From 34bbcad7bb084892aa9c9c0ad02c610de109731e Mon Sep 17 00:00:00 2001
From: Kaspar Schleiser <kaspar@schleiser.de>
Date: Tue, 12 Jul 2016 19:50:44 +0200
Subject: [PATCH] sys: newlib: check if toolchain is compiled with
 -fshort-wchar, set CFLAGS accordingly

---
 sys/newlib/Makefile.include | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sys/newlib/Makefile.include b/sys/newlib/Makefile.include
index 5afff12d3..d9c9617c2 100644
--- a/sys/newlib/Makefile.include
+++ b/sys/newlib/Makefile.include
@@ -4,6 +4,9 @@ ifneq (,$(filter newlib_nano,$(USEMODULE)))
   # Test if nano.specs is available
   ifeq ($(shell $(LINK) -specs=nano.specs -E - 2>/dev/null >/dev/null </dev/null ; echo $$?),0)
     USE_NEWLIB_NANO = 1
+    ifeq ($(shell echo "int main(){} void _exit(int n) {(void)n;while(1);}" | LC_ALL=C $(CC) -xc - -o /dev/null -lc -specs=nano.specs -Wall -Wextra -pedantic 2>&1 | grep -q "use of wchar_t values across objects may fail" ; echo $$?),0)
+        CFLAGS += -fshort-wchar
+    endif
   endif
 endif