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enable --build-id for the kernel link

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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.

Reviewed by:	dim
MFC after:	3 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D11314
This commit is contained in:
Ed Maste 2017-06-23 15:57:58 +00:00
parent 4d17a48343
commit 53e0bebaca
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=320272
2 changed files with 8 additions and 0 deletions
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4
sys/conf/kern.pre.mk
View File

@ -114,6 +114,10 @@ DEFINED_PROF= ${PROF}
# can override the others. # can override the others.
CFLAGS+= ${CONF_CFLAGS} CFLAGS+= ${CONF_CFLAGS}
.if ${LINKER_TYPE} != "bfd" || ${LINKER_VERSION} > 21750
LDFLAGS+= -Wl,--build-id=sha1
.endif
# Optional linting. This can be overridden in /etc/make.conf. # Optional linting. This can be overridden in /etc/make.conf.
LINTFLAGS= ${LINTOBJKERNFLAGS} LINTFLAGS= ${LINTOBJKERNFLAGS}

4
sys/conf/kmod.mk
View File

@ -125,6 +125,10 @@ CFLAGS.gcc+= --param large-function-growth=1000
CFLAGS+= -fno-common CFLAGS+= -fno-common
LDFLAGS+= -d -warn-common LDFLAGS+= -d -warn-common
.if ${LINKER_TYPE} != "bfd" || ${LINKER_VERSION} > 21750
LDFLAGS+= -Wl,--build-id=sha1
.endif
CFLAGS+= ${DEBUG_FLAGS} CFLAGS+= ${DEBUG_FLAGS}
.if ${MACHINE_CPUARCH} == amd64 .if ${MACHINE_CPUARCH} == amd64
CFLAGS+= -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer CFLAGS+= -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer