trylink: only prefix libs with -l

If our pkg-config queries pass back a flag like -pthread, the trylink
script will expand that to -l-pthread.  So change trylink to only add
the -l prefix to a value that doesn't have a - prefix already.

Reported-by: thaehaid@incognitomail.org
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

diff --git a/scripts/trylink b/scripts/trylink
index a8b0b2e..e471699 100755 (executable)
--- a/scripts/trylink
+++ b/scripts/trylink
@@ -117,7 +117,7 @@ LDLIBS=`echo "$LDLIBS" | xargs -n1 | sort | uniq | xargs`
 # First link with all libs. If it fails, bail out
 echo "Trying libraries: $LDLIBS"
 # "lib1 lib2 lib3" -> "-llib1 -llib2 -llib3"
-l_list=`echo "$LDLIBS" | sed -e 's/ / -l/g' -e 's/^/-l/' -e 's/^-l$//'`
+l_list=`echo " $LDLIBS " | sed -e 's: \([^- ][^ ]*\): -l\1:g'`
 test "x$l_list" != "x" && l_list="$START_GROUP $l_list $END_GROUP"
 try $CC $CFLAGS $LDFLAGS \
        -o $EXE \
@@ -141,7 +141,7 @@ while test "$LDLIBS"; do
     for one in $LDLIBS; do
        without_one=`echo " $LDLIBS " | sed "s/ $one / /g" | xargs`
        # "lib1 lib2 lib3" -> "-llib1 -llib2 -llib3"
-       l_list=`echo "$without_one" | sed -e 's/ / -l/g' -e 's/^/-l/' -e 's/^-l$//'`
+       l_list=`echo " $without_one " | sed -e 's: \([^- ][^ ]*\): -l\1:g'`
        test x"$l_list" != x"" && l_list="$START_GROUP $l_list $END_GROUP"
        $debug && echo "Trying -l options: '$l_list'"
        try $CC $CFLAGS $LDFLAGS \
@@ -172,7 +172,7 @@ done
 
 # Make the binary with final, minimal list of libs
 echo "Final link with: ${LDLIBS:-<none>}"
-l_list=`echo "$LDLIBS" | sed -e 's/ / -l/g' -e 's/^/-l/' -e 's/^-l$//'`
+l_list=`echo " $LDLIBS " | sed -e 's: \([^- ][^ ]*\): -l\1:g'`
 test "x$l_list" != "x" && l_list="$START_GROUP $l_list $END_GROUP"
 # --verbose gives us gobs of info to stdout (e.g. linker script used)
 if ! test -f busybox_ldscript; then