From fb484c5e54f2e31cf0a338d2927a06a2870bcc2c Mon Sep 17 00:00:00 2001 From: Denys Dmytriyenko Date: Thu, 11 Oct 2018 16:51:58 -0400 Subject: [PATCH] Use -ffreestanding The fix is provided by Khem Raj When compiled using hosted toolchains e.g. default Linux targetted toolchains from OpenEmbedded, we need to ensure that none of hosted nature of toolchain is manifested and its compiled as a standalone baremetal application. In addition to using -nostdlib we also need to specify -ffreestanding so it does not include linux specific compiler headers etc. This means that the floating point config defaults of toolchain is not looking for platform specific headers e.g. gnu/stubs-soft.h or gnu/stubs-hard.h, since OE make it free choice to use hard-fp calling convention ABI choice, this change ensures it does not affect compiling this baremetal application Signed-off-by: Khem Raj Signed-off-by: Denys Dmytriyenko --- Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/Makefile b/Makefile index f1c10ae..3fd9f23 100644 --- a/Makefile +++ b/Makefile @@ -13,7 +13,7 @@ SRCDIR = src BINDIR = bin INCLUDES = $(SRCDIR)/include -CFLAGS =-mcpu=cortex-m3 -mthumb -nostdlib -Wall -Wundef \ +CFLAGS =-mcpu=cortex-m3 -mthumb -nostdlib -ffreestanding -Wall -Wundef \ -Werror-implicit-function-declaration -Wstrict-prototypes \ -Wdeclaration-after-statement -fno-delete-null-pointer-checks \ -Wempty-body -fno-strict-overflow -g -I$(INCLUDES) -O2 -MD -- 1.7.12.4