[gnome-continuous-yocto/gnomeostree-3.28-rocko: 6028/8267] module.bbclass: Add devshell support

[Emmanuele Bassi <ebassi src gnome org>]

commit 909b50bb6cb6e3a13ac89753ab0f235fdf862524
Author: Stefan Wiehler <stefan wiehler missinglinkelectronics com>
Date:   Fri May 5 17:01:06 2017 +0200

    module.bbclass: Add devshell support
    
    Adds development shell support for out-of-tree kernel modules by reproducing
    the build environment of the compile task.
    
    (From OE-Core rev: 08e366a386caab547e0dbcad2d4ee08f44814262)
    
    Signed-off-by: Stefan Wiehler <stefan wiehler missinglinkelectronics com>
    Signed-off-by: Richard Purdie <richard purdie linuxfoundation org>

 meta/classes/module.bbclass |   20 ++++++++++++++++++++
 1 files changed, 20 insertions(+), 0 deletions(-)
---
diff --git a/meta/classes/module.bbclass b/meta/classes/module.bbclass
index 802476b..391776d 100644
--- a/meta/classes/module.bbclass
+++ b/meta/classes/module.bbclass
@@ -18,6 +18,26 @@ python __anonymous () {
     d.setVar('KBUILD_EXTRA_SYMBOLS', " ".join(extra_symbols))
 }
 
+python do_devshell_prepend () {
+    os.environ['CFLAGS'] = ''
+    os.environ['CPPFLAGS'] = ''
+    os.environ['CXXFLAGS'] = ''
+    os.environ['LDFLAGS'] = ''
+
+    os.environ['KERNEL_PATH'] = d.getVar('STAGING_KERNEL_DIR')
+    os.environ['KERNEL_SRC'] = d.getVar('STAGING_KERNEL_DIR')
+    os.environ['KERNEL_VERSION'] = d.getVar('KERNEL_VERSION')
+    os.environ['CC'] = d.getVar('KERNEL_CC')
+    os.environ['LD'] = d.getVar('KERNEL_LD')
+    os.environ['AR'] = d.getVar('KERNEL_AR')
+    os.environ['O'] = d.getVar('STAGING_KERNEL_BUILDDIR')
+    kbuild_extra_symbols = d.getVar('KBUILD_EXTRA_SYMBOLS')
+    if kbuild_extra_symbols:
+        os.environ['KBUILD_EXTRA_SYMBOLS'] = kbuild_extra_symbols
+    else:
+        os.environ['KBUILD_EXTRA_SYMBOLS'] = ''
+}
+
 module_do_compile() {
        unset CFLAGS CPPFLAGS CXXFLAGS LDFLAGS
        oe_runmake KERNEL_PATH=${STAGING_KERNEL_DIR}   \