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| 13:34.25 | davis | hello |
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| 13:37.21 | davis | ive been trying to get this cmake based code to work with yocto/oe for some time. |
| 13:37.42 | davis | i really don't know if I'm working on it the right way. |
| 13:38.14 | davis | my problem is that this cmake project is kind of like a two stage build. |
| 13:38.27 | davis | you run cmake and it builds makefiles. |
| 13:38.48 | davis | these makefiles take xml files and builds executables. |
| 13:39.01 | davis | these executables are run and they generate new .cpp files. |
| 13:39.30 | davis | later the cmake generated makefiles will build the final exes from the generated .cpp files. |
| 13:40.31 | davis | so i thought i could work this problem by building the code with two recipes. the first recipe would build the entire project as a HOST/NATIVE build |
| 13:41.28 | davis | i'm not sure of syntax nomenclature, but I think it would be considered a host or native build. |
| 13:42.08 | davis | but it so that bitbake can build the code so it can run on the host. It can run those generator programs during make to build the exes |
| 13:42.33 | rburton1 | iirc cmake has built-in support for "use this compiler to generate code that i can run on the build host" vs "use this compiler to generate code for the target" |
| 13:42.36 | rburton1 | which is basically what you want |
| 13:44.12 | davis | cmake has a cross_compiling flag, which is set to false when I build this code standalone outside of bitbake. |
| 13:44.28 | davis | but when I run in bitbake it gets set true. |
| 13:44.44 | rburton1 | yes |
| 13:44.48 | rburton1 | because you're cross compiling |
| 13:44.59 | davis | anyway, so I was able to get bitbake to build this code as native. |
| 13:45.14 | rburton1 | yes because then you are not cross compiling |
| 13:45.39 | rburton1 | hm maybe i'm thinking of meson |
| 13:45.44 | rburton1 | and cmake just doesn't support this easily |
| 13:45.46 | davis | i had messed up and made a recipe with -native suffix. |
| 13:45.47 | rburton1 | (cos cmake sucks) |
| 13:46.12 | davis | rburton1: trust me. I know cmake sucks. but I'm trying to help people out who like it. |
| 13:46.30 | rburton1 | https://cmake.org/Wiki/CMake_Cross_Compiling#Using_executables_in_the_build_created_during_the_build |
| 13:46.56 | rburton1 | that's the hack to build binaries that are needed to run in the build |
| 13:47.13 | davis | so anyway, I had this native cmake project working. I got to 100% in my do_compile task and was able to install just the exe's i needed to the x86_64 sysroot |
| 13:47.15 | rburton1 | so yeah you want a native recipe that builds those tools and installs them, then a target build that depends on the native recipe and uses the tools |
| 13:47.31 | davis | rburton1: you are a smart man. that is exactly the plan. |
| 13:47.57 | davis | but when I got over to the target recepe work, the cmake build during make was failing again. |
| 13:48.19 | davis | it was odd, it was failing because it could not find these exes which it needed to use. |
| 13:48.35 | rburton1 | generally you'll need to fiddle the cmake so that there is a way to say "don't build these tools, use them from <some path>" |
| 13:48.45 | davis | i was confused. they are in the sysroot, why cant it not find them? |
| 13:48.54 | rburton1 | <shrug> your cmakelists |
| 13:49.34 | davis | so I said to myself, let me build the image using the -c populate_sdk switch. I'll install the tools that way and use them to debug the build. |
| 13:49.41 | rburton1 | eww |
| 13:49.44 | davis | when i did that, bitbake failed. |
| 13:49.50 | rburton1 | the native form will just put them in the sysroot as you said |
| 13:50.00 | rburton1 | if they're there then its up to you and your cmake patching to do the right thing |
| 13:50.00 | davis | so I tried to build the base image again and it failed. |
| 13:50.41 | rburton1 | when in doubt, rm tmp and try again |
| 13:50.55 | davis | so i read some mailing list archives and talked to some folks and saw maybe I'm doing this wrong. |
| 13:51.27 | davis | instead of having two recipes, pcmx and pcmx-native, I should have one receipe which builds as a nativesdk |
