boards: remove exports of jlink related variables

boards/common/arduino-mkr/Makefile.include

@@ -7,7 +7,7 @@ include $(RIOTMAKE)/tools/serial.inc.mk
 # setup the flash tool used
 ifeq ($(PROGRAMMER),jlink)
   # in case J-Link is attached to SWD pins, use a plain CPU memory model
-  export JLINK_DEVICE := $(MKR_JLINK_DEVICE)
+  JLINK_DEVICE = $(MKR_JLINK_DEVICE)
   include $(RIOTMAKE)/tools/jlink.inc.mk
 else
   # by default, we use BOSSA to flash this board and take into account the

boards/common/nrf51/Makefile.include

@@ -15,6 +15,6 @@ ifeq ($(PROGRAMMER),openocd)
   include $(RIOTMAKE)/tools/openocd.inc.mk
 else ifeq ($(PROGRAMMER),jlink)
   # setup JLink for flashing
-  export JLINK_DEVICE := nrf51822
+  JLINK_DEVICE = nrf51822
   include $(RIOTMAKE)/tools/jlink.inc.mk
 endif

boards/common/nrf52/Makefile.include

@@ -14,12 +14,12 @@ include $(RIOTBOARD)/$(BOARD)/Makefile.dep
 PROGRAMMER ?= jlink
 ifeq (jlink,$(PROGRAMMER))
   # setup JLink for flashing
-  export JLINK_DEVICE := nrf52
+  JLINK_DEVICE = nrf52
 
   # special options when using SoftDevice
   ifneq (,$(filter nordic_softdevice_ble,$(USEPKG)))
-    export JLINK_PRE_FLASH := loadfile $(BINDIR)/softdevice.hex
-    export FLASH_ADDR := 0x1f000
+    JLINK_PRE_FLASH = loadfile $(BINDIR)/softdevice.hex
+    FLASH_ADDR = 0x1f000
     LINKER_SCRIPT ?= $(RIOTCPU)/$(CPU)/ldscripts/$(CPU_MODEL)_sd.ld
     # murdock: softdevice.hex file is used for flashing
     # It must be taken into account for the test input hash and

boards/common/silabs/Makefile.include

@@ -3,7 +3,7 @@ INCLUDES += -I$(RIOTBOARD)/common/silabs/drivers/include
 
 PROGRAMMER ?= jlink
 
-export JLINK_DEVICE ?= ${CPU_MODEL}
+JLINK_DEVICE ?= ${CPU_MODEL}
 OPENOCD_CONFIG ?= board/efm32.cfg
 
 ifeq ($(PROGRAMMER),jlink)

boards/common/slwstk6000b/Makefile.include

@@ -11,7 +11,7 @@ include $(RIOTMAKE)/tools/serial.inc.mk
 
 # setup JLink for flashing
 include $(RIOTBOARD)/common/slwstk6000b/slwstk6000b.info.mk
-export JLINK_DEVICE = $(word 2, $(SLWSTK6000B_MAINBOARD_VARS_$(BOARD_MODULE)))
+JLINK_DEVICE = $(word 2, $(SLWSTK6000B_MAINBOARD_VARS_$(BOARD_MODULE)))
 
 # include board common
 include $(RIOTBOARD)/common/silabs/Makefile.include

boards/feather-m0/Makefile.include

@@ -7,7 +7,7 @@ include $(RIOTMAKE)/tools/serial.inc.mk
 # setup the flash tool used
 ifeq ($(PROGRAMMER),jlink)
   # in case J-Link is attached to SWD pins, use a plain CPU memory model
-  export JLINK_DEVICE := atsamd21
+  JLINK_DEVICE = atsamd21
   include $(RIOTMAKE)/tools/jlink.inc.mk
 else
   # by default, we use BOSSA to flash this board to take into account the

boards/hamilton/Makefile.include

@@ -1,5 +1,5 @@
 # debugger config
-export JLINK_DEVICE := atsamr21e18a
+JLINK_DEVICE = atsamr21e18a
 OBJDUMPFLAGS += --disassemble --source --disassembler-options=force-thumb
 OFLAGS := --gap-fill 0xff
 

boards/hifive1b/Makefile.include

@@ -7,9 +7,9 @@ include $(RIOTMAKE)/tools/serial.inc.mk
 
 # setup JLink for flashing
 # export JLINK := JLink
-export JLINK_DEVICE := FE310
-export JLINK_IF := JTAG
-export FLASH_ADDR := 0x20010000
+JLINK_DEVICE = FE310
+JLINK_IF = JTAG
+FLASH_ADDR = 0x20010000
 include $(RIOTMAKE)/tools/jlink.inc.mk
 
