Author: emaste
Date: Thu Mar 29 12:52:58 2018
New Revision: 331730
URL: https://svnweb.freebsd.org/changeset/base/331730
Log:
MFC kernel build-id support
MFC r320244, r320245, r320246, r320247, r320248, r320249,
r320250 (bdrewery):
Add basic bsd.linker.mk auto included from bsd.compiler.mk.
This will provide LINKER_TYPE and LINKER_VERSION.
Support XLD for setting X_LINKER_TYPE and X_LINKER_VERSION.
This is similar to r300350 for bsd.compiler.mk.
Support cached linker values in environment.
This is similar to r289659 for bsd.compiler.mk.
LINKER_VERSION: Support external binutils.
The ports binutils stores the version in the 5th word so just look for
a version using a pattern instead.
Don't overwrite already-set LINKER_VERSION/LINKER_TYPE.
Provide proper values for X_LINKER_TYPE/VERSION when XLD == LD.
Pass along LINKER_* vars during installworld and show in test-system-compiler.
MFC r320258, r320272, r320275, r320502 (emaste):
change GNU ld LINKER_TYPE from binutils to bfd
GNU binutils includes two linkers: ld.bfd and ld.gold. For clarity use
LINKER_TYPE=bfd to refer to ld.bfd, the original binutils linker that
identifies itself as "GNU ld".
bsd.linker.mk: add band-aid for linker invocation failure
In some cases bsd.linker.mk reports an error like:
make[4]: ".../share/mk/bsd.linker.mk" line 56:
Unknown linker from LD=ld -m elf32ppc_fbsd:"
For now change this to a .warning, and then assume GNU ld 2.17.50.
At present the linker type detection is used only for enabling build-id,
and we can carry on without it when type detection fails.
Also, show errors from ${LD} --version to aid in failure diagnosis.
Successful invocations of ${LD} --version produce no output on stderr
so this will not create any spam in non-failing builds.
enable --build-id for the kernel link
A Build-ID is an identifier generated at link time to uniquely identify
ELF binaries. It allows efficient confirmation that an executable or
shared library and a corresponding standalone debuginfo file match.
(Otherwise, a checksum of the debuginfo file must be calculated when
opening it in a debugger.)
The FreeBSD base system includes GNU bfd ld 2.17.50 as the linker for
architectures other than arm64. Build-ID support was added to bfd ld
shortly after that version, so was not previously available to us.
We can now start making use of Build-ID as we migrate to using lld or
bfd ld from ports, conditionally enabled based on the LINKER_TYPE and
LINKER_VERSION make variables added in r320244 and subsequent commits.
Introduce LINKER_FEATURES to avoid duplicating version logic
MFC r327857 (bdrewery, submitted by Dan McGregor):
Cache LINKER_FEATURES to fix the wrong ones being used.
Sponsored by: Dell EMC Isilon
Sponsored by: The FreeBSD Foundation
Added:
stable/11/share/mk/bsd.linker.mk
- copied, changed from r320244, head/share/mk/bsd.linker.mk
Modified:
stable/11/Makefile.inc1
stable/11/share/mk/Makefile
stable/11/share/mk/bsd.compiler.mk
stable/11/sys/conf/kern.pre.mk
stable/11/sys/conf/kmod.mk
Directory Properties:
stable/11/ (props changed)
Modified: stable/11/Makefile.inc1
==============================================================================
