Fix numerous defconfig build failures

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"Thomas" == Thomas Petazzoni <[email protected]> writes:

Hello,
This commit fixes a significant number of defconfig build failures:

- Some defconfigs have a Linux kernel that needs openssl on the host. This requires adding a mechanism to add host-openssl as a dependency of the linux package. This is done by introducing BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL in patch 1.

Then, numerous defconfigs are fixed to use BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL: patches 6 to 13.

The qemu_x86_defconfig and qemu_x86_64_defconfig are however changed in a different way: by removing wireless support, which is the reason why host-openssl becomes necessary in recent kernel versions. Since Qemu doesn't emulate a wireless interface, it didn't make much sense to have this additional dependency. See patch 4 and 5.

For all other defconfigs, we erred on the safe side, and kept the configuration as-is, and simply added BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL.

- Some defconfigs have a Linux kernel that needs libelf on the host. Like host-openssl, we added a new option BR2_LINUX_KERNEL_NEEDS_HOST_LIBELF. See patch 2.

In practice, only qemu_x86_64_defconfig needed libelf and the host, and instead of bringing this dependency, we have disabled the ORC Unwinder from the kernel defconfig. See patch 4.

Therefore, there are no in-tree defconfig that uses BR2_LINUX_KERNEL_NEEDS_HOST_LIBELF.

- In order to make the host openssl and host libelf usable by the Linux kernel build system, we had to ensure that HOST_CFLAGS and HOST_LDFLAGS were properly taken into account. This is done in patch 3.

- Some defconfigs have a U-Boot that needs dtc on the host. For these, the fix is simple: add BR2_TARGET_UBOOT_NEEDS_DTC=y in the defconfig. Patches 14 to 22.

- Finally, one defconfig, ts4900_defconfig, had a separate issue: it wasn't explicitly specifying a kernel version, causing a mismatch with the selected kernel headers version.

Best regards,

Thomas

Thomas Petazzoni (23):
linux: add BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL
linux: add BR2_LINUX_KERNEL_NEEDS_HOST_LIBELF
linux: fix passing of host CFLAGS and LDFLAGS