[Buildroot] [PATCH v2 3/3] package/linux-headers: add support for custom headers
Mark Corbin
mark.corbin at embecosm.com
Thu Aug 23 16:19:30 UTC 2018
Add support for building toolchains against custom headers. Allows
the selection of a manual version, custom tarball or custom git
repository for the kernel headers. This enables toolchains to be
built against custom kernel headers without having to build a full
kernel.
This is particularly useful for new architectures, such as RISC-V
where updated kernel headers may not have made it into the mainline
kernel yet.
Signed-off-by: Mark Corbin <mark.corbin at embecosm.com>
---
package/linux-headers/Config.in.host | 40 ++++++++++-
package/linux-headers/linux-headers.mk | 94 +++++++++++++++-----------
2 files changed, 93 insertions(+), 41 deletions(-)
diff --git a/package/linux-headers/Config.in.host b/package/linux-headers/Config.in.host
index 5c20c997f9..f8f78f90d1 100644
--- a/package/linux-headers/Config.in.host
+++ b/package/linux-headers/Config.in.host
@@ -86,6 +86,23 @@ config BR2_KERNEL_HEADERS_VERSION
URL at kernel.org. Instead, select "Custom tarball" and
specify the right URL directly.
+config BR2_KERNEL_HEADERS_CUSTOM_TARBALL
+ bool "Custom tarball"
+ help
+ This option allows you to specify a URL pointing to a kernel
+ source tarball. This URL can use any protocol recognized by
+ Buildroot, like http://, ftp://, file:// or scp://.
+
+ When pointing to a local tarball using file://, you may want
+ to use a make variable like $(TOPDIR) to reference the root of
+ the Buildroot tree.
+
+config BR2_KERNEL_HEADERS_CUSTOM_GIT
+ bool "Custom Git repository"
+ help
+ This option allows Buildroot to get the Linux kernel source
+ code from a Git repository.
+
endchoice
config BR2_DEFAULT_KERNEL_VERSION
@@ -95,9 +112,27 @@ config BR2_DEFAULT_KERNEL_VERSION
Specify the version you want to use.
E.G.: 3.6.10
+config BR2_KERNEL_HEADERS_CUSTOM_TARBALL_LOCATION
+ string "URL of custom kernel tarball"
+ depends on BR2_KERNEL_HEADERS_CUSTOM_TARBALL
+
+if BR2_KERNEL_HEADERS_CUSTOM_GIT
+
+config BR2_KERNEL_HEADERS_CUSTOM_REPO_URL
+ string "URL of custom repository"
+
+config BR2_KERNEL_HEADERS_CUSTOM_REPO_VERSION
+ string "Custom repository version"
+ help
+ Revision to use in the typical format used by
+ Git/Mercurial/Subversion E.G. a sha id, a tag, branch, ..
+
+endif
+
choice
bool "Custom kernel headers series"
- depends on BR2_KERNEL_HEADERS_VERSION || BR2_KERNEL_HEADERS_AS_KERNEL
+ depends on BR2_KERNEL_HEADERS_VERSION || BR2_KERNEL_HEADERS_AS_KERNEL || \
+ BR2_KERNEL_HEADERS_CUSTOM_TARBALL || BR2_KERNEL_HEADERS_CUSTOM_GIT
help
Specify the kernel headers series you manually selected,
above.
@@ -277,3 +312,6 @@ config BR2_DEFAULT_KERNEL_HEADERS
default "4.16.18" if BR2_KERNEL_HEADERS_4_16
default "4.17.18" if BR2_KERNEL_HEADERS_4_17
default BR2_DEFAULT_KERNEL_VERSION if BR2_KERNEL_HEADERS_VERSION
+ default "custom" if BR2_KERNEL_HEADERS_CUSTOM_TARBALL
+ default BR2_KERNEL_HEADERS_CUSTOM_REPO_VERSION \
+ if BR2_KERNEL_HEADERS_CUSTOM_GIT
diff --git a/package/linux-headers/linux-headers.mk b/package/linux-headers/linux-headers.mk
index 954c6b7978..6bc60d8d74 100644
--- a/package/linux-headers/linux-headers.mk
+++ b/package/linux-headers/linux-headers.mk
@@ -7,27 +7,50 @@
# This package is used to provide Linux kernel headers for the
# internal toolchain backend.
+# Set variables depending on whether we are using headers from a kernel
+# build or a standalone header package.
