From: CAI Qian <[email protected]>
Subject: Help Need for Ar01 Test Case
Date: Mon, 16 Mar 2009 17:32:17 +0800 (CST)
> Hi Robbie,
>
I got delevery failure for Robbie's email address,
Your message
Subject: Help Need for Ar01 Test Case
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Does anybody happen to know his up-to-date email?
CAI Qian
> 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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