From 225b50c423bcb60e6b4c39f938832585347dbc3c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ga=C3=ABtan=20Harter?= <gaetan.harter@fu-berlin.de>
Date: Mon, 22 Jul 2019 16:52:18 +0200
Subject: [PATCH 1/2] sys/Makefile.include: check for newlib_nano instead of
 USE_NANO_SPECS

Check for the usage of `newlib_nano` module instead of the
`USE_NANO_SPECS` variable.

This allows also benefiting from the `printf_float` and `scanf_float`
behaviour on `arm7` and `riscv` cpus.
---
 sys/Makefile.include | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sys/Makefile.include b/sys/Makefile.include
index a9ab8095ef..bdc8147ff8 100644
--- a/sys/Makefile.include
+++ b/sys/Makefile.include
@@ -72,13 +72,13 @@ ifneq (,$(filter arduino,$(USEMODULE)))
 endif
 
 ifneq (,$(filter printf_float,$(USEMODULE)))
-  ifeq (1,$(USE_NANO_SPECS))
+  ifneq (,$(filter newlib_nano,$(USEMODULE)))
     export LINKFLAGS += -u _printf_float
   endif
 endif
 
 ifneq (,$(filter scanf_float,$(USEMODULE)))
-  ifeq (1,$(USE_NANO_SPECS))
+  ifneq (,$(filter newlib_nano,$(USEMODULE)))
     export LINKFLAGS += -u _scanf_float
   endif
 endif

From 2d5ed4f8498870b799a0cf5d2827f0eed6d68520 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ga=C3=ABtan=20Harter?= <gaetan.harter@fu-berlin.de>
Date: Mon, 22 Jul 2019 16:54:06 +0200
Subject: [PATCH 2/2] cortexm.inc.mk: remove deprecated USE_NANO_SPECS

It was replaced by using directly the `newlib_nano` module.
---
 makefiles/arch/cortexm.inc.mk | 2 --
 1 file changed, 2 deletions(-)

diff --git a/makefiles/arch/cortexm.inc.mk b/makefiles/arch/cortexm.inc.mk
index dc1794822a..da254390f4 100644
--- a/makefiles/arch/cortexm.inc.mk
+++ b/makefiles/arch/cortexm.inc.mk
@@ -144,8 +144,6 @@ include $(RIOTCPU)/cortexm_common/Makefile.include
 
 # use the nano-specs of Newlib when available
 USEMODULE += newlib_nano
-export USE_NANO_SPECS = 1
-
 # Avoid overriding the default rule:
 all: