progname=$0
package=gnulib
-cvsdatestamp='$Date: 2007-06-23 07:40:58 $'
+cvsdatestamp='$Date: 2007-06-23 09:52:09 $'
last_checkin_date=`echo "$cvsdatestamp" | sed -e 's,^\$[D]ate: ,,'`
version=`echo "$last_checkin_date" | sed -e 's/ .*$//' -e 's,/,-,g'`
nl='
# Test cases:
# echo '\n' | wc -l prints 1 when OK, 2 when KO
# echo '\t' | grep t > /dev/null has return code 0 when OK, 1 when KO
-# This problem is a weird heritage from SVR4. BSD got it right.
+# This problem is a weird heritage from SVR4. BSD got it right (except that
+# BSD echo interprets '-n' as an option, which is also not desirable).
# Nowadays the problem occurs in 4 situations:
-# - in bash, when the shell option xpg_echo is set,
+# - in bash, when the shell option xpg_echo is set (bash >= 2.04)
+# or when it was built with --enable-usg-echo-default (bash >= 2.0)
+# or when it was built with DEFAULT_ECHO_TO_USG (bash < 2.0),
# - in zsh, when sh-emulation is not set,
# - in ksh (e.g. AIX /bin/sh and Solaris /usr/xpg4/bin/sh are ksh instances,
# and HP-UX /bin/sh and IRIX /bin/sh behave similarly),
# - in Solaris /bin/sh and OSF/1 /bin/sh.
# We try the following workarounds:
# - for all: respawn using $CONFIG_SHELL if that is set and works.
-# - for bash: unset the shell option xpg_echo.
+# - for bash >= 2.04: unset the shell option xpg_echo.
+# - for bash >= 2.0: define echo to a function that uses the printf built-in.
+# - for bash < 2.0: define echo to a function that uses cat of a here document.
# - for zsh: turn sh-emulation on.
# - for ksh: alias echo to a function that uses cat of a here document.
# - for Solaris /bin/sh: respawn using /bin/ksh and rely on the ksh workaround.
exec $CONFIG_SHELL "$0" --no-reexec "$@"
exit 127
fi
-# For bash: unset the shell option xpg_echo.
+# For bash >= 2.04: unset the shell option xpg_echo.
if test -z "$have_echo" \
&& test -n "$BASH_VERSION" \
&& (shopt -o xpg_echo; echo '\t' | grep t > /dev/null) 2>/dev/null; then
shopt -o xpg_echo
have_echo=yes
fi
+# For bash >= 2.0: define echo to a function that uses the printf built-in.
+# For bash < 2.0: define echo to a function that uses cat of a here document.
+# (There is no win in using 'printf' over 'cat' if it is not a shell built-in.)
+if test -z "$have_echo" \
+ && test -n "$BASH_VERSION"; then \
+ if type printf 2>/dev/null | grep / > /dev/null; then
+ # 'printf' is not a shell built-in.
+echo ()
+{
+cat <<EOF
+$*
+EOF
+}
+ else
+ # 'printf' is a shell built-in. Now it's safe to define 'echo'.
+echo ()
+{
+ printf '%s\n' "$*"
+}
+ fi
+ if echo '\t' | grep t > /dev/null; then
+ have_echo=yes
+ fi
+fi
# For zsh: turn sh-emulation on.
if test -z "$have_echo" \
&& test -n "$ZSH_VERSION" \
# Therefore, for an alias to take effect, the alias definition command has
# to be executed before the command which references the alias is read."
# Because of this, we have to play strange tricks with have_echo, to ensure
-# that the top-level statement containing the test start after the 'alias'
+# that the top-level statement containing the test starts after the 'alias'
# command.
if test -z "$have_echo"; then
bsd_echo ()
# Test cases:
# echo '\n' | wc -l prints 1 when OK, 2 when KO
# echo '\t' | grep t > /dev/null has return code 0 when OK, 1 when KO
-# This problem is a weird heritage from SVR4. BSD got it right.
+# This problem is a weird heritage from SVR4. BSD got it right (except that
+# BSD echo interprets '-n' as an option, which is also not desirable).
# Nowadays the problem occurs in 4 situations:
-# - in bash, when the shell option xpg_echo is set,
+# - in bash, when the shell option xpg_echo is set (bash >= 2.04)
+# or when it was built with --enable-usg-echo-default (bash >= 2.0)
+# or when it was built with DEFAULT_ECHO_TO_USG (bash < 2.0),
# - in zsh, when sh-emulation is not set,
# - in ksh (e.g. AIX /bin/sh and Solaris /usr/xpg4/bin/sh are ksh instances,
# and HP-UX /bin/sh and IRIX /bin/sh behave similarly),
# - in Solaris /bin/sh and OSF/1 /bin/sh.
# We try the following workarounds:
# - for all: respawn using $CONFIG_SHELL if that is set and works.
-# - for bash: unset the shell option xpg_echo.
+# - for bash >= 2.04: unset the shell option xpg_echo.
+# - for bash >= 2.0: define echo to a function that uses the printf built-in.
+# - for bash < 2.0: define echo to a function that uses cat of a here document.
# - for zsh: turn sh-emulation on.
# - for ksh: alias echo to a function that uses cat of a here document.
# - for Solaris /bin/sh: respawn using /bin/ksh and rely on the ksh workaround.
exec $CONFIG_SHELL "$0" --no-reexec "$@"
exit 127
fi
-# For bash: unset the shell option xpg_echo.
+# For bash >= 2.04: unset the shell option xpg_echo.
if test -z "$have_echo" \
&& test -n "$BASH_VERSION" \
&& (shopt -o xpg_echo; echo '\t' | grep t > /dev/null) 2>/dev/null; then
shopt -o xpg_echo
have_echo=yes
fi
+# For bash >= 2.0: define echo to a function that uses the printf built-in.
+# For bash < 2.0: define echo to a function that uses cat of a here document.
+# (There is no win in using 'printf' over 'cat' if it is not a shell built-in.)
+if test -z "$have_echo" \
+ && test -n "$BASH_VERSION"; then \
+ if type printf 2>/dev/null | grep / > /dev/null; then
+ # 'printf' is not a shell built-in.
+echo ()
+{
+cat <<EOF
+$*
+EOF
+}
+ else
+ # 'printf' is a shell built-in. Now it's safe to define 'echo'.
+echo ()
+{
+ printf '%s\n' "$*"
+}
+ fi
+ if echo '\t' | grep t > /dev/null; then
+ have_echo=yes
+ fi
+fi
# For zsh: turn sh-emulation on.
if test -z "$have_echo" \
&& test -n "$ZSH_VERSION" \
# Therefore, for an alias to take effect, the alias definition command has
# to be executed before the command which references the alias is read."
# Because of this, we have to play strange tricks with have_echo, to ensure
-# that the top-level statement containing the test start after the 'alias'
+# that the top-level statement containing the test starts after the 'alias'
# command.
if test -z "$have_echo"; then
bsd_echo ()
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