>As you found, there's no option for renaming libraries, only programs. It's not very helpful that configure --help returns this as an option when it doesn't work!
>The simplest way to avoid conflicts is to build and install to a different target directory, e.g. ./configure --prefix=/opt/gsl-1.13-debug Forgive me but this is not an elegant solution. Having files with the same names is a recipe for mix-up. In fact, running configure with the --libdir=/usr/local/lib-dbg option to specify a different install directory for the libs seems a better bet since you don't get duplicate copies of the include files, etc. >The situation is that GNU packages always compile with debugging (-g -O2) by default... I have been using GSL for a number of years and this is a revelation to me! I never knew that. This is indeed a worthy inclusion in the INSTALL file. The corollary is: How do you build a release version for production runs? Can I suggest this too should be added to the INSTALL file as the release build runs at least 20% faster, methinks. >This is a commendable philosophy which, unfortunately, does not work in practice... I agree with Leo! The default library (-g -O2) does not seem to debug properly. When I tried stepping into a GSL routine with what I now know was this configuration, GDB went to line 1, then line 6, then back to line 2, then 3, then back to 1... I now realise that I got it to work properly with just the -g option (no -O2 option). I have always regarded the debug and optimisation options as a dangerous mix, whatever the compiler. (I seem to recall they are incompatible options in MSVC++? Or at very least, inlining is ignored in the debug build.) In fact, I have discovered that giving configure the CFLAGS= option overrides the the internal '-g -O2' option. So I would suggest building: 1) With CFLAGS='-g' and --libdir=/usr/local/lib-dbg to get a debug version installed in /usr/local/lib-dbg 2) With CFLAGS='-O2' for the release build, and putting this in the default /usr/local/lib. (But I still think it's bad practice to have different libraries with the same names! Can anyone who knows autoconf suggest a solution?) For information, libgsl.a with the '-O2' option is 2896006 bytes, with '-g' it's 6527236 bytes, and with '-g -O2' it's 8283822 bytes. NB. The significant difference the -O2' option makes to the debug build, presumably (as Leo says) due to extensive inlining. _______________________________________________ Help-gsl mailing list Help-gsl@gnu.org http://lists.gnu.org/mailman/listinfo/help-gsl