--- stable/11/Makefile.inc1 Thu Mar 29 05:01:49 2018 (r331729)
+++ stable/11/Makefile.inc1 Thu Mar 29 12:52:58 2018 (r331730)
@@ -147,7 +147,8 @@ TEST_SYSTEM_COMPILER_VARS= \
WANT_COMPILER_TYPE WANT_COMPILER_VERSION WANT_COMPILER_VERSION_FILE \
WANT_COMPILER_FREEBSD_VERSION WANT_COMPILER_FREEBSD_VERSION_FILE \
CC COMPILER_TYPE COMPILER_FEATURES COMPILER_VERSION \
- COMPILER_FREEBSD_VERSION
+ COMPILER_FREEBSD_VERSION \
+ LINKER_TYPE LINKER_FEATURES LINKER_VERSION
test-system-compiler: .PHONY
.for v in ${TEST_SYSTEM_COMPILER_VARS}
${_+_}@printf "%-35s= %s\n" "${v}" "${${v}}"
@@ -179,7 +180,10 @@ CROSSENV+= COMPILER_VERSION=${X_COMPILER_VERSION} \
_COMPILER_METADATA_VARS= COMPILER_VERSION \
COMPILER_TYPE \
COMPILER_FEATURES \
- COMPILER_FREEBSD_VERSION
+ COMPILER_FREEBSD_VERSION \
+ LINKER_VERSION \
+ LINKER_FEATURES \
+ LINKER_TYPE
compiler-metadata.mk: .PHONY .META
@: > ${.TARGET}
@echo ".info Using cached compiler metadata from build at $$(hostname)
on $$(date)" \
Modified: stable/11/share/mk/Makefile
==============================================================================
--- stable/11/share/mk/Makefile Thu Mar 29 05:01:49 2018 (r331729)
+++ stable/11/share/mk/Makefile Thu Mar 29 12:52:58 2018 (r331730)
@@ -33,6 +33,7 @@ FILES= \
bsd.kmod.mk \
bsd.lib.mk \
bsd.libnames.mk \
+ bsd.linker.mk \
bsd.links.mk \
bsd.man.mk \
bsd.mkopt.mk \
Modified: stable/11/share/mk/bsd.compiler.mk
==============================================================================
--- stable/11/share/mk/bsd.compiler.mk Thu Mar 29 05:01:49 2018
(r331729)
+++ stable/11/share/mk/bsd.compiler.mk Thu Mar 29 12:52:58 2018
(r331730)
@@ -194,4 +194,5 @@ ${var}.${${X_}_cc_hash}:= ${${var}}
.endif # ${cc} == "CC" || !empty(XCC)
.endfor # .for cc in CC XCC
+.include <bsd.linker.mk>
.endif # !target(__<bsd.compiler.mk>__)
Copied and modified: stable/11/share/mk/bsd.linker.mk (from r320244,
head/share/mk/bsd.linker.mk)
==============================================================================
--- head/share/mk/bsd.linker.mk Thu Jun 22 21:03:20 2017 (r320244, copy
source)
+++ stable/11/share/mk/bsd.linker.mk Thu Mar 29 12:52:58 2018
(r331730)
@@ -9,25 +9,85 @@
# major * 10000 + minor * 100 + tiny
# It too can be overridden on the command line.
#
+# LINKER_FEATURES may contain one or more of the following, based on
+# linker support for that feature:
+#
+# - build-id : support for generating a Build-ID note
+#
+# These variables with an X_ prefix will also be provided if XLD is set.
+#
# This file may be included multiple times, but only has effect the first time.
#
.if !target(__<bsd.linker.mk>__)
__<bsd.linker.mk>__:
-_ld_version!= ${LD} --version 2>/dev/null | head -n 1 || echo none
+.for ld X_ in LD $${_empty_var_} XLD X_
+.if ${ld} == "LD" || !empty(XLD)
+# Try to import LINKER_TYPE and LINKER_VERSION from parent make.
+# The value is only used/exported for the same environment that impacts
+# LD and LINKER_* settings here.
+_exported_vars= ${X_}LINKER_TYPE ${X_}LINKER_VERSION
${X_}LINKER_FEATURES
+${X_}_ld_hash= ${${ld}}${MACHINE}${PATH}
+${X_}_ld_hash:= ${${X_}_ld_hash:hash}
+# Only import if none of the vars are set somehow else.
