Re: [Buildroot] [PATCH 1/1] package/dtc: bump version to 1.8.1 and switch to meson build

[Julien Olivain via buildroot <buildroot@buildroot.org>]

Hi Philippe,

Thanks for the patch. I have few comments.

On 05/08/2026 16:17, Philippe MONTCHO wrote:
> Release note:
> https://github.com/dgibson/dtc/releases/tag/v1.8.1

Could you also add a link to the v1.8.0, please?

Release notes, since v1.7.1:
https://github.com/dgibson/dtc/releases/tag/v1.8.0
https://github.com/dgibson/dtc/releases/tag/v1.8.1


> - This commit also removes 0002-fix-discarded-const-qualifiers.patch,
> since it has been merged in v1.8.0 already
> 
> - upstream dtc warns that Makefile-based builds are deprecated in
> favor of Meson after version was updated. So we migrate to Meson build.
> 
> Signed-off-by: Philippe MONTCHO <philippemontcho@gmail.com>
> ---
>  .../0002-fix-discarded-const-qualifiers.patch | 88 -------------------
>  package/dtc/dtc.hash                          |  4 +-
>  package/dtc/dtc.mk                            | 52 ++++-------
>  3 files changed, 17 insertions(+), 127 deletions(-)
>  delete mode 100644 
> package/dtc/0002-fix-discarded-const-qualifiers.patch
[...]
> diff --git a/package/dtc/dtc.mk b/package/dtc/dtc.mk
> index 5b810c6e65..bc4c264a61 100644
> --- a/package/dtc/dtc.mk
> +++ b/package/dtc/dtc.mk
> @@ -4,7 +4,7 @@
>  #
>  
> ################################################################################
> 
> -DTC_VERSION = 1.7.2
> +DTC_VERSION = 1.8.1

This new version is going to be a bit problematic in Buildroot:

Upstream dtc removed the "graph_child_address" checker in:
https://github.com/dgibson/dtc/commit/cba90ce82064ad1e6d25f20d8eaa940bd2fc97ed
first included in v1.8.0.

This option  was introduced some time ago:
https://github.com/dgibson/dtc/commit/df536831d02c51556a8e88cd8da0be0244484156
introduced in v1.4.7.

When dtc is called with an unknown warning option:
dtc -Wno-unknown-warning
it fails with error:
FATAL ERROR: Unrecognized check name "unknown-warning".

U-boot passes this -Wno-graph_child_address option to dtc since:
https://source.denx.de/u-boot/u-boot/-/commit/5972ff077e0f6db36f327f303b0c381f56238ef3
first included in version v2020.07.

U-boot removed it much later in:
https://source.denx.de/u-boot/u-boot/-/commit/b427decccfe983eda4f815ddcf5dcbe733cd04f6
first included in version v2026.07.

And in Buildroot, we pass our host-dtc to U-Boot with DTC=...

If we merge this patch as is, many defconfigs will fail to build
uboot with an error:
FATAL ERROR: Unrecognized check name "graph_child_address"

Maybe we could add a Buildroot specific patch which downgrade
the unknown check error as a warning? See:
https://github.com/dgibson/dtc/blob/v1.8.1/checks.c#L2057

Any opinions?

>  DTC_SOURCE = dtc-$(DTC_VERSION).tar.xz
>  DTC_SITE = https://www.kernel.org/pub/software/utils/dtc
>  DTC_LICENSE = GPL-2.0+ or BSD-2-Clause (library)
> @@ -14,24 +14,25 @@ DTC_INSTALL_STAGING = YES
>  DTC_DEPENDENCIES = host-bison host-flex host-pkgconf
>  HOST_DTC_DEPENDENCIES = host-bison host-flex host-pkgconf
> 
> -DTC_MAKE_OPTS = \
> -	PREFIX=/usr \
> -	NO_PYTHON=1 \
> -	NO_VALGRIND=1
> +DTC_CONF_OPTS = \
> +	--prefix=/usr \

Could you remove this "--prefix" option, please?
It is already set by the pkg-meson.mk infra.

> +	-Dpython=disabled \
> +	-Dvalgrind=disabled \
> +	-Dtests=false
> 
>  # For the host, we install headers in a special subdirectory to avoid
>  # conflicts with the in-kernel libfdt copy.
> -HOST_DTC_MAKE_OPTS = \
> -	PREFIX=$(HOST_DIR) \
> -	INCLUDEDIR=$(HOST_DIR)/include/libfdt \
> -	NO_PYTHON=1 \
> -	NO_VALGRIND=1 \
> -	NO_YAML=1
> +HOST_DTC_CONF_OPTS = \
> +	--prefix=$(HOST_DIR) \

Same comment:
Could you remove this "--prefix" option, please?
It is already set by the pkg-meson.mk infra.

> +	--includedir=$(HOST_DIR)/include/libfdt \
> +	-Dpython=disabled \
> +	-Dvalgrind=disabled \
> +	-Dyaml=disabled
> 
>  ifeq ($(BR2_PACKAGE_LIBYAML),y)
>  DTC_DEPENDENCIES += libyaml

Since the package is now using Meson, could you add here:

DTC_CONF_OPTS += -Dyaml=enabled

>  else
> -DTC_MAKE_OPTS += NO_YAML=1
> +DTC_CONF_OPTS += -Dyaml=disabled
>  endif
> 
>  define DTC_POST_INSTALL_TARGET_RM_DTDIFF
> @@ -52,28 +53,5 @@ DTC_INSTALL_GOAL = install-lib
> 
>  endif # $(BR2_PACKAGE_DTC_PROGRAMS) != y
> 
> -define DTC_BUILD_CMDS
> -	$(TARGET_CONFIGURE_OPTS) $(MAKE) EXTRA_CFLAGS="$(TARGET_CFLAGS) 
> -fPIC" -C $(@D) $(DTC_MAKE_OPTS)
> -endef
> -
> -# For staging, only the library is needed
> -define DTC_INSTALL_STAGING_CMDS
> -	$(TARGET_CONFIGURE_OPTS) $(MAKE) -C $(@D) DESTDIR=$(STAGING_DIR) 
> $(DTC_MAKE_OPTS) install-lib \
> -		install-includes
> -endef
> -
> -define DTC_INSTALL_TARGET_CMDS
> -	$(TARGET_CONFIGURE_OPTS) $(MAKE) -C $(@D) DESTDIR=$(TARGET_DIR) 
> $(DTC_MAKE_OPTS) $(DTC_INSTALL_GOAL)

Since you remove the use of $(DTC_INSTALL_GOAL) here, you
should also remove all other occurrences and the logic
around it in the dtc.mk file.

> -endef
> -
> -# host build
> -define HOST_DTC_BUILD_CMDS
> -	$(HOST_CONFIGURE_OPTS) $(MAKE) EXTRA_CFLAGS="$(HOST_CFLAGS) -fPIC" -C 
> $(@D) $(HOST_DTC_MAKE_OPTS)
> -endef
> -
> -define HOST_DTC_INSTALL_CMDS
> -	$(HOST_CONFIGURE_OPTS) $(MAKE) -C $(@D) $(HOST_DTC_MAKE_OPTS) install
> -endef
> -
> -$(eval $(generic-package))
> -$(eval $(host-generic-package))
> +$(eval $(meson-package))
> +$(eval $(host-meson-package))
> --
> 2.43.0

Could you have a look at those issues, please?

Best regards,

Julien.
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