On Wed, 30 Aug 2023 at 18:44, Sebastian Kuzminsky <s...@highlab.com> wrote:
> I'm confused by this command line. > > The "-o ../bin/rtapi_app" indicates that we're building rtapi_app from a > bunch of object files and libraries. Is it really rtapi_app that needs > to be linked against libgpiod, isn't it the hal_gpiod driver? Adding the -lgpiod to rtapi_app is what fixed the same problem on Buster. (Note that it all works just fine on Buster, just not bookworm. This could be a gcc / c++ version difference) It is possible that hal_gpio _also_ needs a -lgpiod though I am not sure how to arrange that. I was clued-in to the rtapi_app dependency by the error message: hal_gpio: dlopen: /home/andypugh/linuxcnc-dev/rtlib/hal_gpio.so: undefined symbol: gpiod_line_find <stdin>:1: waitpid failed /home/andypugh/linuxcnc-dev/bin/rtapi_app hal_gpio <stdin>:1: /home/andypugh/linuxcnc-dev/bin/rtapi_app exited without becoming ready <stdin>:1: insmod for hal_gpio failed, returned -1 Which mentions rtapi_app. As I said, this fixes it in Buster, but not Bookworm. > the other possibility that comes to mind is the order of > arguments on the linker command line. Some linkers (but I think not > all?) require that the "-lwhatever" libraries come *later* in the > command line than the object files that require them. When the linker > comes to to a -l argument, it tries to satisfy any *currently unknown* > symbols from the named library. That's certainly worth a try. > If none of rtapi_app's input files needed symbols from libgpiod, then > the linker will not link rtapi_app against libgpiod. See for example > how the -ltirpc in the linker command line did not cause rtapi_app to be > linked to libtirpc. Or pthread. But they all _were_ linked when compiling under Buster.... -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1912 _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
