[Buildroot] Question about pkg-config pc files

[Baruch Siach]

Hi Patricia,

On Fri, Jul 23 2021, Patricia Holden wrote:
> I switched from ti-gfx to ti-sgx, now I get another error:
>
> /home/patricaholden/williamson/build07062021/Pro3-Linux/buildroot-2020.02/output/build/ti-sgx-km-4519ed3b83d1d72207ddc2874c7eb5e5a7f20d8d/eurasia_km/eurasiacon/binary_omap_linux_xorg_release/target_armhf/kbuild/services4/srvkm/env/linux/mm.c:69:10:
> fatal error: linux/dma-direct.h: No such file or directory
>    69 | #include <linux/dma-direct.h>
>       |          ^~~~~~~~~~~~~~~~~~~~
>
>
> I checked linux-headers and only see "include/linux/dma-direction.h", no
> "include/linux/dma-direct.h".

The linux-headers package is for userspace API (uapi) headers that are
part of the toolchain. dma-direction.h is for kernel code. The 'kbuild'
part in the path above indicates that you are building a kernel module.

linux/dma-direct.h was introduced in kernel version 4.16 (commit
ea8c64ace866). But ti-sgx-km commit cf7f48cb30a predates this kernel by
few years. So this it probably a TI kernel that carries the header.

The BR2_PACKAGE_TI_SGX_KM help text says this:

          Note: it needs a TI specific kernel to build properly.

baruch

> Not sure if this is the same file this package is looking for, but just
> renamed.  Looking through config for the kernel to see if I missed
> something.

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