Re: shell trap builtin in rules

[Martin Sebor]

Paul D. Smith wrote:
> On Monday, 6 November, Martin Sebor (address@hidden) wrote:
>
>
> > I must be missing something but I don't see why the trap special
> > builtin wouldn't work the same in a make rule as in shell. Could
> > someone enlighten me? I expect the make output below to be 1 but
> > I get 0 instead.
> >
> > $ (trap 'echo $?' EXIT && exit 1)
> > 1
> > $ echo "foo:; trap 'echo \$\$?' EXIT && exit 1" > mf \
> >   && gmake -f mf foo
> > trap 'echo $?' EXIT && exit 1
> > 0
> > gmake: *** [foo] Error 1
>
>
> It works for me.  Maybe it's your shell?

Apparently. I originally ran my code on Solaris. I have tried
/usr/xpg4/bin/sh but got the same results. AIX, HP-UX, IRIX,
and Tru64 all behave the same as well. Bash is the only shell
that produces the result I expect.

Martin

> Remember that make uses /bin/sh to
> run all of its commands.  On my system /bin/sh is really bash but maybe your
> /bin/sh is something else.  Also, what version of make are you using?
>
>
>   $ echo "foo:; trap 'echo \$\$?' EXIT && exit 1" | make -f -
>   trap 'echo $?' EXIT && exit 1
>   1
>   make: *** [foo] Error 1