| 13:51.52 | davis | i did that and it got to the point where it tried to run the exes and it failed. |
| 13:51.56 | rburton1 | why are you bringing nativesdk into this? |
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| 13:52.12 | davis | rburton1: i'm a dumbass? Idk. |
| 13:52.43 | rburton1 | step 1 is hack the cmakelists so that you can install the tools and do that in class-native to put them in the sysroot |
| 13:53.03 | davis | i thought if it was a nativesdk, it would include the tools as part of the build. |
| 13:53.12 | rburton1 | step 2 is to hack the cmakelists so that it skips building the tools in cross compile mode |
| 13:53.32 | rburton1 | nativesdk is for packages which are in a SDK. unless you're building a sdk they are not relevant. |
| 13:54.25 | davis | so, i kind of do need it in the nativesdk |
| 13:54.39 | rburton1 | i'd worry about target and native before sdk |
| 13:54.45 | davis | because not everyone here is going to want to use bitbake |
| 13:55.19 | davis | i need to be able each morning to give them the sdk tar file and say, here install this and now you can build your code for testing on the target machines. |
| 13:55.42 | rburton1 | in this case i suspect native and nativesdk will be identical as it will just build those tools |
| 13:55.48 | davis | rburton1: yes, you are smart I need to worry about native and target |
| 13:55.52 | davis | first |
| 13:56.29 | davis | so i appreciate your helpfull directions |
| 13:56.56 | rburton1 | if you have colleagues who love cmake so much point them at that wiki page and explain the problem :) |
| 13:56.56 | davis | so to get to final objective, how many recipes should I have? three? |
| 13:57.00 | rburton1 | one recipe file |
| 13:57.06 | rburton1 | bbclassextend=native |
| 13:57.14 | rburton1 | and then some native-specific bits in it |
| 13:57.45 | rburton1 | like https://github.com/rossburton/meta-beignet/blob/ross/recipes-opencl/beignet/beignet_1.1.2.bb |
| 13:57.51 | davis | so I should get back to where I can build the code 100% for the host and ahve it populate the sysroot for the host tools |
| 13:58.22 | davis | I can revert back to that. will that break the final image build and sdk build? |
| 13:58.52 | rburton1 | i endorse git to manage your changes |
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| 14:15.33 | davis | rburton1: ok, besides erasing and starting over. is there a way to get rid of this nativesdk-pcmx dependency? |
| 14:16.35 | rburton1 | i can't really answer that without having all your stuff |
| 14:16.58 | davis | yah, i'm going to just rm -rf and start fresh |
| 14:17.15 | rburton1 | delete tmp and it will all be pulled from sstate anyway |
| 14:17.19 | davis | ive been doing this so much it takes so long to retry |
| 14:18.07 | davis | so if I understand correctly, I dont need my image receipe to require this layer right? |
| 14:19.16 | davis | I guess what I'm saying is , step one, get it working for host build. |
| 14:19.26 | davis | step 2, get target build to work. |
| 14:19.38 | davis | step 3, get it in native sdk to work |
| 14:20.09 | davis | for step 1, it does not need to be in my final image, just build it as a stand alone target. $bitbake pcmx |
| 14:21.00 | rburton1 | yeah just focus on the recipe |
| 14:21.06 | davis | roger that |
| 14:22.40 | vmeson | rburton1: so is meson + a few dev-years of work to port core packages going to make building YP build 2x faster and debugging less painful? :) |
| 14:23.10 | rburton1 | vmeson: oh i doubt it! |
| 14:25.00 | vmeson | you know that we spend ~20% (?) of the time on auto* hell, right? Anyway, you might write a short summary email to oe-core or some other list. I'd read it. |
| 14:26.30 | rburton1 | yeah i know that we spend far too long in configure |
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| 18:23.24 | Crofton|work | anyone tried pyqt for qt5 yet? |
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| 19:04.42 | rburton | Crofton|work: someone who i can't recall said they use it |
| 19:05.19 | Crofton|work | hmm, I do not think there is arecipe |
| 19:05.24 | Crofton|work | need to go ride then cahse |
| 19:05.57 | Crofton|work | Why do I always end up riding at the hottest part of the day? |
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