- fix bug where we linked again -lm even though it is not needed.

  For BBOX_LIB_LIST="crypt m" trylink ... with just applet true, we pulled in
  libm because in this case we tried to use invalid flags (plain "-l" without
  a lib) which of course failed, thus the script thought that -lm was needed.

  The fix is not to pass "-l" without a lib if we are about to check if any
  or the last remaining lib is really needed.

1 files changed, 11 insertions, 2 deletions

diff --git a/scripts/trylink b/scripts/trylink
index 4eaa334d5..69473076b 100755
--- a/scripts/trylink
+++ b/scripts/trylink
@@ -39,8 +39,17 @@ while test "$BBOX_LIB_LIST"; do
     for one in $BBOX_LIB_LIST; do
         without_one=`echo " $BBOX_LIB_LIST " | sed "s/ $one / /g" | xargs`
         l_list=`echo "$without_one" | sed -e 's/ / -l/g' -e 's/^/-l/'`
-        $debug && echo "Trying -l options: $l_list"
-        if try "-Wl,--start-group $l_list -Wl,--end-group" "$@"; then
+        # If l_list is just "-l" without a lib, then make sure to test the
+        # correct thing to fail: just using -l will fail, so the last lib
+        # (usually m in my case) will incorrectly be added as needed.
+        if test "x$without_one" != "x"; then
+                l_list="-Wl,--start-group $l_list -Wl,--end-group"
+        else
+                # without_one is empty, so l_list has to be empty too
+                l_list=""
+        fi
+        $debug && echo "Trying -l options: '$l_list'"
+        if try "$l_list" "$@"; then
                 echo "Library $one is not needed"
                 BBOX_LIB_LIST="$without_one"
                 all_needed=false