ifeq ($(BR2_KERNEL_HEADERS_AS_KERNEL),y)
-
+LINUX_HEADERS_CUSTOM_TARBALL = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_TARBALL))
+LINUX_HEADERS_CUSTOM_GIT = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_GIT))
+LINUX_HEADERS_CUSTOM_HG = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_HG))
+LINUX_HEADERS_CUSTOM_SVN = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_SVN))
LINUX_HEADERS_VERSION = $(call qstrip,$(BR2_LINUX_KERNEL_VERSION))
+LINUX_HEADERS_CUSTOM_TARBALL_LOCATION = \
+$(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION))
+LINUX_HEADERS_REPO_URL = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
+else # ! BR2_KERNEL_HEADERS_AS_KERNEL
+LINUX_HEADERS_CUSTOM_TARBALL = $(call qstrip,$(BR2_KERNEL_HEADERS_CUSTOM_TARBALL))
+LINUX_HEADERS_CUSTOM_GIT = $(call qstrip,$(BR2_KERNEL_HEADERS_CUSTOM_GIT))
+LINUX_HEADERS_CUSTOM_HG =
+LINUX_HEADERS_CUSTOM_SVN =
+LINUX_HEADERS_VERSION = $(call qstrip,$(BR2_DEFAULT_KERNEL_HEADERS))
+LINUX_HEADERS_CUSTOM_TARBALL_LOCATION = \
+$(call qstrip,$(BR2_KERNEL_HEADERS_CUSTOM_TARBALL_LOCATION))
+LINUX_HEADERS_REPO_URL = $(call qstrip,$(BR2_KERNEL_HEADERS_CUSTOM_REPO_URL))
+endif # BR2_KERNEL_HEADERS_AS_KERNEL
+
+# Configure tarball filenames.
+ifeq ($(LINUX_HEADERS_CUSTOM_TARBALL),y)
+LINUX_HEADERS_SOURCE = $(notdir $(LINUX_HEADERS_CUSTOM_TARBALL_LOCATION))
+else ifeq ($(LINUX_HEADERS_CUSTOM_GIT)$(LINUX_HEADERS_CUSTOM_HG)$(LINUX_HEADERS_CUSTOM_SVN),y)
+LINUX_HEADERS_SOURCE = linux-$(LINUX_HEADERS_VERSION).tar.gz
+else
+LINUX_HEADERS_SOURCE = linux-$(LINUX_HEADERS_VERSION).tar.xz
+endif
-# Compute LINUX_HEADERS_SOURCE and LINUX_HEADERS_SITE from the configuration
-ifeq ($(BR2_LINUX_KERNEL_CUSTOM_TARBALL),y)
-LINUX_HEADERS_TARBALL = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION))
-LINUX_HEADERS_SITE = $(patsubst %/,%,$(dir $(LINUX_HEADERS_TARBALL)))
-LINUX_HEADERS_SOURCE = $(notdir $(LINUX_HEADERS_TARBALL))
-else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_GIT),y)
-LINUX_HEADERS_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
+# Configure the various kernel source locations.
+ifeq ($(LINUX_HEADERS_CUSTOM_TARBALL),y)
+LINUX_HEADERS_SITE = $(patsubst %/,%,$(dir $(LINUX_HEADERS_CUSTOM_TARBALL_LOCATION)))
+else ifeq ($(LINUX_HEADERS_CUSTOM_GIT),y)
+LINUX_HEADERS_SITE = $(LINUX_HEADERS_REPO_URL)
LINUX_HEADERS_SITE_METHOD = git
-# use same git tarball as linux kernel
-LINUX_HEADERS_SOURCE = linux-$(LINUX_HEADERS_VERSION).tar.gz
-else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_HG),y)
-LINUX_HEADERS_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
+else ifeq ($(LINUX_HEADERS_CUSTOM_HG),y)
+LINUX_HEADERS_SITE = $(LINUX_HEADERS_REPO_URL)
LINUX_HEADERS_SITE_METHOD = hg
-# use same hg tarball as linux kernel
-LINUX_HEADERS_SOURCE = linux-$(LINUX_HEADERS_VERSION).tar.gz
+else ifeq ($(LINUX_HEADERS_CUSTOM_SVN),y)
+LINUX_HEADERS_SITE = $(LINUX_HEADERS_REPO_URL)
+LINUX_HEADERS_SITE_METHOD = svn
else
-LINUX_HEADERS_SOURCE = linux-$(LINUX_HEADERS_VERSION).tar.xz
# In X.Y.Z, get X and Y. We replace dots and dashes by spaces in order
# to use the $(word) function. We support versions such as 4.0, 3.1,
# 2.6.32, 2.6.32-rc1, 3.0-rc6, etc.
@@ -37,13 +60,16 @@ else ifeq ($(findstring x3.,x$(LINUX_HEADERS_VERSION)),x3.)