 TESTRUNNER_RESET_DELAY = 1

boards/ikea-tradfri/Makefile.include

@@ -3,7 +3,7 @@ PORT_LINUX ?= /dev/ttyACM0
 PORT_DARWIN ?= $(firstword $(sort $(wildcard /dev/tty.usbmodem*)))
 
 # setup JLink for flashing
-export JLINK_DEVICE := EFR32MG1PxxxF256
+JLINK_DEVICE = EFR32MG1PxxxF256
 include $(RIOTMAKE)/tools/jlink.inc.mk
 
 # setup serial terminal

boards/openmote-b/Makefile.include

@@ -21,10 +21,10 @@ ifeq ($(PROGRAMMER),cc2538-bsl)
   include $(RIOTMAKE)/tools/cc2538-bsl.inc.mk
 else ifeq ($(PROGRAMMER),jlink)
   # Special flashing and reset scripts are required due to board hardware
-  export FLASH_ADDR = 0x200000
-  export JLINK_DEVICE = CC2538SF53
-  export JLINK_IF = JTAG
-  export JLINK_RESET_FILE = $(RIOTBOARD)/openmote-b/dist/hw_reset.seg
+  FLASH_ADDR = 0x200000
+  JLINK_DEVICE = CC2538SF53
+  JLINK_IF = JTAG
+  JLINK_RESET_FILE = $(RIOTBOARD)/openmote-b/dist/hw_reset.seg
   include $(RIOTMAKE)/tools/jlink.inc.mk
 endif
 

boards/openmote-cc2538/Makefile.include

@@ -9,9 +9,9 @@ PROGRAMMER ?= cc2538-bsl
 
 ifeq ($(PROGRAMMER),jlink)
   # setup JLink for flashing
-  export JLINK_DEVICE := cc2538sf53
-  export FLASH_ADDR := 0x200000
-  export JLINK_IF := JTAG
+  JLINK_DEVICE = cc2538sf53
+  FLASH_ADDR = 0x200000
+  JLINK_IF = JTAG
   export TUI := 1
   include $(RIOTMAKE)/tools/jlink.inc.mk
 else ifeq ($(PROGRAMMER),cc2538-bsl)

boards/pic32-wifire/Makefile.include

@@ -20,7 +20,7 @@ ifeq ($(PROGRAMMER),pic32prog)
   include $(RIOTMAKE)/tools/pic32prog.inc.mk
 else ifeq ($(PROGRAMMER),jlink)
   FLASHFILE ?= $(HEXFILE)
-  export JLINK_DEVICE := PIC32MZ2048EFG100
-  export JLINK_IF := JTAG
+  JLINK_DEVICE = PIC32MZ2048EFG100
+  JLINK_IF = JTAG
   include $(RIOTMAKE)/tools/jlink.inc.mk
 endif

boards/sensebox_samd21/Makefile.include

@@ -7,7 +7,7 @@ include $(RIOTMAKE)/tools/serial.inc.mk
 # setup the flash tool used
 ifeq ($(PROGRAMMER),jlink)
   # in case J-Link is attached to SWD pins, use a plain CPU memory model
-  export JLINK_DEVICE := atsamd21
+  JLINK_DEVICE = atsamd21
   include $(RIOTMAKE)/tools/jlink.inc.mk
 else
   # by default, we use BOSSA to flash this board to take into account the

boards/slstk3401a/Makefile.include

@@ -6,7 +6,7 @@ PORT_DARWIN ?= $(firstword $(sort $(wildcard /dev/tty.usbmodem*)))
 include $(RIOTMAKE)/tools/serial.inc.mk
 
