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scripts/trylink: be more clever when deciding that "lib elimination" has finished:

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Before:
Trying libraries: crypt m resolv
 Library crypt is not needed, excluding it
 Library m is needed, can't exclude it (yet)
 Library resolv is needed, can't exclude it (yet)
 Library m is needed, can't exclude it (yet)
 Library resolv is needed, can't exclude it (yet)
Final link with: m resolv

After:
Trying libraries: crypt m resolv
 Library crypt is not needed, excluding it
 Library m is needed, can't exclude it (yet)
 Library resolv is needed, can't exclude it (yet)
Final link with: m resolv

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2018-11-19 20:36:16 +01:00
parent 4e46b98a45
commit 32511da87d
1 changed files with 9 additions and 12 deletions
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21
scripts/trylink
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@ -149,8 +149,8 @@ try $CC $CFLAGS $LDFLAGS \
# Stop when no lib can be removed.
while test "$LDLIBS"; do
$debug && echo "Trying libraries: $LDLIBS"
all_needed=true
last_needed=false
dropped_non_first_lib=false
first_lib=true
for one in $LDLIBS; do
without_one=`echo " $LDLIBS " | sed "s/ $one / /g" | xargs`
# "lib1 lib2 lib3" -> "-llib1 -llib2 -llib3"
@ -167,20 +167,17 @@ while test "$LDLIBS"; do
if test $? = 0; then
echo " Library $one is not needed, excluding it"
LDLIBS="$without_one"
all_needed=false
last_needed=false
$first_lib || dropped_non_first_lib=true
else
echo " Library $one is needed, can't exclude it (yet)"
last_needed=true
first_lib=false
fi
done
# All libs were needed, can't remove any
$all_needed && break
# Optimization: was the last tried lib needed?
if $last_needed; then
# Was it the only one lib left? Don't test again then.
{ echo "$LDLIBS" | grep -q ' '; } || break
fi
# We can stop trying to drop libs if either all libs were needed,
# or we excluded only the _first_ few.
# (else: we dropped some intermediate lib(s), maybe now we can succeed
# in dropping some of the preceding ones)
$dropped_non_first_lib || break
done
# Make the binary with final, minimal list of libs