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add retpoline compiler and linker feature flags

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These features indicate that the compiler and linker support the
retpoline speculative execution vulnerability (CVE-2017-5715)
mitigation.

Reviewed by:	dim, imp
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D14228
This commit is contained in:
Ed Maste 2018-02-07 14:50:06 +00:00
parent 5b7cc89266
commit 4816408016
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=328972
3 changed files with 16 additions and 7 deletions
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4
Makefile.inc1
View file

@ -165,11 +165,11 @@ test-system-compiler: .PHONY
.if !defined(X_COMPILER_TYPE)
CROSSENV+= COMPILER_VERSION=${COMPILER_VERSION} \
COMPILER_TYPE=${COMPILER_TYPE} \
COMPILER_FEATURES=${COMPILER_FEATURES} \
COMPILER_FEATURES="${COMPILER_FEATURES}" \
COMPILER_FREEBSD_VERSION=${COMPILER_FREEBSD_VERSION}
.else
CROSSENV+= COMPILER_VERSION=${X_COMPILER_VERSION} \
COMPILER_FEATURES=${X_COMPILER_FEATURES} \
COMPILER_FEATURES="${X_COMPILER_FEATURES}" \
COMPILER_TYPE=${X_COMPILER_TYPE} \
COMPILER_FREEBSD_VERSION=${X_COMPILER_FREEBSD_VERSION}
.endif

12
share/mk/bsd.compiler.mk
View file

@ -19,7 +19,9 @@
# COMPILER_FEATURES will contain one or more of the following, based on
# compiler support for that feature:
#
# - c++11 : supports full (or nearly full) C++11 programming environment.
# - c++11: supports full (or nearly full) C++11 programming environment.
# - retpoline: supports the retpoline speculative execution vulnerability
# mitigation.
#
# These variables with an X_ prefix will also be provided if XCC is set.
#
@ -178,11 +180,13 @@ ${X_}COMPILER_FREEBSD_VERSION= unknown
.endif
.endif
${X_}COMPILER_FEATURES=
.if ${${X_}COMPILER_TYPE} == "clang" || \
(${${X_}COMPILER_TYPE} == "gcc" && ${${X_}COMPILER_VERSION} >= 40800)
${X_}COMPILER_FEATURES= c++11
.else
${X_}COMPILER_FEATURES=
${X_}COMPILER_FEATURES+= c++11
.endif
.if ${${X_}COMPILER_TYPE} == "clang" && ${${X_}COMPILER_VERSION} >= 60000
${X_}COMPILER_FEATURES+= retpoline
.endif
.else

7
share/mk/bsd.linker.mk
View file

@ -12,7 +12,9 @@
# 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
# - build-id: support for generating a Build-ID note
# - retpoline: support for generating PLT with retpoline speculative
# execution vulnerability mitigation
#
# These variables with an X_ prefix will also be provided if XLD is set.
#
@ -73,6 +75,9 @@ ${X_}LINKER_FEATURES+= build-id
.if ${${X_}LINKER_TYPE} != "lld" || ${${X_}LINKER_VERSION} >= 50000
${X_}LINKER_FEATURES+= filter
.endif
.if ${${X_}LINKER_TYPE} == "lld" && ${${X_}LINKER_VERSION} >= 60000
${X_}LINKER_FEATURES+= retpoline
.endif
.endif
.else
# Use LD's values