Re: [Patch] Testing loads of cygwin1.dll from MinGW and MSVC, take3

[Max Kaehn <slothman at electric-cloud dot com>]

On Thu, 2005-06-09 at 01:53, Corinna Vinschen wrote:
> On Jun  8 11:44, Max Kaehn wrote:
> > I wound up using "eval", and was thoroughly perplexed at the way
> > that the first "eval" seems to get thrown away.
> 
> -v, please.
> 
>   tcsh> sh
>   $ eval date
>   Thu Jun  9 10:52:23 WEDT 2005
>   $
> 
> Corinna

"make -v" gives "GNU Make 3.80".  "sh -v" doesn't seem to do anything--
the ash man page doesn't mention a verbose or debugging mode.  
"cygcheck -f /bin/sh" reports ash-20040127-1.  "cygcheck -f /bin/make"
reports ash-20040127-1.  "make --debug" doesn't tell anything
interesting.  I'm using cygwin1.dll from the cygwin1-20050609.dll.bz2
snapshot.  (I wasn't sure if you meant -v for version numbers
or verbose output; I hope what you wanted is somewhere in there.)

I've tried testing this with a pure shell script and I can't reproduce
the problem there.  If the cause lies with GNU make, it's pretty
subtle, since the Electric Cloud make program gets the same results.

I'm badly out of practice with the classic Bourne shell, and I
haven't worked with ash before, so I may be missing something basic.

Using this makefile:
---
TESTS = foo bar baz

all:
	@i=0; \
	eval ""; \
	for tool in $(TESTS); do \
	    echo "results_$${tool}=$$i"; \
	    eval "results_$${tool}=$$i"; \
	    i=`expr $$i + 1`; \
	done; \
	echo "results_foo = $$results_foo"; \
	echo "results_bar = $$results_bar"; \
	echo "results_baz = $$results_baz"; \
	for tool in $(TESTS); do \
	    eval "result=\$$results_$$tool"; \
	    echo "results_$$tool = $$result";\
	    if [ $${result} -ne 0 ] ; then \
		exit $$result; \
	    fi; \
	done;
---
with the 'eval ""' line present I get:


fulgurite-xpdbg% make -f /u/cygwin/src/winsup/testsuite/iterate.mak
results_foo=0
results_bar=1
results_baz=2
results_foo = 0
results_bar = 1
results_baz = 2
results_foo = 0
results_bar = 1
make: *** [all] Error 1

Delete the line with 'eval ""' and:

fulgurite-xpdbg% make -f /u/cygwin/src/winsup/testsuite/iterate.mak
results_foo=0
results_bar=1
results_baz=2
results_foo = 
results_bar = 1
results_baz = 2
results_foo = 
[: 0: unknown operand
results_bar = 1
make: *** [all] Error 1

This shell script, on the other hand, works just fine:
---
	i=0; \
	for tool in foo bar baz; do \
	    echo "results_${tool}=$i"; \
	    eval "results_${tool}=$i"; \
	    i=`expr $i + 1`; \
	done; \
	echo "results_foo = $results_foo"; \
	echo "results_bar = $results_bar"; \
	echo "results_baz = $results_baz"; \
	for tool in foo bar baz; do \
	    eval "result=\$results_$tool"; \
	    echo "results_$tool = $result"; \
	    if [ ${result} -ne 0 ] ; then \
		exit $result; \
	    fi; \
	done;
---