From 553b91460a28b52c3b1ef6ba759c3a67f81f447f Mon Sep 17 00:00:00 2001
From: Valeriy Koval <valeros@bigmir.net>
Date: Fri, 18 Mar 2016 18:50:05 +0200
Subject: [PATCH] Update linker flags for teensy platform

---
 platformio/boards/teensy.json        | 6 +++---
 platformio/builder/scripts/teensy.py | 4 +++-
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/platformio/boards/teensy.json b/platformio/boards/teensy.json
index dd4816ae..eba8eea1 100644
--- a/platformio/boards/teensy.json
+++ b/platformio/boards/teensy.json
@@ -36,7 +36,7 @@
     "teensy30": {
         "build": {
             "core": "teensy3",
-            "extra_flags": "-D__MK20DX128__",
+            "extra_flags": "-D__MK20DX128__ -larm_cortexM4l_math",
             "f_cpu": "48000000L",
             "ldscript": "mk20dx128.ld",
             "mcu": "mk20dx128",
@@ -56,7 +56,7 @@
     "teensy31": {
         "build": {
             "core": "teensy3",
-            "extra_flags": "-D__MK20DX256__",
+            "extra_flags": "-D__MK20DX256__ -larm_cortexM4l_math",
             "f_cpu": "72000000L",
             "ldscript": "mk20dx256.ld",
             "mcu": "mk20dx256",
@@ -76,7 +76,7 @@
     "teensylc": {
         "build": {
             "core": "teensy3",
-            "extra_flags": "-D__MKL26Z64__",
+            "extra_flags": "-D__MKL26Z64__ -larm_cortexM0l_math",
             "f_cpu": "48000000L",
             "ldscript": "mkl26z64.ld",
             "mcu": "mkl26z64",
diff --git a/platformio/builder/scripts/teensy.py b/platformio/builder/scripts/teensy.py
index 310ad8d0..7f9b52c8 100644
--- a/platformio/builder/scripts/teensy.py
+++ b/platformio/builder/scripts/teensy.py
@@ -29,7 +29,9 @@ elif env.get("BOARD_OPTIONS", {}).get("build", {}).get("core") == "teensy3":
     SConscript(env.subst(join("$PIOBUILDER_DIR", "scripts", "basearm.py")))
     env.Append(
         LINKFLAGS=[
-            "-Wl,--defsym=__rtc_localtime=$UNIX_TIME"
+            "-Wl,--defsym=__rtc_localtime=$UNIX_TIME",
+            "-fsingle-precision-constant",
+            "--specs=nano.specs"
         ],
         CCFLAGS=[
             "-fsingle-precision-constant"