classes/kernel: check OLDEST_KERNEL at configure time

If the kernel being built is older than OLDEST_KERNEL and we're building
with glibc, then the C library we're building is probably not going to
be compatible with the kernel and we should warn the user. (This is
easier to do here rather than when building glibc, because we don't
necessarily have the information we need to determine the kernel version
there, whereas we do here.)

Fixes [YOCTO #8653].

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>

diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass
index 75450ce1a099d771a7a99d38c733666078abebba..c5355cf37e5e6ae2315d451afb81fb7828a6673f 100644 (file)
--- a/meta/classes/kernel.bbclass
+++ b/meta/classes/kernel.bbclass
@@ -326,6 +326,20 @@ sysroot_stage_all () {
 
 KERNEL_CONFIG_COMMAND ?= "oe_runmake_call -C ${S} O=${B} oldnoconfig || yes '' | oe_runmake -C ${S} O=${B} oldconfig"
 
+python check_oldest_kernel() {
+    oldest_kernel = d.getVar('OLDEST_KERNEL', True)
+    kernel_version = d.getVar('KERNEL_VERSION', True)
+    tclibc = d.getVar('TCLIBC', True)
+    if tclibc == 'glibc':
+        kernel_version = kernel_version.split('-', 1)[0]
+        if oldest_kernel and kernel_version:
+            if bb.utils.vercmp_string(kernel_version, oldest_kernel) < 0:
+                bb.warn('%s: OLDEST_KERNEL is "%s" but the version of the kernel you are building is "%s" - therefore %s as built may not be compatible with this kernel. Either set OLDEST_KERNEL to an older version, or build a newer kernel.' % (d.getVar('PN', True), oldest_kernel, kernel_version, tclibc))
+}
+
+check_oldest_kernel[vardepsexclude] += "OLDEST_KERNEL KERNEL_VERSION"
+do_configure[prefuncs] += "check_oldest_kernel"
+
 kernel_do_configure() {
        # fixes extra + in /lib/modules/2.6.37+
        # $ scripts/setlocalversion . => +