Perhaps you can try again with the post-2.68b patches applied?
There have been several fixes in that area.
I'm attaching the ones that might be relevant.
diff --git a/lib/autoconf/fortran.m4 b/lib/autoconf/fortran.m4
index afeb3ab..3803595 100644
--- a/lib/autoconf/fortran.m4
+++ b/lib/autoconf/fortran.m4
@@ -1599,7 +1599,8 @@ do
[],
[ac_cv_fc_check_bounds=$ac_flag; break])])])])
done
-rm -f conftest$ac_exeext conftest.err conftest.$ac_objext conftest.$ac_ext
+rm -f conftest$ac_exeext conftest.err conftest.$ac_objext conftest.$ac_ext \
+ core *.core core.conftest.*
FCFLAGS=$ac_fc_check_bounds_FCFLAGS_save
])
if test "x$ac_cv_fc_check_bounds" = xunknown; then
diff --git a/lib/m4sugar/m4sh.m4 b/lib/m4sugar/m4sh.m4
index be013aa..f05346b 100644
--- a/lib/m4sugar/m4sh.m4
+++ b/lib/m4sugar/m4sh.m4
@@ -1199,6 +1199,10 @@ dnl Eggert wrote the scripts with optimization help from
Paolo Bonzini).
chmod +x "$as_me.lineno"] ||
AS_ERROR([cannot create $as_me.lineno; rerun with a POSIX shell])
+ # If we had to re-execute with $CONFIG_SHELL, we're ensured to have
+ # already done that, so ensure we don't try to do so again and fall
+ # in an infinite loop. This has already happened in practice.
+ _as_can_reexec=no; export _as_can_reexec
# Don't try to exec as it changes $[0], causing all sort of problems
# (the dirname of $[0] is not the place where we might find the
# original and so on. Autoconf is especially sensitive to this).
diff --git a/tests/m4sh.at b/tests/m4sh.at
index 38667e4..4e4da5d 100644
--- a/tests/m4sh.at
+++ b/tests/m4sh.at
@@ -49,6 +49,10 @@ echo foo > sentinel
]])
AT_CHECK_M4SH
+# Calling the script simply 'script' could cause problems with
+# Solaris /usr/xpg4/bin/sh in the invocation 'sh script' below.
+mv -f script script2
+
AT_DATA([fake-shell],
[[#!/bin/sh
echo 'Fake shell executed.'
@@ -61,7 +65,7 @@ done
]])
chmod a+x fake-shell
-AT_CHECK([CONFIG_SHELL=./fake-shell ./script 1 2 4 8], [0],
+AT_CHECK([CONFIG_SHELL=./fake-shell ./script2 1 2 4 8], [0],
[Fake shell executed.
nargs = 4
:1:
@@ -73,7 +77,7 @@ AT_CHECK([test ! -f sentinel], [0])
test ! -f sentinel || rm -f sentinel # Cleanup for next test.
AT_CHECK(
-[CONFIG_SHELL=`pwd`/fake-shell sh script a 'b c' ' d e '],
+[CONFIG_SHELL=`pwd`/fake-shell sh script2 a 'b c' ' d e '],
[0],
[Fake shell executed.
nargs = 3
@@ -85,7 +89,7 @@ AT_CHECK([test ! -f sentinel], [0])
test ! -f sentinel || rm -f sentinel # Cleanup for next test.
AT_CHECK([(PATH=`pwd`:$PATH; export PATH;
-CONFIG_SHELL=fake-shell script '' '&' '!;*' '<($[]@%:@)>,' 'x
+CONFIG_SHELL=fake-shell script2 '' '&' '!;*' '<($[]@%:@)>,' 'x
y z
1 2 3')], [0],
[Fake shell executed.
@@ -120,7 +124,10 @@ exec sh "@S|@@"
chmod a+x cfg-sh
AT_CAPTURE_FILE([config.log])
-AT_CHECK([env CONFIG_SHELL=./cfg-sh ./configure], [0], [], [])
+# Export CONFIG_SITE to /dev/null to avoid spurious diffs in expected
+# stdout/stderr.
+AT_CHECK([env CONFIG_SITE=/dev/null CONFIG_SHELL=./cfg-sh ./configure],
+ [0], [], [])
# ./configure re-executed itself.
AT_CHECK([test -f cfg-sh-has-run], [0])
# And did that not to cause extra execution of later commands.
@@ -569,7 +576,7 @@ else
echo 1
fi
cat > foo.sh <<\EOF || AS_EXIT([1])
-#/bin/sh
+#!/bin/sh
exit 0
EOF
# File systems like FAT tend to fake executable permissions on all files.
@@ -579,7 +586,7 @@ st1=$?
(./foo.sh) >/dev/null 2>&1
st2=$?
case $st1:$st2 in
- 1:126 | 0:0 ) echo 2 ;;
+ *[[1-9]]*:*[[1-9]]* | 0:0 ) echo 2 ;;
*) echo "fail ($st1:$st2)" ;;
esac
# Now things better be executable
@@ -1559,9 +1566,10 @@ A_B_C_P__
dnl Check that of the last 6 macros, only 2 needed command substitution.
dnl This test abuses our knowledge of m4sh internals a bit; oh well.
-AT_CHECK([sed -n '/start here/,$ {
+AT_CHECK([tab=' ' # a single ASCII tab character
+sed -n '/start here/,$ {
/`.*`/p
-}' script | wc -l], [], [[2
+}' script | wc -l | sed "s/[[ $tab]]//g" ], [], [[2
]])
AT_CLEANUP
