Re: [GNU Autoconf 2.54] failures: 28

[Akim Demaille]

|On Wed 16 Oct 2002 19:21, Akim Demaille <address@hidden> wrote:
|> rm -f config.cache
|>   sh -x ./foo.sh precious=foo
|>   sh -x ./foo.sh precious=foo -C
|>   cat config.cache
|>   cat config.log
|>   sh -x ./foo.sh precious=bar -C
|>   cat config.cache
|>   cat config.log

I think I have it!!!  I should have doubted about it much earlier :(

On the LHS it is my machine, which, of course, is sane, and on the RHS
is yours, which of course, is HP :)

+ cat confcache                         + cat confcache
                                      > + 1>& 6
# This file is a shell script that ca   # This file is a shell script that ca
# tests run on this system so they ca   # tests run on this system so they ca
# scripts and configure runs, see con   # scripts and configure runs, see con
# It is not useful on other systems.    # It is not useful on other systems. 
# want to keep, you may remove or edi   # want to keep, you may remove or edi
#                                       #
# config.status only pays attention t   # config.status only pays attention t
# the --recheck option to rerun confi   # the --recheck option to rerun confi
#                                       #
# `ac_cv_env_foo' variables (set or u   # `ac_cv_env_foo' variables (set or u
# loading this file, other *unset* `a   # loading this file, other *unset* `a
# following values.                     # following values.

ac_cv_env_build_alias_set=''          | ac_cv_env_build_alias_set=''\'''\'''
ac_cv_env_build_alias_value=''        | ac_cv_env_build_alias_value=''\'''\''
ac_cv_env_host_alias_set=''           | ac_cv_env_host_alias_set=''\'''\'''
ac_cv_env_host_alias_value=''         | ac_cv_env_host_alias_value=''\'''\'''
ac_cv_env_precious_set='set'            ac_cv_env_precious_set='set'
ac_cv_env_precious_value='foo'          ac_cv_env_precious_value='foo'
ac_cv_env_target_alias_set=''         | ac_cv_env_target_alias_set=''\'''\'''
ac_cv_env_target_alias_value=''       | ac_cv_env_target_alias_value=''\'''\'
+ echo 'foo.sh:1225: config.cache (/d | + echo foo.sh:1225: config.cache (/de
                                      > + 1>& 6
foo.sh:1225: config.cache (/dev/null)   foo.sh:1225: config.cache (/dev/null)
+ cat /dev/null                         + cat /dev/null
                                      > + 1>& 6
+ cmp -s /dev/null confcache            + cmp -s /dev/null confcache
+ test -w /dev/null                   | + :
+ test x/dev/null '!=' x/dev/null     <
+ cat confcache                       <


The piece of code is:

    cat confcache >&6
    echo "$as_me:$LINENO: config.cache ($cache_file):" >&6
    cat $cache_file >&6
    if cmp -s $cache_file confcache; then :; else
      if test -w $cache_file; then
        test "x$cache_file" != "x/dev/null" && echo "updating cache $cache_file"
        cat confcache >$cache_file
      else
        echo "not updating unwritable cache $cache_file"
      fi
    fi
    rm -f confcache


as you can see, it took the then branch, instead of the else branch.
In other words cmp -s /dev/null some-non-empty-file succeeds :(

May I ask you:

        cmp /dev/null configure; echo $?
        cmp configure /dev/null; echo $?
        cmp -s /dev/null configure; echo $?
        cmp -s  configure /dev/null; echo $?
        diff /dev/null configure >/dev/null; echo $?
        diff  configure /dev/null >/dev/null; echo $?

?

Thanks a lot!

PS/  I don't understand the elif thingy you found: what I sent was a
modified configure, which never triggered that error, did it?