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package/swupdate: do not store local build details in swupdate config file

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The SWUPDATE_SET_BUILD_OPTIONS macro sets a number of swupdate
configuration options with local build details, especially the
cross-compiler path and sysroot path.

This means that if one stores an swupdate defconfig file as part of
Buildroot, generated with "make swupdate-update-defconfig", it will
contain things like:

CONFIG_CROSS_COMPILE="/home/thomas/projets/buildroot/output/host/bin/arm-linux-"
CONFIG_SYSROOT="/home/thomas/projets/buildroot/output/host/arm-buildroot-linux-uclibcgnueabi/sysroot"

which obviously are not good, as they are specific to where the build
was done.

So instead this commit:

 - Uses the CROSS_COMPILE environment variable to pass the
   cross-compiler path.

 - Drops entirely the use of CONFIG_SYSROOT, since all it does is pass
   a --sysroot option to the compiler, which is not needed in the
   context of Buildroot.

 - Pass EXTRA_CFLAGS/EXTRA_LDFLAGS also through the environment.

Thanks to that the swupdate defconfig file no longer contains any
local build details, and can be re-used by different users of a given
Buildroot configuration.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Thomas Petazzoni 2020-03-06 11:38:39 +01:00 committed by Peter Korsgaard
parent 4f64face1f
commit 716f43153e
1 changed files with 5 additions and 12 deletions
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17
package/swupdate/swupdate.mk
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@ -156,25 +156,18 @@ define SWUPDATE_PREFER_STATIC
endef
endif
define SWUPDATE_SET_BUILD_OPTIONS
$(call KCONFIG_SET_OPT,CONFIG_CROSS_COMPILE,"$(TARGET_CROSS)", \
$(SWUPDATE_BUILD_CONFIG))
$(call KCONFIG_SET_OPT,CONFIG_SYSROOT,"$(STAGING_DIR)", \
$(SWUPDATE_BUILD_CONFIG))
$(call KCONFIG_SET_OPT,CONFIG_EXTRA_CFLAGS,"$(TARGET_CFLAGS)", \
$(SWUPDATE_BUILD_CONFIG))
$(call KCONFIG_SET_OPT,CONFIG_EXTRA_LDFLAGS,"$(TARGET_LDFLAGS)", \
$(SWUPDATE_BUILD_CONFIG))
endef
SWUPDATE_MAKE_OPTS = \
CROSS_COMPILE="$(TARGET_CROSS)" \
CONFIG_EXTRA_CFLAGS="$(TARGET_CFLAGS)" \
CONFIG_EXTRA_LDFLAGS="$(TARGET_LDFLAGS)"
define SWUPDATE_KCONFIG_FIXUP_CMDS
$(SWUPDATE_PREFER_STATIC)
$(SWUPDATE_SET_BUILD_OPTIONS)
$(SWUPDATE_SET_LUA_VERSION)
endef
define SWUPDATE_BUILD_CMDS
$(TARGET_MAKE_ENV) $(SWUPDATE_MAKE_ENV) $(MAKE) -C $(@D)
$(TARGET_MAKE_ENV) $(SWUPDATE_MAKE_ENV) $(MAKE) $(SWUPDATE_MAKE_OPTS) -C $(@D)
endef
define SWUPDATE_INSTALL_TARGET_CMDS