LINUX_HEADERS_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v3.x
else ifeq ($(findstring x4.,x$(LINUX_HEADERS_VERSION)),x4.)
LINUX_HEADERS_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v4.x
-endif
+endif # x2.6
# release candidates are in testing/ subdir
ifneq ($(findstring -rc,$(LINUX_HEADERS_VERSION)),)
LINUX_HEADERS_SITE := $(LINUX_HEADERS_SITE)/testing
endif # -rc
-endif
+endif # LINUX_HEADERS_CUSTOM_TARBALL
+# Apply any necessary patches if we are using the headers from a kernel
+# build.
+ifeq ($(BR2_KERNEL_HEADERS_AS_KERNEL),y)
LINUX_HEADERS_PATCHES = $(call qstrip,$(BR2_LINUX_KERNEL_PATCH))
# We rely on the generic package infrastructure to download and apply
@@ -53,35 +79,23 @@ LINUX_HEADERS_PATCHES = $(call qstrip,$(BR2_LINUX_KERNEL_PATCH))
LINUX_HEADERS_PATCH = $(filter ftp://% http://% https://%,$(LINUX_HEADERS_PATCHES))
define LINUX_HEADERS_APPLY_LOCAL_PATCHES
- for p in $(filter-out ftp://% http://% https://%,$(LINUX_HEADERS_PATCHES)) ; do \
- if test -d $$p ; then \
- $(APPLY_PATCHES) $(@D) $$p \*.patch || exit 1 ; \
- else \
- $(APPLY_PATCHES) $(@D) `dirname $$p` `basename $$p` || exit 1; \
- fi \
- done
+ for p in $(filter-out ftp://% http://% https://%,$(LINUX_HEADERS_PATCHES)) ; do \
+ if test -d $$p ; then \
+ $(APPLY_PATCHES) $(@D) $$p \*.patch || exit 1 ; \
+ else \
+ $(APPLY_PATCHES) $(@D) `dirname $$p` `basename $$p` || exit 1; \
+ fi \
+ done
endef
LINUX_HEADERS_POST_PATCH_HOOKS += LINUX_HEADERS_APPLY_LOCAL_PATCHES
+endif # BR2_KERNEL_HEADERS_AS_KERNEL
-else # ! BR2_KERNEL_HEADERS_AS_KERNEL
-
-LINUX_HEADERS_VERSION = $(call qstrip,$(BR2_DEFAULT_KERNEL_HEADERS))
-ifeq ($(findstring x2.6.,x$(LINUX_HEADERS_VERSION)),x2.6.)
-LINUX_HEADERS_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v2.6
-else ifeq ($(findstring x3.,x$(LINUX_HEADERS_VERSION)),x3.)
-LINUX_HEADERS_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v3.x
-else ifeq ($(findstring x4.,x$(LINUX_HEADERS_VERSION)),x4.)
-LINUX_HEADERS_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v4.x
-endif
-LINUX_HEADERS_SOURCE = linux-$(LINUX_HEADERS_VERSION).tar.xz
-
-ifeq ($(BR2_KERNEL_HEADERS_VERSION),y)
+# Skip hash checking for custom kernel headers.
+ifeq ($(BR2_KERNEL_HEADERS_VERSION)$(BR2_KERNEL_HEADERS_CUSTOM_TARBALL)$(BR2_KERNEL_HEADERS_CUSTOM_GIT),y)
BR_NO_CHECK_HASH_FOR += $(LINUX_HEADERS_SOURCE)
endif
-endif # ! BR2_KERNEL_HEADERS_AS_KERNEL
-
# linux-headers really is the same as the linux package
LINUX_HEADERS_DL_SUBDIR = linux
@@ -125,7 +139,7 @@ define LINUX_HEADERS_INSTALL_STAGING_CMDS
headers_install)
endef
-ifeq ($(BR2_KERNEL_HEADERS_VERSION)$(BR2_KERNEL_HEADERS_AS_KERNEL),y)
+ifeq ($(BR2_KERNEL_HEADERS_VERSION)$(BR2_KERNEL_HEADERS_AS_KERNEL)$(BR2_KERNEL_HEADERS_CUSTOM_TARBALL)$(BR2_KERNEL_HEADERS_CUSTOM_GIT),y)
define LINUX_HEADERS_CHECK_VERSION
$(call check_kernel_headers_version,\
$(STAGING_DIR),\
--
2.17.1
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