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| # 03:19:48 | imMute | now you wait. |
| # 03:54:06 | herdingcat | hi, what's the usage of sysroot in ct-ng installation directory? Can I install other libs to this place? |
| # 03:54:26 | imMute | herdingcat: you know when you compile things normally how it looks for headers and libraries and stuff? |
| # 03:54:41 | herdingcat | imMute, ah, got it. |
| # 03:54:51 | imMute | the sysroot is where the cross compiler looks for those things. |
| # 03:54:56 | herdingcat | imMute, So I can install other libs I need in that dir.. |
| # 03:55:07 | imMute | so if you want to compile a library to be used by another program, put the headers and library files in the sysroot |
| # 03:55:23 | imMute | (bonus is that you don't have to specify those things when compiling the other program) |
| # 03:55:31 | herdingcat | imMute, got it... :) |
| # 04:03:04 | herdingcat | imMute, it seems I cannot mkdir in sysroot |
| # 04:03:14 | herdingcat | [huli@localhost sysroot]$ pwd |
| # 04:03:15 | herdingcat | /home/huli/Projects/arm-devel-rpi/arm-rpi-linux-gnueabi/sysroot |
| # 04:03:15 | herdingcat | [huli@localhost sysroot]$ mkdir opt |
| # 04:03:15 | herdingcat | mkdir: cannot create directory `opt': Permission denied |
| # 04:03:59 | imMute | permissions |
| # 04:04:35 | imMute | also, you'll want to put the includes in /home/huli/Projects/arm-devel-rpi/arm-rpi-linux-gnueabi/sysroot/usr/include and the libraries in /home/huli/Projects/arm-devel-rpi/arm-rpi-linux-gnueabi/sysroot/usr/lib otherwise the compiler wont find them |
| # 04:06:21 | herdingcat | imMute, because there's no ld.so.config so I need to copy those headers and libs to the default places, right? |
| # 04:06:51 | imMute | ld.so.config has zero interaction when compiling. the places the compiler searches is hardcoded when the compiler was compiled |
| # 04:09:48 | herdingcat | imMute, I installed openmpi so I need to copy those libs to the sysroot, right? |
| # 04:10:26 | imMute | if you indend to compile something that uses that library. also, when you say "installed" did you install using the host computer's pacakge manager? |
| # 04:12:19 | herdingcat | imMute, yes, I use Fedora |
| # 04:12:31 | imMute | then you can't use those when cross compiling |
| # 04:12:45 | imMute | they're compiled for your host computer, which is most likely not ARM |
| # 04:12:56 | herdingcat | imMute, you are right... hmm |
| # 04:13:11 | herdingcat | imMute, So I still need a platform to do compile ARM programs. |
| # 04:13:30 | imMute | you have one - your fedora machine. |
| # 04:17:05 | herdingcat | imMute, I mean, here's my current situation. I have compiled openmpi ARM version in mu x86_64 host and I need to compile other MPI-based programs which using the ARM openmpi libs and binaries. So is that possible? |
| # 04:17:11 | herdingcat | *my |
| # 04:17:44 | imMute | if you compiled the openmpi library using the cross-compiler, then copy the headers and library files to the cross-compiler sysroot, and off you go |
| # 04:19:30 | herdingcat | imMute, but the ARM openmpi binaries are not executable in x86_64. |
| # 04:19:54 | imMute | so? your host system won't be executing the binaries |
| # 04:20:25 | herdingcat | imMute, so the MPI-based programs I wanna compile cannot be generated.. |
| # 04:20:27 | herdingcat | right? |
| # 04:20:32 | imMute | of course they can |
| # 04:21:05 | imMute | the cross compiler can link against libraries that aren't compiled for the host system |
| # 04:21:42 | herdingcat | imMute, cannot executable but can link against libs? |
| # 04:23:01 | imMute | yes, that is the point of a cross-compiler |
| # 04:23:15 | imMute | to link against a library, you don't have to execute anything from that library |
| # 04:27:38 | herdingcat | imMute, that's interesting.... |
| # 04:28:46 | imMute | not really. canadian cross compilers. those are interesting |
| # 04:29:18 | herdingcat | imMute, what's canadian compiler? |
| # 04:30:11 | imMute | a "canadian cross" is a term used to describe a cross compiler that was created on one architecture which targets a second, but intended to be run on a third. Like building the cross compiler on x86 that targets ARM, but the compiler is intended to run on a SPARC system. |
| # 04:32:09 | herdingcat | imMute, is that possible? |
| # 04:32:32 | imMute | possible? definitely. useful? not entirely |
| # 04:33:21 | herdingcat | imMute, hmm, make sense. |
| # 04:33:35 | herdingcat | imMute, ./configure --prefix=/home/huli/Projects/arm-devel-rpi/arm-rpi-linux-gnueabi/sysroot/opt/mpiblast --build=x86_64-redhat-linux --host=armv6-rpi-linux-gnueabi --with-mpi=/home/huli/Projects/arm-devel-rpi/arm-rpi-linux-gnueabi/sysroot/opt/openmpi |
