From ce89e7e2446ec96c8ad6052c3038bf2b823104fa Mon Sep 17 00:00:00 2001
From: Cristian Maglie <c.maglie@arduino.cc>
Date: Tue, 11 Oct 2016 18:36:08 +0200
Subject: [PATCH] Launch libc initialization after hardware setup

This pachs allows C++ global constructors to run after hardware
initialization. This helps some libraries that setups hardware
in class constructor to work properly.

See also #169
---
 cores/arduino/cortex_handlers.c | 4 ----
 cores/arduino/main.cpp          | 5 +++++
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/cores/arduino/cortex_handlers.c b/cores/arduino/cortex_handlers.c
index 4192690d3..6c45c6395 100644
--- a/cores/arduino/cortex_handlers.c
+++ b/cores/arduino/cortex_handlers.c
@@ -134,7 +134,6 @@ __attribute__ ((section(".isr_vector"))) const DeviceVectors exception_table =
 };
 
 extern int main(void);
-extern void __libc_init_array(void);
 
 /* This is called on processor reset to initialize the device and call main() */
 void Reset_Handler(void)
@@ -156,9 +155,6 @@ void Reset_Handler(void)
       *pDest = 0;
   }
 
-  /* Initialize the C library */
-  __libc_init_array();
-
   SystemInit();
 
   main();
diff --git a/cores/arduino/main.cpp b/cores/arduino/main.cpp
index 8af01b573..49ebc27f5 100644
--- a/cores/arduino/main.cpp
+++ b/cores/arduino/main.cpp
@@ -24,6 +24,9 @@
 void initVariant() __attribute__((weak));
 void initVariant() { }
 
+// Initialize C library
+extern "C" void __libc_init_array(void);
+
 /*
  * \brief Main entry point of Arduino application
  */
@@ -31,6 +34,8 @@ int main( void )
 {
   init();
 
+  __libc_init_array();
+
   initVariant();
 
   delay(1);