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Re: Bug#72802: make fails to correctly echo commands

From: Manoj Srivastava
Subject: Re: Bug#72802: make fails to correctly echo commands
Date: 30 Sep 2000 14:06:04 -0500
User-agent: Gnus/5.0807 (Gnus v5.8.7) Emacs/20.7


        [Please retain the CC to address@hidden so
        that the Debian Bug Tracking system can record your input]
make 3.79.1 is not correctly echoing commands when they occur in
canned command sequences. Since this is the latest version of make, I
have downgraded to the version from Debian 2.1 (make 3.77), which
never gave me any problems.

Indeed, this contradicts node Sequences: in the info documentation,
which states: 
   In command execution, each line of a canned sequence is treated just
as if the line appeared on its own in the rule, preceded by a tab.  In
particular, `make' invokes a separate subshell for each line.  You can
use the special prefix characters that affect command lines (`@', `-',
and `+') on each line of a canned sequence.  *Note Writing the Commands
in Rules: Commands.  For example, using this canned sequence:

     define frobnicate
     @echo "frobnicating target $@"
     frob-step-1 $< -o address@hidden
     frob-step-2 address@hidden -o $@

`make' will not echo the first line, the `echo' command.  But it _will_
echo the following two command lines.

   On the other hand, prefix characters on the command line that refers
to a canned sequence apply to every line in the sequence.  So the rule:

     frob.out: frob.in

does not echo _any_ commands.  (*Note Command Echoing: Echoing, for a
full explanation of `@'.)

The makefile below demonstrates the problem ("true" should occur twice in the
output, but only occurs once):


should_not_be_echoed = true This should never be seen on screen
should_be_echoed = true This is correct

define canned_sequence

all : okay faulty

okay :
        @echo "this will be okay"

faulty :
        @echo "this will fail to echo the second command in the canned sequence"

 "Consequences, Schmonsequences, as long as I'm rich." Daffy Duck,
 from Looney Tunes "Ali Baba Bunny" (1957, Chuck Jones)
Manoj Srivastava   <address@hidden>  <http://www.debian.org/%7Esrivasta/>
1024R/C7261095 print CB D9 F4 12 68 07 E4 05  CC 2D 27 12 1D F5 E8 6E
1024D/BF24424C print 4966 F272 D093 B493 410B  924B 21BA DABB BF24 424C

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