While building automake-1.8.3 (based on autoconf 2.59a) on Solaris 9:
checking for grep that handles long lines...
checking for egrep... configure: error: no acceptable egrep could be found in $PATH
In lib/autoconf/programs.m4 we have:
AC_DEFUN([AC_PROG_GREP],
...
m4_define([_AC_PROG_GREP],
[_AC_PATH_PROG_FEATURE_CHECK([$1], [$2],
[_AC_FEATURE_CHECK_LENGTH([ac_path_$1], [ac_cv_path_$1],
["$ac_path_$1" '$1$'], [$1])])
_AC_PATH_PROG_FEATURE_CHECK is defined as:
m4_define([_AC_PATH_PROG_FEATURE_CHECK],
...
_AS_PATH_WALK([$4],
[for ac_prog in $2; do
for ac_exec_ext in '' $ac_executable_extensions; do
ac_path_$1="$as_dir/$ac_prog$ac_exec_ext"
test -f "$ac_path_$1" || continue
$3
_AC_FEATURE_CHECK_LENGTH is defined as:
m4_define([_AC_FEATURE_CHECK_LENGTH],
[if AS_EXECUTABLE_P(["$$1"]); then
# Check for GNU $1 and select it if it is found.
_AC_PATH_PROG_FLAVOR_GNU([$$1],
[$2="$$1"
break 2
])
The sh loop looks like:
for as_dir in $PATH
...
for ac_prog in grep ggrep; do
for ac_exec_ext in '' $ac_executable_extensions; do
...
if "$ac_path_GREP" --version 2>&1 < /dev/null | grep 'GNU' >/dev/null;
then
ac_cv_path_GREP="$ac_path_GREP"
break 2
fi
So, we need 'break 3', not 'break 2'. However, the 'break 2' in
_AC_FEATURE_CHECK_LENGTH seems rather brittle. Looks like we need to
get out of the loop without 'break', to avoid an assumption about how
deeply nested we are.
What should I do? Set a variable to exit the loop?
--
albert chin (china@xxxxxxxxxxxxxxxxxx)
