Date: Thu, 12 Jul 2012 23:31:31 +0100 From: Anton Shterenlikht <mexas@bristol.ac.uk> To: freebsd-questions@freebsd.org Subject: profiling library smaller than non-profiling, while it contains more symbols. Why? Message-ID: <20120712223130.GA58047@mech-cluster241.men.bris.ac.uk>
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While updating my port (math/slatec) to use the new OPTIONS framework, I did some experiments with the profiling library. I don't know much about this, so what surprised me is that the profiling library is smaller: # ls -al lib*a -rw-r--r-- 1 root wheel 6582354 Jul 12 22:56 libslatec.a -rw-r--r-- 1 root wheel 6555122 Jul 12 23:02 libslatec_p.a # while it adds .mcount symbol to each object file: # nm libslatec.a > nm # nm libslatec_p.a > nmp # wc nm nmp 16436 36675 373033 nm 17885 39573 413605 nmp 34321 76248 786638 total # grep -c mcount nmp 1449 # expr 16436 + 1449 17885 # Using diff I can confirm that the only difference between the 2 libs is the .mcount symbol for each object file in the profiling library. So how can the profiling library be smaller? -- Anton Shterenlikht Room 2.6, Queen's Building Mech Eng Dept Bristol University University Walk, Bristol BS8 1TR, UK Tel: +44 (0)117 331 5944 Fax: +44 (0)117 929 4423
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