RE: 'set -u' and $SHELL in makefiles [was: GNU M4]

[Chan, Lawson]

Hi Eric,

1)  actually, I use the following commands to start the execution.  So I am in 
the bash shell.
    Bash
    ./configure
    make
    Even though I am in the bash shell, running the 'env | grep SHELL' gives 
SHELL=/usr/bin/ksh
2)  $echo $- returns bhimCBH
3)  I normally don't run set -u.  I still don't know why it is set initially.
4)  I run ./configure in a fresh location and it behaves the same.
5)  The output of 'grep SHELL Makefile config.log' is attached in this email.
6)  I am using make 3.81.

Thanks,

Lawson

-----Original Message-----
From: Eric Blake [mailto:address@hidden
Sent: Wednesday, January 30, 2008 4:24 PM
To: Chan, Lawson
Cc: address@hidden; address@hidden; address@hidden
Subject: Re: 'set -u' and $SHELL in makefiles [was: GNU M4]

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According to Chan, Lawson on 1/30/2008 1:19 PM:
| Hi Eric,
|
| 1)  I am sorry that I couldn't use a free webmail account at work.
| 2)  Running the 'env | grep SHELL' gives SHELL=/usr/bin/ksh

So your default shell is ksh, but the error message seen during make was coming 
from bash, so something else is going on here.  We need to figure out how SHELL 
is getting changed when used by the Makefile.

| 3)  I use the following commands to start the execution
|     ./configure
|     make

OK - seems simple enough.

| 4)  I tried to use the command " set +u" to disable the u option
| before
running the ./configure and it gives me exactly the same result.

Do you normally run with 'set -u'?  What does 'echo $-' say?  When you reran 
./configure, was it from a fresh unpacking, or were there leftovers from your 
first attempt?

| 5)  I tried using make -k to build M4 and it gives me the same error.

What does 'grep SHELL Makefile config.log' say?
How about 'make --version'?

|
| Do you know where should I investigate on this issue?

What about in a temporary directory (and use TAB for indenting):

$ cat <<\EOF > Makefile
all:
        echo - $(SHELL) - $(MAKE) - $(MAKEFLAGS) - $$MAKEFLAGS - EOF $ make

Then repeat, but with adding the same 'SHELL = ...' line at the beginning that 
was in m4/Makefile?

- --
Don't work too hard, make some time for fun as well!

Eric Blake             address@hidden
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