Explicitly link example binaries statically.

This allow good share of binaries be linkable (and actually run) with a
typical distro-packaged ARM toolchain (Cortex-A and Linux targetted).

examples/stm32/f1/Makefile.include

@@ -37,7 +37,7 @@ ARCH_FLAGS      = -mthumb -mcpu=cortex-m3 -msoft-float
 CFLAGS		+= -Os -g -Wall -Wextra -I$(TOOLCHAIN_DIR)/include \
 		   -fno-common $(ARCH_FLAGS) -MD -DSTM32F1
 LDSCRIPT	?= $(BINARY).ld
-LDFLAGS		+= -Wl,--start-group -lc -lgcc -lnosys -Wl,--end-group \
+LDFLAGS		+= --static -Wl,--start-group -lc -lgcc -lnosys -Wl,--end-group \
 		   -L$(TOOLCHAIN_DIR)/lib \
 		   -T$(LDSCRIPT) -nostartfiles -Wl,--gc-sections \
 		   $(ARCH_FLAGS) -mfix-cortex-m3-ldrd

examples/stm32/f2/Makefile.include

@@ -37,7 +37,7 @@ endif
 CFLAGS		+= -Os -g -Wall -Wextra -I$(TOOLCHAIN_DIR)/include \
 		   -fno-common -mcpu=cortex-m3 -mthumb -msoft-float -MD -DSTM32F2
 LDSCRIPT	?= $(BINARY).ld
-LDFLAGS		+= -Wl,--start-group -lc -lgcc -lnosys -Wl,--end-group \
+LDFLAGS		+= --static -Wl,--start-group -lc -lgcc -lnosys -Wl,--end-group \
 		   -L$(TOOLCHAIN_DIR)/lib -L$(TOOLCHAIN_DIR)/lib/stm32/f2 \
 		   -T$(LDSCRIPT) -nostartfiles -Wl,--gc-sections \
 		   -mthumb -march=armv7 -mfix-cortex-m3-ldrd -msoft-float

examples/stm32/f4/Makefile.include

@@ -38,7 +38,7 @@ endif
 CFLAGS		+= -Os -g -Wall -Wextra -I$(TOOLCHAIN_DIR)/include \
 		   -fno-common -mcpu=cortex-m4 -mthumb -msoft-float -MD -DSTM32F4
 LDSCRIPT	?= $(BINARY).ld
-LDFLAGS		+= -lc -lnosys -L$(TOOLCHAIN_DIR)/lib \
+LDFLAGS		+= --static -lc -lnosys -L$(TOOLCHAIN_DIR)/lib \
 			 -L$(TOOLCHAIN_DIR)/lib/stm32/f4 \
 		   -T$(LDSCRIPT) -nostartfiles -Wl,--gc-sections \
 		   -mthumb -mcpu=cortex-m4 -march=armv7 -mfix-cortex-m3-ldrd -msoft-float