svn commit: r328972 - in head: . share/mk

[Ed Maste]

Author: emaste
Date: Wed Feb  7 14:50:06 2018
New Revision: 328972
URL: https://svnweb.freebsd.org/changeset/base/328972

Log:
  add retpoline compiler and linker feature flags
  
  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

Modified:
  head/Makefile.inc1
  head/share/mk/bsd.compiler.mk
  head/share/mk/bsd.linker.mk

Modified: head/Makefile.inc1
==============================================================================
--- head/Makefile.inc1	Wed Feb  7 12:12:06 2018	(r328971)
+++ head/Makefile.inc1	Wed Feb  7 14:50:06 2018	(r328972)
@@ -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

Modified: head/share/mk/bsd.compiler.mk
==============================================================================
--- head/share/mk/bsd.compiler.mk	Wed Feb  7 12:12:06 2018	(r328971)
+++ head/share/mk/bsd.compiler.mk	Wed Feb  7 14:50:06 2018	(r328972)
@@ -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

Modified: head/share/mk/bsd.linker.mk
==============================================================================
--- head/share/mk/bsd.linker.mk	Wed Feb  7 12:12:06 2018	(r328971)
+++ head/share/mk/bsd.linker.mk	Wed Feb  7 14:50:06 2018	(r328972)
@@ -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.
 #
@@ -72,6 +74,9 @@ ${X_}LINKER_FEATURES+=	build-id
 .endif
 .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