BTW this is for fsverity-utils. I should put a [fsverity-utils] in the title, sorry about this. I can resubmit one if you need. Thank you PHLin On Thu, Jul 30, 2020 at 5:35 PM Po-Hsu Lin <po-hsu.lin@xxxxxxxxxxxxx> wrote: > > The build on Ubuntu Xenial with GCC 5.4.0 will fail with: > cc: error: unrecognized command line option ‘-Wimplicit-fallthrough’ > > This unsupported flag is not skipped as expected. > > It is because of the /bin/sh shell on Ubuntu, DASH, which does not > support this &> redirection. Use 2>&1 to solve this problem. > > Signed-off-by: Po-Hsu Lin <po-hsu.lin@xxxxxxxxxxxxx> > --- > Makefile | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/Makefile b/Makefile > index 7d7247c..a4ce55a 100644 > --- a/Makefile > +++ b/Makefile > @@ -27,7 +27,7 @@ > # > ############################################################################## > > -cc-option = $(shell if $(CC) $(1) -c -x c /dev/null -o /dev/null &>/dev/null; \ > +cc-option = $(shell if $(CC) $(1) -c -x c /dev/null -o /dev/null > /dev/null 2>&1; \ > then echo $(1); fi) > > CFLAGS ?= -O2 -Wall -Wundef \ > -- > 2.25.1 >
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