-essential-" + d.getVar('COMPAT_DISTRO_ARCH')
+    d.setVar('TOOLCHAIN', toolchain)
+}
 
 # rootfs/image overrides for the SDK
 ROOTFS_ARCH_class-sdk = "${HOST_ARCH}"
-- 
2.30.2