Experimental Physics and
Industrial Control System

Benjamin Franksen <[email protected]> · Wed, 12 Mar 2014 16:35:12 +0100

Hi

I tried to fix the INC_<osclass> problem "by hand" like this:

ifeq ($(OS_CLASS),vxWorks)
inc: $(INSTALL_INCLUDE)/os/$(OS_CLASS)/bla.h
endif

instead of defining INC_vxWorks. This seems to work.

Now, in my real application the build was still broken, but only when
using parallel make i.e. make -j. I reproduced this in my cut-down
example with the following Makefile:

"""
TOP = ..
include $(TOP)/configure/CONFIG
#-----------------------------------------------
#  ADD MACRO DEFINITIONS AFTER THIS LINE

inc: $(INSTALL_INCLUDE)/os/$(OS_CLASS)/bla.h

LIBRARY_IOC += bla

bla_SRCS += bla.c

include $(TOP)/configure/RULES
#-----------------------------------------------
#  ADD RULES AFTER THIS LINE

bla.h:
	sleep 1
	echo "struct x {int y; };" > bla.h
"""

(The bla.c is trivial and includes bla.h).

This fails with

franksen@tiber: ~/tmp/inc-bug > make -sj distclean && make -sj
../bla.c:1:17: fatal error: bla.h: No such file or directory
compilation terminated.
make[2]: *** [bla.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [install.linux-x86] Error 2
make: *** [bugApp.install] Error 2

However, it works if I add an explicit dependency in the Makefile:

bla.o: bla.h

Inspecting the generated dependency makefile snippets shows why the
parallel build fails: they are empty:

franksen@tiber: ~/tmp/inc-bug > find -name *.d
./bugApp/O.RTEMS-mvme2100/bla.d
./bugApp/O.RTEMS-mvme5500/bla.d
franksen@tiber: ~/tmp/inc-bug > cat ./bugApp/O.RTEMS-mvme2100/bla.d
franksen@tiber: ~/tmp/inc-bug > cat ./bugApp/O.RTEMS-mvme5500/bla.d

Cheers
Ben
--
"Make it so they have to reboot after every typo." ― Scott Adams

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System