lib/*.sh, lib/*/*.sh: Rewrite include guards.

This is one step toward adding `set -u` to opkhelper utilities.

8 files changed, 16 insertions, 16 deletions

diff --git a/lib/buildsystem.sh b/lib/buildsystem.sh
index 39dcceb..0d695c8 100644
--- a/lib/buildsystem.sh
+++ b/lib/buildsystem.sh
@@ -17,8 +17,8 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-[ -n "${_OH_BUILDSYSTEM_SM}" ] && return 0
-_OH_BUILDSYSTEM_SM='true'
+[ "x${_OH_BUILDSYSTEM_SM+set}" = 'xset' ] && return 0
+_OH_BUILDSYSTEM_SM=1
 
 _OH_BUILDSYSTEMS='
 autoconf
diff --git a/lib/buildsystem/autoconf.sh b/lib/buildsystem/autoconf.sh
index 35ae452..232ca0d 100644
--- a/lib/buildsystem/autoconf.sh
+++ b/lib/buildsystem/autoconf.sh
@@ -17,8 +17,8 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-[ -n "${_OH_BUILDSYSTEM_AUTOCONF_SM}" ] && return 0
-_OH_BUILDSYSTEM_AUTOCONF_SM='true'
+[ "x${_OH_BUILDSYSTEM_AUTOCONF_SM+set}" = 'xset' ] && return 0
+_OH_BUILDSYSTEM_AUTOCONF_SM=1
 
 _oh_autoconf_can_configure()
 {
diff --git a/lib/buildsystem/kbuild.sh b/lib/buildsystem/kbuild.sh
index 8db2f59..3d6fd1b 100644
--- a/lib/buildsystem/kbuild.sh
+++ b/lib/buildsystem/kbuild.sh
@@ -17,8 +17,8 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-[ -n "${_OH_BUILDSYSTEM_KBUILD_SM}" ] && return 0
-_OH_BUILDSYSTEM_KBUILD_SM='true'
+[ "x${_OH_BUILDSYSTEM_KBUILD_SM+set}" = 'xset' ] && return 0
+_OH_BUILDSYSTEM_KBUILD_SM=1
 
 _oh_kbuild_can_configure()
 {
diff --git a/lib/buildsystem/make.sh b/lib/buildsystem/make.sh
index ef34e16..7ed9dc0 100644
--- a/lib/buildsystem/make.sh
+++ b/lib/buildsystem/make.sh
@@ -17,8 +17,8 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-[ -n "${_OH_BUILDSYSTEM_MAKE_SM}" ] && return 0
-_OH_BUILDSYSTEM_MAKE_SM='true'
+[ "x${_OH_BUILDSYSTEM_MAKE_SM+set}" = 'xset' ] && return 0
+_OH_BUILDSYSTEM_MAKE_SM=1
 
 _oh_make_can_configure()
 {
diff --git a/lib/common.sh b/lib/common.sh
index 73e0554..64d0602 100644
--- a/lib/common.sh
+++ b/lib/common.sh
@@ -17,8 +17,8 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-[ -n "${_OH_COMMON_SM}" ] && return 0
-_OH_COMMON_SM='true'
+[ "x${_OH_COMMON_SM+set}" = 'xset' ] && return 0
+_OH_COMMON_SM=1
 
 oh_init()
 {
diff --git a/lib/load.sh b/lib/load.sh
index 9af4958..a21ca52 100644
--- a/lib/load.sh
+++ b/lib/load.sh
@@ -17,8 +17,8 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-[ -n "${_OH_LOAD_SM}" ] && return 0
-_OH_LOAD_SM='true'
+[ "x${_OH_LOAD_SM+set}" = 'xset' ] && return 0
+_OH_LOAD_SM=1
 
 # The "common" module is used by this and all other modules.
 # We have to manually load the "common" module so we can use it in oh_use.
diff --git a/lib/locale.sh b/lib/locale.sh
index 6b31b1a..103e734 100644
--- a/lib/locale.sh
+++ b/lib/locale.sh
@@ -17,8 +17,8 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-[ -n "${_OH_LOCALE_SM}" ] && return 0
-_OH_LOCALE_SM='true'
+[ "x${_OH_LOCALE_SM+set}" = 'xset' ] && return 0
+_OH_LOCALE_SM=1
 
 oh_use output
 
diff --git a/lib/output.sh b/lib/output.sh
index 9459e37..fe898ad 100644
--- a/lib/output.sh
+++ b/lib/output.sh
@@ -17,8 +17,8 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-[ -n "${_OH_OUTPUT_SM}" ] && return 0
-_OH_OUTPUT_SM='true'
+[ "x${_OH_OUTPUT_SM+set}" = 'xset' ] && return 0
+_OH_OUTPUT_SM=1
 
 oh_error()
 {