[PATCH] firmware: Detect whether the toolchain supports pie and automatically disable the FW_PIC option

[Xiang W]

在 2021-07-10星期六的 19:24 +0100，Jessica Clarke写道：
> On 10 Jul 2021, at 19:21, Xiang W <wxjstz at 126.com> wrote:
> > 
> > Signed-off-by: Xiang W <wxjstz at 126.com>
> > ---
> > firmware/objects.mk | 4 ++++
> > 1 file changed, 4 insertions(+)
> > 
> > diff --git a/firmware/objects.mk b/firmware/objects.mk
> > index ce91c2f..96a8d7d 100644
> > --- a/firmware/objects.mk
> > +++ b/firmware/objects.mk
> > @@ -17,6 +17,10 @@ ifndef FW_PIC
> > FW_PIC := y
> > endif
> > 
> > +ifeq ($(FW_PIC),y)
> > +FW_PIC := $(shell $(CC) -nostdlib -fPIE -Wl,-pie /dev/null  -o
> > /dev/null 2>/dev/null && echo y || echo n)
> > +endif
> 
> /dev/null is not a valid object. This always gives n.
> 
> Jess
I have tested it, so that the following commands no longer report
errors

CROSS_COMPILE=riscv64-unknown-elf- make PLATFORM=generic

The error that disappeared is as follows:

/usr/lib/riscv64-unknown-elf/bin/ld: -pie not supported
collect2: error: ld returned 1 exit status
make: ***
[Makefile:351：/home/merle/workspaces/opensbi/build/platform/generic/fir
mware/payloads/test.elf] 错误 1