dd8a410eaf
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>
42 lines
1.5 KiB
Makefile
42 lines
1.5 KiB
Makefile
################################################################################
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#
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# environment-setup
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#
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################################################################################
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ENVIRONMENT_SETUP_FILE = $(HOST_DIR)/environment-setup
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define HOST_ENVIRONMENT_SETUP_INSTALL_CMDS
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cp package/environment-setup/environment-setup $(ENVIRONMENT_SETUP_FILE)
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for var in $(TARGET_CONFIGURE_OPTS); do \
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printf "export \"$$var\"\n" >> $(ENVIRONMENT_SETUP_FILE); \
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done
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printf "export \"ARCH=$(NORMALIZED_ARCH)\"\n" >> $(ENVIRONMENT_SETUP_FILE)
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printf "export \"CROSS_COMPILE=$(TARGET_CROSS)\"\n" >> $(ENVIRONMENT_SETUP_FILE)
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printf "export \"CONFIGURE_FLAGS=--target=$(GNU_TARGET_NAME) \
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--host=$(GNU_TARGET_NAME) \
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--build=$(GNU_HOST_NAME) \
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--prefix=/usr \
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--exec-prefix=/usr \
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--sysconfdir=/etc \
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--localstatedir=/var \
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--program-prefix=\"\n" >> $(ENVIRONMENT_SETUP_FILE)
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printf "alias configure=\"./configure \$${CONFIGURE_FLAGS}\"\n" \
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>> $(ENVIRONMENT_SETUP_FILE)
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printf "alias cmake=\"cmake \
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-DCMAKE_TOOLCHAIN_FILE=$(HOST_DIR)/share/buildroot/toolchainfile.cmake \
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-DCMAKE_INSTALL_PREFIX=/usr\"\n" >> $(ENVIRONMENT_SETUP_FILE)
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$(SED) 's%$(HOST_DIR)/bin/%%g' \
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-e 's%$(HOST_DIR)%\$$SDK_PATH%g' \
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-e '/^export "PATH=/c\' \
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$(ENVIRONMENT_SETUP_FILE)
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printf "export \"PATH=\$$SDK_PATH/bin:\$$SDK_PATH/sbin:\$$PATH\"\n" \
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>> $(ENVIRONMENT_SETUP_FILE)
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$(if $(BR2_LINUX_KERNEL),\
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printf "export \"KERNELDIR=$(LINUX_BUILDDIR)\"\n" \
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>> $(ENVIRONMENT_SETUP_FILE),)
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endef
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$(eval $(host-generic-package))
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