examples/natmod: Use LINK_RUNTIME=1 when building for armv6m.

To get division helper functions, eg `__aeabi_uidiv`, `__aeabi_idiv` and
`__aeabi_uidivmod`.

Signed-off-by: Damien George <[email protected]>

Author: dpgeorge

examples/natmod/btree/Makefile

@@ -39,6 +39,11 @@ endif
 # Use our own errno implementation if Picolibc is used
 CFLAGS += -D__PICOLIBC_ERRNO_FUNCTION=__errno
 
+ifeq ($(ARCH),armv6m)
+# Link with libgcc.a for division helper functions
+LINK_RUNTIME = 1
+endif
+
 include $(MPY_DIR)/py/dynruntime.mk
 
 # btree needs gnu99 defined

examples/natmod/deflate/Makefile

@@ -10,6 +10,11 @@ SRC = deflate.c
 # Architecture to build for (x86, x64, armv7m, xtensa, xtensawin, rv32imc)
 ARCH ?= x64
 
+ifeq ($(ARCH),armv6m)
+# Link with libgcc.a for division helper functions
+LINK_RUNTIME = 1
+endif
+
 ifeq ($(ARCH),xtensa)
 # Link with libm.a and libgcc.a from the toolchain
 LINK_RUNTIME = 1

examples/natmod/framebuf/Makefile

@@ -10,6 +10,11 @@ SRC = framebuf.c
 # Architecture to build for (x86, x64, armv7m, xtensa, xtensawin)
 ARCH ?= x64
 
+ifeq ($(ARCH),armv6m)
+# Link with libgcc.a for division helper functions
+LINK_RUNTIME = 1
+endif
+
 ifeq ($(ARCH),xtensa)
 MPY_EXTERN_SYM_FILE=$(MPY_DIR)/ports/esp8266/boards/eagle.rom.addr.v6.ld
 endif

examples/natmod/re/Makefile

@@ -10,4 +10,9 @@ SRC = re.c
 # Architecture to build for (x86, x64, armv7m, xtensa, xtensawin, rv32imc)
 ARCH = x64
 
+ifeq ($(ARCH),armv6m)
+# Link with libgcc.a for division helper functions
+LINK_RUNTIME = 1
+endif
+
 include $(MPY_DIR)/py/dynruntime.mk