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Xen: improve build reproducibility
Enable reproducible builds of the hypervisor binaries by defining build variables and setting compiler flags to support this. Signed-off-by: Christopher Clark <christopher.clark6@baesystems.com> Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
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@ -870,6 +870,24 @@ EXTRA_OEMAKE += "ETHERBOOT_ROMS=${STAGING_DIR_HOST}/usr/share/firmware/rtl8139.r
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EXTRA_OEMAKE += "WGET=/bin/false"
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EXTRA_OEMAKE += "GIT=/bin/false"
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# Improve build reproducibility: provide values for build variables.
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def get_build_time_vars(d):
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source_date_epoch = d.getVar('SOURCE_DATE_EPOCH')
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if source_date_epoch is not None:
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import datetime
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utc_datetime = datetime.datetime.utcfromtimestamp(float(source_date_epoch))
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return " XEN_BUILD_DATE=" + utc_datetime.strftime("%Y-%m-%d") + \
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" XEN_BUILD_TIME=" + utc_datetime.strftime("%H:%M:%S")
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return ""
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EXTRA_OEMAKE += "${@['', 'XEN_WHOAMI=${PF} XEN_DOMAIN=${DISTRO} XEN_BUILD_HOST=${PN}-buildhost'] \
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[d.getVar('BUILD_REPRODUCIBLE_BINARIES') == '1']}${@get_build_time_vars(d)}"
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# Improve build reproducibility: compiler flags to remove filesystem differences.
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# Suppress __FILE__ via an alternative builtin.
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CC += "${@['', '-gno-record-gcc-switches -Wno-builtin-macro-redefined -D__FILE__=__VERSION__ ' + \
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'-fdebug-prefix-map=${WORKDIR}=${PN}'] \
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[d.getVar('BUILD_REPRODUCIBLE_BINARIES') == '1']}"
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# check for XSM in package config to allow XSM_ENABLE to be set
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python () {
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pkgconfig = d.getVar('PACKAGECONFIG')
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@ -889,6 +907,15 @@ do_post_patch() {
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# libsystemd-daemon -> libsystemd for newer systemd versions
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sed -i 's#libsystemd-daemon#libsystemd#' ${S}/tools/configure
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# Improve build reproducibility: disable insertion of the build timestamp
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# into the x86 EFI hypervisor binary.
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# binutils should allow a user-supplied timestamp or use SOURCE_DATE_EPOCH
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# for PE but currently does not.
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if [ "${BUILD_REPRODUCIBLE_BINARIES}" = "1" ] ; then
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sed '/^EFI_LDFLAGS = /{a EFI_LDFLAGS += --no-insert-timestamp
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}' -i "${S}/xen/arch/x86/Makefile"
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fi
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}
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addtask post_patch after do_patch before do_configure
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