By hardcoding
os=Msys
gcc=arm-none-eabi-gcc
exefile=arm-none-eabi-gcc
inside incdir.sh
time tools/incdir.sh -s
arm-none-eabi-gcc/home/Schock/nuttx/nuttx/include
reduced from 180ms to 40ms.
Overall, this reduced build time from 30min to an acceptable 6min.
So incdir.sh is taking too much time in MSYS2
Isn't there a possibility to cache the results of the system checks
inside incdir.sh?
The cost of getting 'os' is fork + new shell + uname
The cost of gcc is fork + new shell + grep
The cost of exfile if for + new shell + basename
Yes, so that does have to fork a lot of additional shell instances.
Perhaps you could use environment variables to cache results. I
think that Bash can access environment variables without forking.
For example, I think that you replace the line:
os=`uname -o 2>/dev/null || echo "Other"`
with
|if[-z ${os+x}];then|
export os=`uname -o 2>/dev/null || echo "Other"`
fi
See discussion of syntax at
https://stackoverflow.com/questions/3601515/how-to-check-if-a-variable-is-set-in-bash
We could probably greatly improve build performance if this were done
throughout the OS. An alternative might be to set a large set of
environment variables as part of the 'make context' phase.
In either case, we would also have to unset the environment variables on
distclean as well.
