On Sat, Dec 10, 2011 at 12:46 AM, Dave Hylands <dhylands@xxxxxxxxx> wrote: > Hi Jim, > > On Fri, Dec 9, 2011 at 10:59 PM, Jim Cromie <jim.cromie@xxxxxxxxx> wrote: >> >> hi folks, >> >> out of habit, I build my kernels to a build tree >> ie use make O=../build-foo just once, >> then cd ../build-foo, and thereafter run make there >> >> this doesnt play nice with objdump -S >> --source >> Display source code intermixed with disassembly, if >> possible. Implies -d. >> >> it seems its not possible unless the source and obj are in the same file. >> GDB manages to find the source, whats missing in objdump ? >> >> FWIW, Id love a micro-tutorial on this, >> anyone know how to display, dissect the obj file, debuginfo etc ? >> or can recommend some on-line tome that gets into it at some breadth and >> depth ? >> many many search hits are for quick Q&A that doesnt get deeper than a >> puddle. > > > So I normally do out of tree builds, but I always run make from the source > tree and specify the O= option. > > I'm using 3.0.1, and in menuconfig, I went into "Kernel hacking", enabled > "Kernel debugging" and then "Compile the kernel with debug info". > > The "Compile the kernel with debug info" option enables CONFIG_DEBUG_INFO > which cause the kernel source to be compiled with the -g option which adds > the debugging information needed to find the source from the objects. > > I normally cross compile for the ARM, so I then cd'd into my build tree and > tried arm-linux-gnueabi-objdump -S on a few object files and they all gave > intermingled C and assembler listings. > > I tried it using your method and it seemed to work fine for me as well. > > -- > Dave Hylands > Shuswap, BC, Canada > http://www.davehylands.com Thanks Dave, Id have sworn that after I found -S to not work out-of-tree, I built in-tree using same .config and -S did work. But of course that in-tree build is gone and I cant verify. (it interferes with continued out-of-tree builds, which end with 'run make mrproper') Anyway, its certainly working now. It was probably a different config on a different box, built for a small CF. thanks again _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
