On Thu, Jul 12, 2012 at 09:12:32PM -0500, Robert Bonomi wrote: > > From owner-freebsd-questi...@freebsd.org Thu Jul 12 17:34:12 2012 > > Date: Thu, 12 Jul 2012 23:31:31 +0100 > > From: Anton Shterenlikht <me...@bristol.ac.uk> > > To: freebsd-questions@freebsd.org > > Subject: profiling library smaller than non-profiling, > > while it contains more symbols. Why? > > > > 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 > > # > > It it possible that libslatac.a has debggingn symbols, and the profiling > library does not? > > Or that the profiling library was compiled with a lower degree of > optimization ? (many of the 'higher'-level optimizations cause > _larger_, albeit faster, code to be generated) > > Any other differences in compilation flags?
No, the compilation is very straightforward for this library: ===> Building for slatec-4.1 Warning: Object directory not changed from original /usr/ports/math/slatec/work/src gfortran46 -O -Wl,-rpath=/usr/local/lib/gcc46 -c aaaaaa.f *skip ~1400 other files* gfortran46 -O -Wl,-rpath=/usr/local/lib/gcc46 -c zwrsk.f building static slatec library /usr/local/bin/ranlib libslatec.a gfortran46 -pg -O -Wl,-rpath=/usr/local/lib/gcc46 -o aaaaaa.po -c aaaaaa.f *skip ~1400 other files* gfortran46 -pg -O -Wl,-rpath=/usr/local/lib/gcc46 -o zwrsk.po -c zwrsk.f building profiled slatec library /usr/local/bin/ranlib libslatec_p.a gfortran46 -fpic -DPIC -O -Wl,-rpath=/usr/local/lib/gcc46 -o aaaaaa.So -c aaaaaa.f *skip ~1400 other files* gfortran46 -fpic -DPIC -O -Wl,-rpath=/usr/local/lib/gcc46 -o zwrsk.So -c zwrsk.f building shared library libslatec.so.1 # That's all there is. As I mentioned in the original email, the only difference, according to nm(1), between the non-profiling and the profiling library, is that the profiling library contains symbol .mcount (or _mcount, depending on the arch) for each object file. All other symbols are identical. -- 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 _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
