Index: head/lib/clang/Makefile.inc
===================================================================
--- head/lib/clang/Makefile.inc
+++ head/lib/clang/Makefile.inc
@@ -0,0 +1,9 @@
+# $FreeBSD$
+
+.include <bsd.compiler.mk>
+
+.if ${COMPILER_TYPE} == "clang"
+DEBUG_FILES_CFLAGS= -gline-tables-only
+.else
+DEBUG_FILES_CFLAGS= -g1
+.endif
Index: head/share/mk/bsd.lib.mk
===================================================================
--- head/share/mk/bsd.lib.mk
+++ head/share/mk/bsd.lib.mk
@@ -69,8 +69,8 @@
 
 .if ${MK_DEBUG_FILES} != "no" && empty(DEBUG_FLAGS:M-g) && \
     empty(DEBUG_FLAGS:M-gdwarf*)
-SHARED_CFLAGS+= -g
-SHARED_CXXFLAGS+= -g
+CFLAGS+= ${DEBUG_FILES_CFLAGS}
+CXXFLAGS+= ${DEBUG_FILES_CFLAGS}
 CTFFLAGS+= -g
 .endif
 
Index: head/share/mk/bsd.prog.mk
===================================================================
--- head/share/mk/bsd.prog.mk
+++ head/share/mk/bsd.prog.mk
@@ -39,7 +39,7 @@
 .else
 .if ${MK_DEBUG_FILES} != "no" && empty(DEBUG_FLAGS:M-g) && \
     empty(DEBUG_FLAGS:M-gdwarf-*)
-CFLAGS+= -g
+CFLAGS+= ${DEBUG_FILES_CFLAGS}
 CTFFLAGS+= -g
 .endif
 .endif
Index: head/share/mk/bsd.sys.mk
===================================================================
--- head/share/mk/bsd.sys.mk
+++ head/share/mk/bsd.sys.mk
@@ -212,6 +212,10 @@
 CFLAGS+=	${SSP_CFLAGS}
 .endif # SSP && !ARM && !MIPS
 
+# Additional flags passed in CFLAGS and CXXFLAGS when MK_DEBUG_FILES is
+# enabled.
+DEBUG_FILES_CFLAGS?= -g
+
 # Allow user-specified additional warning flags, plus compiler and file
 # specific flag overrides, unless we've overriden this...
 .if ${MK_WARNS} != "no"
Index: head/usr.bin/clang/Makefile.inc
===================================================================
--- head/usr.bin/clang/Makefile.inc
+++ head/usr.bin/clang/Makefile.inc
@@ -2,4 +2,12 @@
 
 WARNS?=		0
 
+.include <bsd.compiler.mk>
+
+.if ${COMPILER_TYPE} == "clang"
+DEBUG_FILES_CFLAGS= -gline-tables-only
+.else
+DEBUG_FILES_CFLAGS= -g1
+.endif
+
 .include "../Makefile.inc"