On Fri, Mar 30, 2012 at 05:11:09PM +0000, Max Brazhnikov wrote:
> On Fri, 30 Mar 2012 18:54:56 +0300, Alex Kozlov wrote:
> > On Fri, Mar 30, 2012 at 03:40:39PM +0000, Max Brazhnikov wrote:
> > > And by the way ${ECHO_CMD} should be used, if you really need echo.
> > Do You mean ECHO_MSG?
> It depends. The bsd.command.mk says:
>
> # ECHO is defined in /usr/share/mk/sys.mk, which can either be "echo",
> # or "true" if the make flag -s is given. Use ECHO_CMD where you mean
> # the echo command.
> ECHO_CMD?= echo # Shell builtin
>
> # Used to print all the '===>' style prompts - override this to turn them off.
> ECHO_MSG?= ${ECHO_CMD}
But the Porters handbook says:
Likewise, the distinction between ECHO_MSG and ECHO_CMD should be kept in mind.
The former is for printing informational text to the screen, while the latter
is for command pipelining.
A good example for both can be found in shells/bash2/Makefile:
update-etc-shells:
@${ECHO_MSG} "updating /etc/shells"
@${CP} /etc/shells /etc/shells.bak
@( ${GREP} -v ${PREFIX}/bin/bash /etc/shells.bak; \
${ECHO_CMD} ${PREFIX}/bin/bash) >/etc/shells
@${RM} /etc/shells.bak
--
Adios
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