Date: Sun, 22 Sep 2013 18:25:44 -0500 From: Bryan Drewery <bdrewery@FreeBSD.org> To: Ian Lepore <ian@FreeBSD.org> Cc: FreeBSD Hackers <freebsd-hackers@FreeBSD.org>, freebsd-current <freebsd-current@FreeBSD.org> Subject: Re: The right way to invoke sh from a freebsd makefile? Message-ID: <523F7C78.8080603@FreeBSD.org> In-Reply-To: <1379891905.1197.115.camel@revolution.hippie.lan> References: <1379891905.1197.115.camel@revolution.hippie.lan>
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On 9/22/2013 6:18 PM, Ian Lepore wrote:
> What's the right way to launch the bourne shell from a makefile? I had=
> assumed the ${SHELL} variable would be set to "the right" copy
> of /bin/sh (like maybe the one in tmp or legacy at various stages). It=
> appears that that's not the case, and ${SHELL} is whatever comes from
> the environment, which can lead to using csh or bash or whatever.
>=20
> I see some of our makefiles use just a bare "sh" which seems reasonable=
> to me, but I don't want to glitch this in src/include/Makefile again.
> The goal is to run a script in src/include/Makefile by launching sh wit=
h
> the script name (as opposed to launching the script and letting the #!
> do its thing, which doesn't work if the source dir is mounted noexec).
>=20
> -- Ian
>=20
Grepping the Makefiles in the tree, 'sh' is the very common. I see
around 157 users of this pattern. 13 use /bin/sh directly. Also consider
that it is highly likely, if not required, that a /bin/sh will exist.
Calling 'sh' specifically is definitely more proper than ${SHELL} since
it is an sh script.
--=20
Regards,
Bryan Drewery
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