The variable 'KERNEL_ARCH' is actually a normalized version of
'ARCH'/'BR2_ARCH'. For example, 'arcle' and 'arceb' both become 'arc', just
as all powerpc variants become 'powerpc'.
It is presumably called 'KERNEL_ARCH' because the Linux kernel is typically
the first place where support for a new architecture is added, and thus is
the entity that defines the normalized name.
However, the term 'KERNEL_ARCH' can also be interpreted as 'the architecture
used by the kernel', which need not be exactly the same as 'the normalized
name for a certain arch'. In particular, for cases where a 64-bit
architecture is running a 64-bit kernel but 32-bit userspace. Examples
include:
* aarch64 architecture, with aarch64 kernel and 32-bit (ARM) userspace
* x86_64 architecture, with x86_64 kernel and 32-bit (i386) userspace
In such cases, the 'architecture used by the kernel' needs to refer to the
64-bit name (aarch64, x86_64), whereas all userspace applications need to
refer the, potentially normalized, 32-bit name.
This means that there need to be two different variables:
KERNEL_ARCH: the architecture used by the kernel
NORMALIZED_ARCH: the normalized name for the current userspace architecture
At this moment, both will actually have the same content. But a subsequent
patch will add basic support for situations described above, in which
KERNEL_ARCH may become overwritten to the 64-bit architecture, while
NORMALIZED_ARCH needs to remain the same (32-bit) case.
This commit replaces use of KERNEL_ARCH where actually the userspace arch is
needed. Places that use KERNEL_ARCH in combination with building of kernel
modules are not touched.
There may be cases where a package builds both a kernel module as userspace,
in which case it may need to know about both KERNEL_ARCH and
NORMALIZED_ARCH, for the case where they differ. But this is to be fixed on
a per-need basis.
Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
Reviewed-by: Romain Naour <romain.naour@gmail.com>
[Arnout: Also rename BR2_KERNEL_ARCH to BR2_NORMALIZED_ARCH]
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
environment-setup uses BASH_SOURCE which is bash specific. For other
shells, this variable is empty, leading to an error message and empty
SDK_PATH.
Zsh Uses $0. Unfortunately POSIX is not specifying how exactly $0
should behave when in sourced (or using special dot utility). So other
shell support have to be implemented in different manner.
Signed-off-by: Krzysztof Kanas <kkanas@fastmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Order of the `sed` expressions is important; when this was commited
to master, the order of the expressions from the original patch [1] was
changed, rendering the second expression to noop.
This made all the environment variables from the script to contain
absolute paths: long absolute paths makes verbose builds difficult
to read/follow.
We can take advantage of the fact that the PATH is updated and we
don't have to use absolute paths.
Fixed by reordering the `sed` expresions:
* first update the path of the binaries: e.g. 's%$(HOST_DIR)/bin/%%g'
* only then update remaining paths: e.g. 's%$(HOST_DIR)%\$$SDK_PATH%g'
[1] https://patchwork.ozlabs.org/project/buildroot/patch/20201027140140.47982-1-matthew.weber@rockwellcollins.com/
Signed-off-by: Mircea GLIGA <mgliga@bitdefender.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Exporting ARCH and KERNELDIR makes easier to compile an external kernel
or out of tree kernel modules.
Signed-off-by: Angelo Compagnucci <angelo@amarulasolutions.com>
Reviewed-by: Matt Weber <matthew.weber@rockwellcollins.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
In order to simplify the usage of a buildroot toolchain within
the buildroot shell, a "cmake" alias is provided to call cmake
with the correct toolchain file and options.
Signed-off-by: Angelo Compagnucci <angelo@amarulasolutions.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
In order to simplify the usage of a buildroot toolchain within
the buildroot shell, a "configure" alias is provided to call
./configure with the correct flags.
Signed-off-by: Angelo Compagnucci <angelo@amarulasolutions.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Install an helper script to setup a build environment based on
Buildroot. It's useful when a developer wants to use a Buildroot
generated SDK to build an external project.
Signed-off-by: Angelo Compagnucci <angelo@amarulasolutions.com>
Tested-by: Michael Trimarchi <michael@amarulasolutions.com>
Tested-by: Adam Duskett <aduskett@gmail.com>
Signed-off-by: Maury Anderson <maury.anderson@collins.com>
Signed-off-by: Matt Weber <matthew.weber@rockwellcollins.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
