Improve handling of 'all' architecture recipes and their interaction with sstate

The existing PACKAGE_ARCH = "all" mechanism of sharing packages is problematic
with sstate since there are a variety of variables which have target specific
values and the sstate package therefore correctly changes signature depending
on the MACHINE setting.

This patch creates a new "allarch" class which sets:

PACKAGE_ARCH = "all"

(as per the existing convention)

INHIBIT_DEFAULT_DEPS = "1"

(since its not target specific and therefore can't depend on the cross
compiler or target libc)

TARGET_ARCH = "all"
TARGET_OS = "linux"
TARGET_CC_ARCH = "none"

(since these variables shouldn't change between the different packages and
target compiler flags shouldn't be getting used)

PACKAGE_EXTRA_ARCHS = ""

(since we shouldn't be depending on any architecture specific package architectures)

Not all PACKAGE_ARCH = "all" recipes can use this class since some run configure
checks on the compiler. This means they have target specific components and therefore
the "all" classification is incorrect.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 15 insertions, 0 deletions

diff --git a/meta/classes/allarch.bbclass b/meta/classes/allarch.bbclass
new file mode 100644
index 0000000000..b7c37c3dd1
--- /dev/null
+++ b/meta/classes/allarch.bbclass
@@ -0,0 +1,15 @@
+#
+# This class is used for architecture independent recipes/data files (usally scripts)
+#
+
+PACKAGE_ARCH = "all"
+
+# No need for virtual/libc or a cross compiler
+INHIBIT_DEFAULT_DEPS = "1"
+
+# Set these to a common set of values, we shouldn't be using them other that for WORKDIR directory
+# naming anyway
+TARGET_ARCH = "all"
+TARGET_OS = "linux"
+TARGET_CC_ARCH = "none"
+PACKAGE_EXTRA_ARCHS = ""