[meta-zephyr][PATCH] zephyr-kernel-src: fix build with latest dtc

[meta-zephyr][PATCH] zephyr-kernel-src: fix build with latest dtc

[Ross Burton]

dtc is now built with Meson, which changes the version string in the
--version output.  Zephyr matches this in a regular expression which now
fails, so update it to match both Make and Meson formats.

Signed-off-by: Ross Burton <ross.burton@arm.com>
---
 recipes-kernel/zephyr-kernel/files/dtc.patch  | 43 +++++++++++++++++++
 .../zephyr-kernel/zephyr-kernel-src-2.7.0.inc |  1 +
 2 files changed, 44 insertions(+)
 create mode 100644 recipes-kernel/zephyr-kernel/files/dtc.patch

diff --git a/recipes-kernel/zephyr-kernel/files/dtc.patch b/recipes-kernel/zephyr-kernel/files/dtc.patch
new file mode 100644
index 0000000..f23a438
--- /dev/null
+++ b/recipes-kernel/zephyr-kernel/files/dtc.patch
@@ -0,0 +1,43 @@
+Upstream-Status: Submitted [https://github.com/zephyrproject-rtos/zephyr/pull/40364]
+Signed-off-by: Ross Burton <ross.burton@arm.com>
+
+From deb6e9b29d77f0d86eb188fb3c5fc6f470277d3d Mon Sep 17 00:00:00 2001
+From: Ross Burton <ross.burton@arm.com>
+Date: Mon, 15 Nov 2021 14:01:47 +0000
+Subject: [PATCH] cmake: expand DTC version regex
+
+DTC can be built with both traditional Makefiles or Meson. When built
+with Makefiles the --version output looks like 'Version: DTC
+1.6.1-dirty' but when built with Meson the output is 'Version: DTC
+v1.6.1+.
+
+This fails to match the version regex and the cmake then fails:
+
+CMake Error at cmake/host-tools.cmake:28 (if):
+  if given arguments:
+    "VERSION_GREATER" "1.4.6"
+  Unknown arguments specified
+
+Expanding the regex with an optional 'v' covers both cases and the build
+succeeds.
+
+Signed-off-by: Ross Burton <ross.burton@arm.com>
+---
+ cmake/host-tools.cmake | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/cmake/host-tools.cmake b/cmake/host-tools.cmake
+index cb7bf2e281..93d33d6390 100644
+--- a/cmake/host-tools.cmake
++++ b/cmake/host-tools.cmake
+@@ -20,7 +20,7 @@ if(DTC)
+     )
+ 
+   if(${dtc_status} EQUAL 0)
+-    string(REGEX MATCH "Version: DTC ([0-9]+[.][0-9]+[.][0-9]+).*" out_var ${dtc_version_output})
++    string(REGEX MATCH "Version: DTC v?([0-9]+[.][0-9]+[.][0-9]+).*" out_var ${dtc_version_output})
+ 
+     # Since it is optional, an outdated version is not an error. If an
+     # outdated version is discovered, print a warning and proceed as if
+-- 
+2.25.1
diff --git a/recipes-kernel/zephyr-kernel/zephyr-kernel-src-2.7.0.inc b/recipes-kernel/zephyr-kernel/zephyr-kernel-src-2.7.0.inc
index a1619a7..db42418 100644
--- a/recipes-kernel/zephyr-kernel/zephyr-kernel-src-2.7.0.inc
+++ b/recipes-kernel/zephyr-kernel/zephyr-kernel-src-2.7.0.inc
@@ -14,4 +14,5 @@ PV = "2.7.0+git${SRCPV}"
 
 SRC_URI:append = " file://0001-cmake-add-yocto-toolchain.patch \
                     file://0001-x86-fix-efi-binary-generation-issue-in-cross-compila.patch \
+                    file://dtc.patch \
                     "
-- 
2.25.1