Add libgcov, a runtime support library for binaries compiled for basic

block profiling.

gnu/lib/Makefile

@@ -1,6 +1,6 @@
 # $FreeBSD$
 
-SUBDIR= csu libgcc libdialog libregex libreadline
+SUBDIR= csu libgcc libgcov libdialog libregex libreadline
 
 # libsupc++ uses libstdc++ headers, although 'make includes' should
 # have taken care of that already.

gnu/lib/libgcov/Makefile

@@ -0,0 +1,45 @@
+# $FreeBSD$
+
+.include "${.CURDIR}/../../usr.bin/cc/Makefile.tgt"
+
+GCCDIR=	${.CURDIR}/../../../contrib/gcc
+.PATH: ${GCCDIR}/config/${GCC_CPU} ${GCCDIR}
+
+LIB=		gcov
+NOPROFILE=	yes
+
+CFLAGS+=	-DIN_GCC -DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED
+CFLAGS+=	-D_PTHREADS -DGTHREAD_USE_WEAK
+CFLAGS+=	-I${.CURDIR}/../../usr.bin/cc/cc_tools \
+		-I${GCCDIR}/config -I${GCCDIR} -I.
+#
+# Library members defined in libgcov.c.
+SYMS=		_gcov _gcov_merge_add _gcov_merge_delta _gcov_merge_single
+
+OBJS=		${SYMS:S/$/.o/}
+OBJS_T=		${SYMS:S/$/.o/}
+OBJS_P=		${SYMS:S/$/.po/}
+OBJS_S=		${SYMS:S/$/.So/}
+
+COMMONHDRS=	tm.h tconfig.h gcov-iov.h
+CLEANFILES+=	${COMMONHDRS}
+
+${COMMONHDRS}: ${.CURDIR}/../../usr.bin/cc/cc_tools/Makefile
+	${MAKE} -f ${.ALLSRC} MFILE=${.ALLSRC} GCCDIR=${GCCDIR} ${.TARGET}
+
+${OBJS} beforedepend: ${COMMONHDRS}
+
+${OBJS_T}: libgcov.c
+	${CC} -c ${CFLAGS} -DL${.PREFIX} -o ${.TARGET} ${.ALLSRC:M*.c}
+
+.if !defined(NOPIC)
+${OBJS_S}: libgcov.c
+	${CC} -c ${PICFLAG} ${CFLAGS} -DL${.PREFIX} -o ${.TARGET} ${.ALLSRC:M*.c}
+.endif
+
+.if !defined(NOPROFILE)
+${OBJS_P}: libgcc2.c
+	${CC} -c -p ${CFLAGS} -DL${.PREFIX} -o ${.TARGET} ${.ALLSRC:M*.c}
+.endif
+
+.include <bsd.lib.mk>