From b82e7eee52f72200b9f4a615c299056c4e09e071 Mon Sep 17 00:00:00 2001
From: Piotr Esden-Tempski <piotr@esden.net>
Date: Mon, 13 Aug 2012 15:23:07 -0700
Subject: [PATCH] Examples detect if they are being built in src dir.

If an example is in the libopencm3 source directory it will use the
locally built library instead of the system library.

When you copy an example out of the libopencm3 tree it will
automatically detect it and build using the system wide installation.
---
 examples/lm3s/Makefile.include     | 11 ++++++++---
 examples/lpc13xx/Makefile.include  | 11 ++++++++---
 examples/lpc17xx/Makefile.include  | 11 ++++++++---
 examples/lpc43xx/Makefile.include  | 11 ++++++++---
 examples/stm32/f1/Makefile.include | 11 ++++++++---
 examples/stm32/f2/Makefile.include | 11 ++++++++---
 examples/stm32/f4/Makefile.include | 11 ++++++++---
 7 files changed, 56 insertions(+), 21 deletions(-)

diff --git a/examples/lm3s/Makefile.include b/examples/lm3s/Makefile.include
index c1198462..4d774bea 100644
--- a/examples/lm3s/Makefile.include
+++ b/examples/lm3s/Makefile.include
@@ -24,9 +24,14 @@ CC		= $(PREFIX)-gcc
 LD		= $(PREFIX)-gcc
 OBJCOPY		= $(PREFIX)-objcopy
 OBJDUMP		= $(PREFIX)-objdump
-# Uncomment this line if you want to use the installed (not local) library.
-# TOOLCHAIN_DIR := $(shell dirname `which $(CC)`)/../$(PREFIX)
-TOOLCHAIN_DIR   = ../../../..
+ifeq ($(shell ls ../../../../../lib/libopencm3_lm3s.a 2>/dev/null),)
+TOOLCHAIN_DIR := $(shell dirname `which $(CC)`)/../$(PREFIX)
+else
+ifeq ($(V),1)
+$(info We seem to be building the example in the source directory. Using local library!)
+endif
+TOOLCHAIN_DIR := ../../../..
+endif
 CFLAGS		+= -O0 -g3 -Wall -Wextra -I$(TOOLCHAIN_DIR)/include -fno-common \
 		   -mcpu=cortex-m3 -mthumb -MD
 LDSCRIPT	?= $(BINARY).ld
diff --git a/examples/lpc13xx/Makefile.include b/examples/lpc13xx/Makefile.include
index 47d906cf..afd0524c 100644
--- a/examples/lpc13xx/Makefile.include
+++ b/examples/lpc13xx/Makefile.include
@@ -24,9 +24,14 @@ CC		= $(PREFIX)-gcc
 LD		= $(PREFIX)-gcc
 OBJCOPY		= $(PREFIX)-objcopy
 OBJDUMP		= $(PREFIX)-objdump
-# Uncomment this line if you want to use the installed (not local) library.
-# TOOLCHAIN_DIR := $(shell dirname `which $(CC)`)/../$(PREFIX)
-TOOLCHAIN_DIR   = ../../../..
+ifeq ($(shell ls ../../../../../lib/libopencm3_lpc13xx.a 2>/dev/null),)
+TOOLCHAIN_DIR := $(shell dirname `which $(CC)`)/../$(PREFIX)
+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-m3 -mthumb -MD
 LDSCRIPT	?= $(BINARY).ld
diff --git a/examples/lpc17xx/Makefile.include b/examples/lpc17xx/Makefile.include
index 92df4b12..f620a72f 100644
--- a/examples/lpc17xx/Makefile.include
+++ b/examples/lpc17xx/Makefile.include
@@ -24,9 +24,14 @@ CC		= $(PREFIX)-gcc
 LD		= $(PREFIX)-gcc
 OBJCOPY		= $(PREFIX)-objcopy
 OBJDUMP		= $(PREFIX)-objdump
-# Uncomment this line if you want to use the installed (not local) library.
-# TOOLCHAIN_DIR := $(shell dirname `which $(CC)`)/../$(PREFIX)
-TOOLCHAIN_DIR   = ../../../..
+ifeq ($(shell ls ../../../../../lib/libopencm3_lpc17xx.a 2>/dev/null),)
+TOOLCHAIN_DIR := $(shell dirname `which $(CC)`)/../$(PREFIX)
+else
+ifeq ($(V),1)
+$(info We seem to be building the example in the source directory. Using local library!)
+endif
+TOOLCHAIN_DIR := ../../../..
+endif
 CFLAGS		+= -O0 -g -Wall -Wextra -I$(TOOLCHAIN_DIR)/include -fno-common \
 		   -mcpu=cortex-m3 -mthumb -MD
