[ptxdist] [PATCH] kernel: add option to select the zstd host tool

[Philipp Zabel <p.zabel@pengutronix.de>]

To build Zstandard compressed kernels, the zstd host tool is required.
Add a kernel option to select the host-zstd rule.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
---
 platforms/kernel.in | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/platforms/kernel.in b/platforms/kernel.in
index 3c93d9a0e3d0..6f3e3c8cd81c 100644
--- a/platforms/kernel.in
+++ b/platforms/kernel.in
@@ -4,6 +4,7 @@ menuconfig KERNEL
 	bool
 	default y
 	select HOST_U_BOOT_TOOLS	if KERNEL_IMAGE_U || (KERNEL_IMAGE_SIMPLE && ARCH_MICROBLAZE)
+	select HOST_ZSTD		if KERNEL_ZSTD
 	select HOST_XZ			if KERNEL_XZ
 	select HOST_LZOP		if KERNEL_LZOP
 	select HOST_LZ4			if KERNEL_LZ4
@@ -151,6 +152,17 @@ config KERNEL_IMAGE
 	default "Image"   if KERNEL_IMAGE_RAW
 	default "simpleImage.${PTXCONF_KERNEL_IMAGE_SIMPLE_TARGET}.elf" if KERNEL_IMAGE_SIMPLE
 
+config KERNEL_ZSTD
+	prompt "build zstd hosttool"
+	bool
+	help
+	  Select this if you're going to build your kernel compressed
+	  with zstd and your host system is lacking the proper tools
+	  (the "zstd" package).
+
+	  Select this if you're unsure, as it won't hurt. It just
+	  increases the build time.
+
 config KERNEL_XZ
 	prompt "build xz-utils hosttool"
 	bool
-- 
2.20.1


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