From 9955b7d050f23d0e61c3ea0dd9b0ba1a321e7ad3 Mon Sep 17 00:00:00 2001
From: Richard Eoin Meadows <richardeoin@gmail.com>
Date: Wed, 9 Jul 2014 21:51:46 +0100
Subject: [PATCH] Added support and example for libm

---
 Makefile         | 2 +-
 chip/sections.ld | 2 ++
 src/main.c       | 8 +++++++-
 3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 35468be..fe1ad25 100644
--- a/Makefile
+++ b/Makefile
@@ -95,7 +95,7 @@ endif
 CFLAGS		+= $(COMPILATION_FLAGS) -Wall -Wextra $(ACCEPT_WARN) -std=gnu99 \
 			-ffunction-sections -fdata-sections $(ARCH_FLAGS)
 ASFLAGS		+= -Wall $(ARCH_FLAGS) -a=/dev/null
-LDFLAGS		+= $(COMPILATION_FLAGS) -lm $(LINKER_FLAGS) -lm -Wextra $(ARCH_FLAGS)
+LDFLAGS		+= $(COMPILATION_FLAGS) $(LINKER_FLAGS) -Wextra $(ARCH_FLAGS)
 
 # Compilation Defines
 #
diff --git a/chip/sections.ld b/chip/sections.ld
index fe368db..23f7ed4 100644
--- a/chip/sections.ld
+++ b/chip/sections.ld
@@ -54,6 +54,8 @@
  */
 ENTRY(Reset_Handler)
 
+GROUP(libgcc.a libc.a libm.a)
+
 SECTIONS
 {
 	.text :
diff --git a/src/main.c b/src/main.c
index 6966f58..cbc9978 100644
--- a/src/main.c
+++ b/src/main.c
@@ -26,6 +26,7 @@
 #include "pindefs.h"
 
 #include <stdio.h>
+#include <math.h>
 #include "semihosting.h"
 
 int main(void)
@@ -41,7 +42,12 @@ int main(void)
   /* Configure the SysTick for 50ms interrupts */
   SysTick_Config(SystemCoreClock / 20);
 
-  semihost_printf("Hello World\n");
+  volatile double d, dd;
+
+  d = 2;
+  dd = sqrt(d);
+
+  semihost_printf("Hello World %f\n", dd);
 
   while (1);
 }