Hi Jeroen / sage-devel, Here is a demo of how I think we should go about to override malloc(), and perhaps others, on OSX. As a quick background reminder, due to the two-level namespace on OSX it is not as easy as LD_PRELOAD'ing a shared library on Linux and other unices.
On OSX, we need to specify the preloaded library at link time. The GCC wrapper does most of the annoying stuff. Tested on bsd.math, and a virtual OSX 10.6. First, obtain and install the gcc wrapper: wget http://www.stp.dias.ie/~vbraun/Sage/gccwrapper-1.0.tar.gz tar xzf gccwrapper-1.0.tar.gz cd gccwrapper-1.0 ./configure --prefix=`pwd`/build make make install PATH=`pwd`/build/bin:$PATH export PATH Then make a simple executable / dylib, an example is packaged in the "test" directory: cd test make ./local/bin/example Note that "example" finds its library "libexample.1.dylib" in the ./local/lib directory since the gcc wrapper set its rpath (via the install_name mechanism on OSX). Now build the same program with a preloaded libpreload.1.dylib: make clean make libpreload.dylib GCCWRAP_LDFLAGS=-L.,-lpreload make ./local/bin/example Note that libpreload intercepts malloc and printf calls from main.c (example) and library.c (libexample.1.dylib) -Volker -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
