Re: Cross Compilation of Epics-base

["Johnson, Andrew N. via Tech-talk" <tech-talk at aps.anl.gov>]

Hi,

 

I haven't seen any replies to your question here yet. I know many of our core developers have been at the ICALEPCS-2023 conference, and I'm on vacation this week and next, so my apologies if you're still waiting for help.

 

Unfortunately we don't have detailed documentation that answers your question (I agree that we should), but the majority of the configuration needed to set up your cross-builds may have already been done. You haven’t said what your host architecture is, I hope it's Linux on 32- or 64-bit x86 or amd64, and that your target will be running under Linux.

 

Assuming those are correct you would start by editing the file base-7.0.7/configure/os/CONFIG_SITE.linux-x86.linux-arm and change the GNU_DIR variable there to point to the prefix of where your cross-compiler has been installed — the EPICS build system looks in $(GNU_DIR)/bin for the cross-compiler.

 

Then edit the base-7.0.7/configure/CONFIG_SITE file and set CROSS_COMPILER_TARGET_ARCHS to linux-arm. You don't need to make any other changes in those files for now.

 

With those settings you can try running "make" in the base-7.0.7/configure directory. That should create the directories O.linux-x86_64 and O.linux-arm, and inside each of those it will try to run the C Preprocessor for that target. If you don't see the build in the O.linux-arm directory running your cross-compiler's preprocessor you will have to make some additional configuration changes, but you should copy the command-line it runs and any errors you get into a post to this mailing list for help at that stage.

 

If it did the right thing, cd to the base-7.0.7 directory and run "make" from there to see how far the build gets. Again if you see errors please copy & paste them into an email here (don't paste a screen-dump image, text only).

 

The more detail about your configuration and the errors you're seeing that you send to this list, the easier it will be for us to help.

 

- Andrew

 

 

From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of nsrivastava via Tech-talk <tech-talk at aps.anl.gov>
Date: Tuesday, October 10, 2023 at 2:50 AM
To: tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Subject: Cross Compilation of Epics-base

I have created a cross toolchain using Yocto (Kirkstone branch) for Nvidia Jetson Xavier NX development kit. I am trying to compile epics-base-7.0.7 version (https://epics.anl.gov/download/base/base-7.0.7.tar.gz) using the cross toolchain for arm architecture.

 

I am unable to find any clear instruction to cross compile epic 7.0.7 for any other architecture. It would be helpful to guide me through the link to document or any related information. Thank you

 

Regards

NSrivastava

 

 

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