Re: [bug #47171] please fall back to system() when command is not found on $PATH

[Zoltan]

On 02/16/2016 12:34 PM, Manoj Srivastava wrote:
> but POSIX sayeth
> 
> | An execution line is built from the command line by removing 
> | any prefix characters. Except as described under the at-sign 
> | prefix, the execution line shall be written to the standard
> | output, optionally preceded by a <tab>. The execution line |
> | shall then be executed by a shell as if it were passed as the 
> | argument to the system( ) interface, except that the shell −e 
> | option shall also be in effect.
> 
> The cause is that "make" expects to be run on a POSIX system, where
> non-special shell builtins like "command" would be available for use by execvp
> (see sh_cmds[] in job.c).  See the explanation by Jilles Tjoelker at
>  http://bugs.debian.org/cgi-bin/bugreport.cgi?msg=43;bug=436466
> for more details.
> 

If you had stated that the bug is that the ".POSIX" target doesn't conform to
this (from make info):

`.POSIX'
     If `.POSIX' is mentioned as a target, then the makefile will be
     parsed and run in POSIX-conforming mode.  This does _not_ mean
     that only POSIX-conforming makefiles will be accepted: all advanced
     GNU `make' features are still available.  Rather, this target
     causes `make' to behave as required by POSIX in those areas where
     `make''s default behavior differs.

     In particular, if this target is mentioned then recipes will be
     invoked as if the shell had been passed the `-e' flag: the first
     failing command in a recipe will cause the recipe to fail
     immediately.

Then I think you'd be right.  In fact, in adding ".POSIX:" to your makefile
_still_ results in the same error, so I would classify the bug as belonging
to the .POSIX target failure to act "as if the shell had been passed the `-e'
flag".

Note that trying your makefile with "SHELL := /bin/sh -e" does result in the
expected behavior, though its only a w/a.


-- 
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