Canned Command Sequences and set -e

[Nicolas Fleury]

With make 3.79.1, on both IRIX and Linux x86, canned command sequences 
are not verbose; even commands not preceded by @ are not shown.

For example:

define run-yacc
yacc $(firstword $^)
mv y.tab.c $@
endef

%.c: %.y
   $(run-yacc)

is not the same thing (for output) as

$.c: %.y
   yacc $(firstword $^)
   mv y.tab.c $@



Also, in make documentation (Generate Prerequisites Automatically 
section) there's a use of "set -e" so that "command1 | command2" would 
return the exit code of command1, but it seems that set -e doesn't do 
that exactly.  "set -e" is used when "command1; command2" should stop if 
command1 returns a non-zero exit code.  This seems to be an error in 
documentation, not make.  (I'm still wondering how to get exit code of 
first command in a pipeline; right now I use a temp file)

For Example:

%.c: %.y
   set -e; exit 1 | exit 0

the latest rule would always succeed.


Thank you

Nicolas Fleury