Author: emaste Date: Fri Jun 23 15:57:58 2017 New Revision: 320272 URL: https://svnweb.freebsd.org/changeset/base/320272
Log: 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. Reviewed by: dim MFC after: 3 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D11314 Modified: head/sys/conf/kern.pre.mk head/sys/conf/kmod.mk Modified: head/sys/conf/kern.pre.mk ============================================================================== --- head/sys/conf/kern.pre.mk Fri Jun 23 15:27:23 2017 (r320271) +++ head/sys/conf/kern.pre.mk Fri Jun 23 15:57:58 2017 (r320272) @@ -114,6 +114,10 @@ DEFINED_PROF= ${PROF} # can override the others. 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. LINTFLAGS= ${LINTOBJKERNFLAGS} Modified: head/sys/conf/kmod.mk ============================================================================== --- head/sys/conf/kmod.mk Fri Jun 23 15:27:23 2017 (r320271) +++ head/sys/conf/kmod.mk Fri Jun 23 15:57:58 2017 (r320272) @@ -125,6 +125,10 @@ CFLAGS.gcc+= --param large-function-growth=1000 CFLAGS+= -fno-common LDFLAGS+= -d -warn-common +.if ${LINKER_TYPE} != "bfd" || ${LINKER_VERSION} > 21750 +LDFLAGS+= -Wl,--build-id=sha1 +.endif + CFLAGS+= ${DEBUG_FLAGS} .if ${MACHINE_CPUARCH} == amd64 CFLAGS+= -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