 # setup JLink for flashing
-export JLINK_PRE_FLASH = r
+JLINK_PRE_FLASH = r
 
 # include board common
 include $(RIOTBOARD)/common/silabs/Makefile.include

boards/slstk3402a/Makefile.include

@@ -6,7 +6,7 @@ PORT_DARWIN ?= $(firstword $(sort $(wildcard /dev/tty.usbmodem*)))
 include $(RIOTMAKE)/tools/serial.inc.mk
 
 # setup JLink for flashing
-export JLINK_PRE_FLASH = r
+JLINK_PRE_FLASH = r
 
 # include board common
 include $(RIOTBOARD)/common/silabs/Makefile.include

boards/sltb001a/Makefile.include

@@ -6,8 +6,8 @@ PORT_DARWIN ?= $(firstword $(sort $(wildcard /dev/tty.usbmodem*)))
 include $(RIOTMAKE)/tools/serial.inc.mk
 
 # setup JLink for flashing
-export JLINK_DEVICE := EFR32MG1PxxxF256
-export JLINK_PRE_FLASH = r
+JLINK_DEVICE = EFR32MG1PxxxF256
+JLINK_PRE_FLASH = r
 
 # include board common
 include $(RIOTBOARD)/common/silabs/Makefile.include

boards/slwstk6220a/Makefile.include

@@ -3,7 +3,7 @@ PORT_LINUX ?= /dev/ttyACM0
 PORT_DARWIN ?= $(firstword $(sort $(wildcard /dev/tty.usbmodem*)))
 
 # setup JLink for flashing
-export JLINK_DEVICE := ezr32wg330f256
+JLINK_DEVICE = ezr32wg330f256
 include $(RIOTMAKE)/tools/jlink.inc.mk
 
 # setup serial terminal

dist/tools/buildsystem_sanity_check/check.sh

@@ -86,6 +86,8 @@ UNEXPORTED_VARIABLES+=('OPENOCD_CONFIG')
 UNEXPORTED_VARIABLES+=('OPENOCD_RESET_USE_CONNECT_ASSERT_SRST')
 UNEXPORTED_VARIABLES+=('FLASH_TARGET_TYPE')
 UNEXPORTED_VARIABLES+=('PYOCD_ADAPTER_INIT')
+UNEXPORTED_VARIABLES+=('JLINK_DEVICE' 'JLINK_IF')
+UNEXPORTED_VARIABLES+=('JLINK_PRE_FLASH' 'JLINK_RESET_FILE')
 
 EXPORTED_VARIABLES_ONLY_IN_VARS=()
 EXPORTED_VARIABLES_ONLY_IN_VARS+=('APPDEPS')

makefiles/tools/jlink.inc.mk

@@ -12,6 +12,28 @@ RESET_FLAGS ?= reset
 
 JLINK_SERIAL ?= $(DEBUG_ADAPTER_ID)
 
+JLINK_IF ?=
+JLINK_RESET_FILE ?=
+JLINK_PRE_FLASH ?=
+
 # Export JLINK_SERIAL to required targets
 JLINK_TARGETS = debug% flash% reset term-rtt
 $(call target-export-variables,$(JLINK_TARGETS),JLINK_SERIAL)
+
+# Export JLINK_DEVICE to required targets
+$(call target-export-variables,$(JLINK_TARGETS),JLINK_DEVICE)
+
+ifneq (,$(JLINK_IF))
+  # Export JLINK_IF to required targets if not empty
+  $(call target-export-variables,$(JLINK_TARGETS),JLINK_IF)
+endif
+
+ifneq (,$(JLINK_RESET_FILE))
+  # Export JLINK_RESET_FILE to required targets if not empty
+  $(call target-export-variables,$(JLINK_TARGETS),JLINK_RESET_FILE)
+endif
+
+# Export JLINK_PRE_FLASH to flash targets only if not empty
+ifneq (,$(JLINK_PRE_FLASH))
+  $(call target-export-variables,flash%,JLINK_PRE_FLASH)
+endif