| # 04:34:00 | herdingcat | imMute, then still cannot find the mpicc compiler.. |
| # 04:34:01 | herdingcat | checking for mpicc... no |
| # 04:34:02 | herdingcat | checking for mpicxx... no |
| # 04:34:02 | herdingcat | configure: error: no MPI C compiler found |
| # 04:34:36 | imMute | that seems like openmpi is looking for a special compiler.. I've never used OpenMPI, so I have no idea |
| # 04:36:30 | herdingcat | imMute, following paste would be more interesting: |
| # 04:36:39 | imMute | pastebin it, please. |
| # 04:36:51 | herdingcat | imMute, http://fpaste.org/pCDu/ |
| # 04:37:22 | herdingcat | imMute, "C compiler cannot create executables" |
| # 04:38:05 | imMute | heh, I've seen that before. And I recall it being that the ./configure script forgot that it was cross compiling, and tried to execute something it built (which obviously fails). no idea how to fix that, sorry. |
| # 04:38:47 | herdingcat | imMute, okay.. |
| # 04:41:27 | herdingcat | imMute, thank you very much.. |
| # 04:46:26 | herdingcat | ls -l |
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| # 12:36:50 | smartin | y_morin: hi |
| # 12:38:14 | smartin | any specific reason to restrict CT_LOAD to an integer, and more specifically the -l argument passed to make? |
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| # 13:17:32 | herdingcat | y_morin, hey mate |
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| # 13:40:18 | y_morin | smartin: No, not really. 'load' can indeed be a float. |
| # 13:40:23 | y_morin | herdingcat: howdy? |
| # 13:41:40 | herdingcat | y_morin, I'm good and still working on cross-compile |
| # 13:42:11 | herdingcat | y_morin, I have built up the openmpi well w/ the tool chain but seems cannot compile other MPI-based programs |
| # 13:43:46 | y_morin | herdingcat: waht's the error? |
| # 13:45:04 | herdingcat | y_morin, http://fpaste.org/Af8a/ |
| # 13:45:29 | y_morin | herdingcat: what is the "MPI C compiler found" ? |
| # 13:46:09 | herdingcat | y_morin, that makes me confused, I have installed ARM version openmpi in /home/huli/Projects/arm-devel-rpi/arm-rpi-linux-gnueabi/sysroot/opt/openmpi |
| # 13:46:14 | smartin | y_morin: CT_LOAD could be the percentage of load... |
| # 13:46:25 | herdingcat | y_morin, I think it would find the mpi C compiler |
| # 13:46:41 | herdingcat | y_morin, let me paste config.log |
| # 13:46:47 | herdingcat | y_morin, http://fpaste.org/gOif/ |
| # 13:47:21 | y_morin | smartin: CT_LOAD has to be a value accepted by 'make -l'. |
| # 13:48:21 | smartin | y_morin: yep, something like that: -l$((${CT_LOAD}/100)).$((${CT_LOAD}%100)) |
| # 13:48:27 | y_morin | smartin: as 'make -l' accepts a floating-point number, CT_LOAD can indeed be a float (and not an integer). But we can invent a new meaning to CT_LOAD |
| # 13:48:54 | y_morin | smartin: No, too complex. Just accept that CT_LOAD is passed as-is to 'make -l' |
| # 13:49:06 | smartin | with this, the entry in ct-ng still expect an integer, just the range change |
| # 13:49:32 | y_morin | smartin: kconfig does not have a 'float' type, only integer. The only way is to have CT_LOAD be a string. |
| # 13:50:18 | y_morin | herdingcat: again: what is an 'MPI C compiler' ? |
| # 13:51:02 | herdingcat | y_morin, it's openmpi C compiler. |
| # 13:51:13 | herdingcat | y_morin, do you know openmpi? |
| # 13:51:37 | y_morin | herdingcat: I know MPI only by name. Never used it, even less openmpi. |
| # 13:52:50 | y_morin | herdingcat: I think the underlying issue is that, when you cross-compile openmpi, it cross-compiles everything, even its compiler. What you want is that openmpi cross-compiles only its libraries( if that makes sense), but natively builds its compiler. |
| # 13:52:58 | y_morin | herdingcat: that's an openmpi issue. |
| # 13:53:04 | smartin | y_morin: i know, i see 2 solutions, 1) ask for the percentage (so an integer in kconfig) + some trivial math; 2)ask the actual 'make -l' value (so a string in kconfig) and add some pattern check. |
| # 13:53:51 | y_morin | smartin: definitiely, we want 2). And I don;t care about insane values passed by the user, so no need for a check: the build will fail anyway. |
| # 13:53:58 | smartin | y_morin: don't know which on is the best one, and at the end, it'll be your call ;) |
| # 13:54:11 | y_morin | smartin: we can't protect the user against his/her own foolishnes. |
| # 13:54:46 | smartin | agree |
| # 13:57:06 | herdingcat | y_morin, the program I wanna compile is mpiblast which also needs mpi compiler and libs both.. |
| # 13:57:37 | y_morin | herdingcat: that's an issue with openmpi. Ask them how do properly handle cross-compilation. |
| # 13:57:46 | y_morin | *how to... |
| # 13:57:48 | herdingcat | y_morin, ah okay. |
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