 LDSCRIPT	?= $(BINARY).ld
diff --git a/examples/lpc43xx/Makefile.include b/examples/lpc43xx/Makefile.include
index 074192a6..b4717cdd 100644
--- a/examples/lpc43xx/Makefile.include
+++ b/examples/lpc43xx/Makefile.include
@@ -27,9 +27,14 @@ LD		= $(PREFIX)-gcc
 OBJCOPY		= $(PREFIX)-objcopy
 OBJDUMP		= $(PREFIX)-objdump
 GDB		= $(PREFIX)-gdb
-# Uncomment this line if you want to use the installed (not local) library.
-# TOOLCHAIN_DIR := $(shell dirname `which $(CC)`)/../$(PREFIX)
-TOOLCHAIN_DIR   = ../../../..
+ifeq ($(shell ls ../../../../../lib/libopencm3_lpc43xx.a 2>/dev/null),)
+TOOLCHAIN_DIR := $(shell dirname `which $(CC)`)/../$(PREFIX)
+else
+ifeq ($(V),1)
+$(info We seem to be building the example in the source directory. Using local library!)
+endif
+TOOLCHAIN_DIR := ../../../..
+endif
 CFLAGS		+= -O2 -g -Wall -Wextra -I$(TOOLCHAIN_DIR)/include -fno-common \
 		   -mcpu=cortex-m4 -mthumb -MD \
 		   -mfloat-abi=hard -mfpu=fpv4-sp-d16
diff --git a/examples/stm32/f1/Makefile.include b/examples/stm32/f1/Makefile.include
index 31c6dccd..66865b85 100644
--- a/examples/stm32/f1/Makefile.include
+++ b/examples/stm32/f1/Makefile.include
@@ -25,9 +25,14 @@ LD		= $(PREFIX)-gcc
 OBJCOPY		= $(PREFIX)-objcopy
 OBJDUMP		= $(PREFIX)-objdump
 GDB		= $(PREFIX)-gdb
-# Uncomment this line if you want to use the installed (not local) library.
-#TOOLCHAIN_DIR := $(shell dirname `which $(CC)`)/../$(PREFIX)
-TOOLCHAIN_DIR   = ../../../../..
+ifeq ($(shell ls ../../../../../lib/libopencm3_stm32f1.a 2>/dev/null),)
+TOOLCHAIN_DIR := $(shell dirname `which $(CC)`)/../$(PREFIX)
+else
+ifeq ($(V),1)
+$(info We seem to be building the example in the source directory. Using local library!) 
+endif
+TOOLCHAIN_DIR := ../../../../..
+endif
 ARCH_FLAGS      = -mthumb -mcpu=cortex-m3 -msoft-float
 CFLAGS		+= -Os -g -Wall -Wextra -I$(TOOLCHAIN_DIR)/include \
 		   -fno-common $(ARCH_FLAGS) -MD -DSTM32F1
diff --git a/examples/stm32/f2/Makefile.include b/examples/stm32/f2/Makefile.include
index f68da433..93f6ce6d 100644
--- a/examples/stm32/f2/Makefile.include
+++ b/examples/stm32/f2/Makefile.include
@@ -26,9 +26,14 @@ LD		= $(PREFIX)-gcc
 OBJCOPY		= $(PREFIX)-objcopy
 OBJDUMP		= $(PREFIX)-objdump
 GDB		= $(PREFIX)-gdb
-# Uncomment this line if you want to use the installed (not local) library.
-#TOOLCHAIN_DIR := $(shell dirname `which $(CC)`)/../$(PREFIX)
-TOOLCHAIN_DIR   = ../../../../..
+ifeq ($(shell ls ../../../../../lib/libopencm3_stm32f2.a 2>/dev/null),)
+TOOLCHAIN_DIR := $(shell dirname `which $(CC)`)/../$(PREFIX)
+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-m3 -mthumb -msoft-float -MD -DSTM32F2
 LDSCRIPT	?= $(BINARY).ld
diff --git a/examples/stm32/f4/Makefile.include b/examples/stm32/f4/Makefile.include
index 42e7162d..2e915ce7 100644
--- a/examples/stm32/f4/Makefile.include
+++ b/examples/stm32/f4/Makefile.include
@@ -26,9 +26,14 @@ LD		= $(PREFIX)-gcc
 OBJCOPY		= $(PREFIX)-objcopy
 OBJDUMP		= $(PREFIX)-objdump
 GDB		= $(PREFIX)-gdb
-# Uncomment this line if you want to use the installed (not local) library.
-#TOOLCHAIN_DIR := $(shell dirname `which $(CC)`)/../$(PREFIX)
-TOOLCHAIN_DIR   = ../../../../..
+ifeq ($(shell ls ../../../../../lib/libopencm3_stm32f4.a 2>/dev/null),)
+TOOLCHAIN_DIR := $(shell dirname `which $(CC)`)/../$(PREFIX)
+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 -msoft-float -MD -DSTM32F4
 LDSCRIPT	?= $(BINARY).ld