JLinkExe hangs in Makefile but not in terminal on Mac OS

Question

Here are the commands I use to upload a program to the device: 
 JLinkExe -device nrf51422_xxac -if swd -speed 4000 
loadbin filename.bin 0x18000 
r 
exit
 
 It works like a charm when entered from terminal, but when added to the Makefile, it hangs after printing out last log message: 
 Loading: _build/nrf51422_xxac_s110.bin
JLinkExe -device nrf51422_xxac -if swd -speed 4000
SEGGER J-Link Commander V5.10g (Compiled Jan 6 2016 13:58:14)
DLL version V5.10g, compiled Jan 6 2016 13:57:56
Connecting to J-Link via USB...O.K.
Firmware: J-Link OB-SAM3U128-V2-NordicSemi compiled Aug 28 2015 19:26:24
Hardware version: V1.00
S/N: 681121013
Emulator has Trace capability
VTref = 3.300V
Type "connect" to establish a target connection, '?' for help
 
 So it looks like it hangs after the first JLinkExe command is executed. What is the cause of this?
BTW, I am using Xcode with External Build System target to do that. Program is compiled properly.

LukaszM · Accepted Answer

I managed to work around this by appliyin Apple script. I created upload.sh script file (had to have executable permissions, use chmod +x if needed). Then Makefile invokes this script instead of JLinkExe commands directly.
Content of upload.sh : 
 #!/bin/sh 
osascript <<END 
tell application "Terminal"
 do script "JLinkExe -device nrf51422_xxac -if swd -speed 4000
loadbin filepath.bin 0x18000
r
exit
$1"
end tell
END
 
 Replace filepath.bin with full path where bin file is expected to be after compilation (_build subdirectory) or use environmental variables to set it for you (did not have time for this yet and will update my answer when I perfect it).

JLinkExe hangs in Makefile but not in terminal on Mac OS

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