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

dpgeorge · dpgeorge · commit d8151ffd5a5b · 2025-07-22T14:58:07.000+10:00
To get division helper functions, eg `__aeabi_uidiv`, `__aeabi_idiv` and
`__aeabi_uidivmod`.

Signed-off-by: Damien George &lt;damien@micropython.org&gt;
diff --git a/examples/natmod/btree/Makefile b/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
diff --git a/examples/natmod/deflate/Makefile b/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
diff --git a/examples/natmod/framebuf/Makefile b/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