+_can_export= yes
+.for var in ${_exported_vars}
+.if defined(${var})
+_can_export= no
+.endif
+.endfor
+.if ${_can_export} == yes
+.for var in ${_exported_vars}
+.if defined(${var}.${${X_}_ld_hash})
+${var}= ${${var}.${${X_}_ld_hash}}
+.endif
+.endfor
+.endif
+
+.if ${ld} == "LD" || (${ld} == "XLD" && ${XLD} != ${LD})
+.if !defined(${X_}LINKER_TYPE) || !defined(${X_}LINKER_VERSION)
+_ld_version!= (${${ld}} --version || echo none) | head -n 1
.if ${_ld_version} == "none"
-.error Unable to determine linker type from LD=${LD}
+.warning Unable to determine linker type from ${ld}=${${ld}}
.endif
.if ${_ld_version:[1..2]} == "GNU ld"
-LINKER_TYPE= binutils
-_v= ${_ld_version:[3]}
+${X_}LINKER_TYPE= bfd
+_v= ${_ld_version:M[1-9].[0-9]*:[1]}
.elif ${_ld_version:[1]} == "LLD"
-LINKER_TYPE= lld
+${X_}LINKER_TYPE= lld
_v= ${_ld_version:[2]}
.else
-.error Unknown linker from LD=${LD}: ${_ld_version}
+.warning Unknown linker from ${ld}=${${ld}}: ${_ld_version}, defaulting to bfd
+${X_}LINKER_TYPE= bfd
+_v= 2.17.50
.endif
-LINKER_VERSION!=echo "${_v:M[1-9].[0-9]*}" | awk -F. '{print $$1 * 10000 + $$2
* 100 + $$3;}'
+${X_}LINKER_VERSION!= echo "${_v:M[1-9].[0-9]*}" | \
+ awk -F. '{print $$1 * 10000 + $$2 * 100 + $$3;}'
+.undef _ld_version
+.undef _v
+${X_}LINKER_FEATURES=
+.if ${${X_}LINKER_TYPE} != "bfd" || ${${X_}LINKER_VERSION} > 21750
+${X_}LINKER_FEATURES+= build-id
+.endif
+.endif
+.else
+# Use LD's values
+X_LINKER_TYPE= ${LINKER_TYPE}
+X_LINKER_VERSION= ${LINKER_VERSION}
+X_LINKER_FEATURES= ${LINKER_FEATURES}
+.endif # ${ld} == "LD" || (${ld} == "XLD" && ${XLD} != ${LD})
+
+# Export the values so sub-makes don't have to look them up again, using the
+# hash key computed above.
+.for var in ${_exported_vars}
+${var}.${${X_}_ld_hash}:= ${${var}}
+.export-env ${var}.${${X_}_ld_hash}
+.undef ${var}.${${X_}_ld_hash}
+.endfor
+
+.endif # ${ld} == "LD" || !empty(XLD)
+.endfor # .for ld in LD XLD
+
.endif # !target(__<bsd.linker.mk>__)
Modified: stable/11/sys/conf/kern.pre.mk
==============================================================================
--- stable/11/sys/conf/kern.pre.mk Thu Mar 29 05:01:49 2018
(r331729)
+++ stable/11/sys/conf/kern.pre.mk Thu Mar 29 12:52:58 2018
(r331730)
@@ -109,6 +109,10 @@ DEFINED_PROF= ${PROF}
# can override the others.
CFLAGS+= ${CONF_CFLAGS}
+.if ${LINKER_FEATURES:Mbuild-id}
+LDFLAGS+= -Wl,--build-id=sha1
+.endif
+
# Optional linting. This can be overridden in /etc/make.conf.
LINTFLAGS= ${LINTOBJKERNFLAGS}
Modified: stable/11/sys/conf/kmod.mk
==============================================================================
--- stable/11/sys/conf/kmod.mk Thu Mar 29 05:01:49 2018 (r331729)
+++ stable/11/sys/conf/kmod.mk Thu Mar 29 12:52:58 2018 (r331730)
@@ -125,6 +125,10 @@ CFLAGS.gcc+= --param large-function-growth=1000
CFLAGS+= -fno-common
LDFLAGS+= -d -warn-common
+.if ${LINKER_FEATURES:Mbuild-id}
+LDFLAGS+= -Wl,--build-id=sha1
+.endif
+
CFLAGS+= ${DEBUG_FLAGS}
.if ${MACHINE_CPUARCH} == amd64
CFLAGS+= -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer
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