Hi Robbie,
I may need your help to understand ar01 test case under
testcases/commands/ade/ar/.
The following test code may fail, and I don't understand what it does,
# The -s causes regeneration of symbol table even if a symbol table
exists.
# CODE
rm -rf $TCtmp/lib.a;cd $TCdat
ar -cr $TCtmp/lib.a file1.o
crtest
size1=`ls -s $TCtmp/lib.a|(read a b; echo $a)`
strip $TCtmp/lib.a 2>&1 1>/dev/null
ar -ts $TCtmp/lib.a 2>&1 1>/dev/null
size2=`ls -s $TCtmp/lib.a|(read a b; echo $a)`
if [ $size1 -eq $size2 ]
then
echo "-)17"
else
TCRESULT=17
echo "FAIL - ar with -does not regenerate symbol table"
I have two questions. The first one is, why use "t" and "s" options
together?
ar -ts $TCtmp/lib.a 2>&1 1>/dev/null
>From the manpage,
t Display a table listing the contents of archive, or those of the
files listed in member... that are present in the archive.
Normally only the member name is shown; if you also want to see the
modes (permissions), timestamp, owner, group, and size, you can
request that by also specifying the v modifier.
s Write an object-file index into the archive, or update an existing
one, even if no other change is made to the archive. You may use
this modifier flag either with any operation, or alone. Running ar
s on an archive is equivalent to running ranlib on it.
I can't see how they are related. Do you mean "ar -s"?
The second one is, this piece of test code fails for me, and it works
sometimes probably just by dumb luck. It can be explained by the
following,
First, we create an archieve file lib.a by including file1.o.
# ar -cr lib.a file1.o
Second, we get lib.a's block size.
# # ls -s lib.a
8 lib.a
# nm -s lib.a
Archive index:
main in file1.o
file1.o:
0000000000000000 r .LC0
0000000000000000 T main
U puts
Then, we strip its symbols.
# strip lib.a
# ls -s lib.a
8 lib.a
# nm -s lib.a
file1.o:
nm: file1.o: no symbols
Next, use "ar -s" to generate symbol index?
# ar -s lib.a
# ls -s lib.a
8 lib.a
# nm -s lib.a
file1.o:
nm: file1.o: no symbols
Finally, we get lib.a's new block size, and compare with the old one. If
they are same, the test passes. Otherwise, fails.
As you can from the above, there are two things does not make sense to
me,
* the lib.a's block size is the same before and after stripping the
symbols.
* "ar -s" seems have not effect indicating by "nm -s" and "ls -s".
Any pointer?
CAI Qian
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