On Mon, Aug 03, 2020 at 11:07:36AM +0800, Po-Hsu Lin 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 e0a3938..ec23ed6 100644 > --- a/Makefile > +++ b/Makefile > @@ -32,7 +32,7 @@ > # > ############################################################################## > > -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 \ > -- > 2.17.1 > Thanks, applied. - Eric
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