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-rw-r--r--examples/stm32/f4/Makefile.include6
1 files changed, 5 insertions, 1 deletions
diff --git a/examples/stm32/f4/Makefile.include b/examples/stm32/f4/Makefile.include
index f436bc8..815f375 100644
--- a/examples/stm32/f4/Makefile.include
+++ b/examples/stm32/f4/Makefile.include
@@ -27,14 +27,18 @@ OBJCOPY = $(PREFIX)-objcopy
OBJDUMP = $(PREFIX)-objdump
GDB = $(PREFIX)-gdb
FLASH = $(shell which st-flash)
+
+TOOLCHAIN_DIR ?= ../../../../..
ifeq ($(wildcard ../../../../../lib/libopencm3_stm32f4.a),)
+ifneq ($(strip $(shell which $(CC))),)
TOOLCHAIN_DIR := $(shell dirname `which $(CC)`)/../$(PREFIX)
+endif
else
ifeq ($(V),1)
$(info We seem to be building the example in the source directory. Using local library!)
endif
-TOOLCHAIN_DIR := ../../../../..
endif
+
CFLAGS += -Os -g -Wall -Wextra -I$(TOOLCHAIN_DIR)/include \
-fno-common -mcpu=cortex-m4 -mthumb \
-mfloat-abi=hard -mfpu=fpv4-sp-d16 -MD -DSTM32F4