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build: Use -ffreestanding 

this is a stand-alone/baremetal application, therefore demanding
-ffreestanding would help it compile with hosted toolchains e.g. ( linux
toolchains ), it also ensures that it won't be using platform
optimizations like inlining mem* str* functions which gcc might decide
especially with wrapper string functions in opensbi code

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Khem Raj 2020-01-06 18:41:06 -08:00 committed by Anup Patel
parent a67fd68cbf
commit 049ad0b387
1 changed files with 1 additions and 1 deletions
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Makefile
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@ -159,7 +159,7 @@ GENFLAGS += $(libsbiutils-genflags-y)
GENFLAGS += $(platform-genflags-y)
GENFLAGS += $(firmware-genflags-y)
CFLAGS = -g -Wall -Werror -nostdlib -fno-strict-aliasing -O2
CFLAGS = -g -Wall -Werror -ffreestanding -nostdlib -fno-strict-aliasing -O2
CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
CFLAGS += -mno-save-restore -mstrict-align
CFLAGS += -mabi=$(PLATFORM_RISCV_ABI) -march=$(PLATFORM_RISCV_ISA)