[...]
dummyIOC_LIBS += $(EPICS_BASE_IOC_LIBS)
dummyIOC_LIBS += asyn
dummyIOC_LIBS += autosave
[...]
/usr/bin/aarch64-linux-gnu-g++ -o dummyIOC -Wl,-Bstatic -L/root/dummyIOC/lib/linux-aarch64 -L/usr/local/epics-nfs/base/R7.0.5/lib/linux-aarch64 -L/usr/local/epics-nfs/modules/R7.0.5/support/synApps/support/asyn-R4-42/lib/linux-aarch64
-L/usr/local/epics-nfs/modules/R7.0.5/support/synApps/support/autosave-R5-10-2/lib/linux-aarch64 -Wl,-rpath,/root/dummyIOC/lib/linux-aarch64 -Wl,-rpath,/usr/local/epics-nfs/base/R7.0.5/lib/linux-aarch64 -Wl,-rpath,/usr/local/epics-nfs/modules/R7.0.5/support/synApps/support/asyn-R4-42/lib/linux-aarch64
-Wl,-rpath,/usr/local/epics-nfs/modules/R7.0.5/support/synApps/support/autosave-R5-10-2/lib/linux-aarch64 -rdynamic -L/usr/aarch64-linux-gnu/lib dummyIOC_registerRecordDeviceDriver.o dummyIOCMain.o -ldbRecStd -ldbCore -lca -lCom -lasyn
-lautosave -Wl,-Bdynamic -lpthread -lm -lrt -ldl -lgcc
/usr/local/epics-nfs/modules/R7.0.5/support/synApps/support/autosave-R5-10-2/lib/linux-aarch64/libautosave.a(save_restore.o): In function `manual_save':
save_restore.c:(.text+0x898): undefined reference to `epicsMessageQueueSend'
[...]
This looks like a static build.
In that case, the order of libraries in the ..._LIBS setting is crucial: add specific modules first, then their dependencies.
Try reversing the order of "dummyIOC_LIBS += ..." lines in your Makefile.
Cheers,
~Ralph