The first form is easier to implement and directly available in BusyBox.
https://pubs.opengroup.org/onlinepubs/9699919799/utilities/test.html

This change has also been done in make and cmake.
https://git.savannah.gnu.org/cgit/make.git/commit/?id=c8a6263
https://gitlab.kitware.com/cmake/cmake/-/merge_requests/4704

Signed-off-by: Issam E. Maghni <issam.e.mag...@mailbox.org>
---
 lib/config.guess | 24 ++++++++++++------------
 lib/config.sub   |  2 +-
 2 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/lib/config.guess b/lib/config.guess
index 45001cfec..55d5edb36 100755
--- a/lib/config.guess
+++ b/lib/config.guess
@@ -404,7 +404,7 @@ case 
"$UNAME_MACHINE:$UNAME_SYSTEM:$UNAME_RELEASE:$UNAME_VERSION" in
        # If there is a compiler, see if it is configured for 64-bit objects.
        # Note that the Sun cc does not turn __LP64__ into 1 like gcc does.
        # This test works for both compilers.
-       if [ "$CC_FOR_BUILD" != no_compiler_found ]; then
+       if test "$CC_FOR_BUILD" != no_compiler_found; then
            if (echo '#ifdef __amd64'; echo IS_64BIT_ARCH; echo '#endif') | \
                (CCOPTS="" $CC_FOR_BUILD -E - 2>/dev/null) | \
                grep IS_64BIT_ARCH >/dev/null
@@ -544,10 +544,10 @@ EOF
     AViiON:dgux:*:*)
        # DG/UX returns AViiON for all architectures
        UNAME_PROCESSOR=`/usr/bin/uname -p`
-       if [ "$UNAME_PROCESSOR" = mc88100 ] || [ "$UNAME_PROCESSOR" = mc88110 ]
+       if test "$UNAME_PROCESSOR" = mc88100 || test "$UNAME_PROCESSOR" = 
mc88110
        then
-           if [ "$TARGET_BINARY_INTERFACE"x = m88kdguxelfx ] || \
-              [ "$TARGET_BINARY_INTERFACE"x = x ]
+           if test "$TARGET_BINARY_INTERFACE"x = m88kdguxelfx || \
+              test "$TARGET_BINARY_INTERFACE"x = x
            then
                echo m88k-dg-dgux"$UNAME_RELEASE"
            else
@@ -580,7 +580,7 @@ EOF
        echo i386-ibm-aix
        exit ;;
     ia64:AIX:*:*)
-       if [ -x /usr/bin/oslevel ] ; then
+       if test -x /usr/bin/oslevel; then
                IBM_REV=`/usr/bin/oslevel`
        else
                IBM_REV="$UNAME_VERSION.$UNAME_RELEASE"
@@ -620,7 +620,7 @@ EOF
        else
                IBM_ARCH=powerpc
        fi
-       if [ -x /usr/bin/lslpp ] ; then
+       if test -x /usr/bin/lslpp; then
                IBM_REV=`/usr/bin/lslpp -Lqc bos.rte.libc |
                           awk -F: '{ print $3 }' | sed s/[0-9]*$/0/`
        else
@@ -655,7 +655,7 @@ EOF
            9000/31?)            HP_ARCH=m68000 ;;
            9000/[34]??)         HP_ARCH=m68k ;;
            9000/[678][0-9][0-9])
-               if [ -x /usr/bin/getconf ]; then
+               if test -x /usr/bin/getconf; then
                    sc_cpu_version=`/usr/bin/getconf SC_CPU_VERSION 2>/dev/null`
                    sc_kernel_bits=`/usr/bin/getconf SC_KERNEL_BITS 2>/dev/null`
                    case "$sc_cpu_version" in
@@ -669,7 +669,7 @@ EOF
                        esac ;;
                    esac
                fi
-               if [ "$HP_ARCH" = "" ]; then
+               if test "$HP_ARCH" = ""; then
                    set_cc_for_build
                    sed 's/^            //' << EOF > "$dummy.c"
 
@@ -708,7 +708,7 @@ EOF
                    test -z "$HP_ARCH" && HP_ARCH=hppa
                fi ;;
        esac
-       if [ "$HP_ARCH" = hppa2.0w ]
+       if test "$HP_ARCH" = hppa2.0w
        then
            set_cc_for_build
 
@@ -782,7 +782,7 @@ EOF
        echo hppa1.0-hp-osf
        exit ;;
     i*86:OSF1:*:*)
-       if [ -x /usr/sbin/sysversion ] ; then
+       if test -x /usr/sbin/sysversion; then
            echo "$UNAME_MACHINE"-unknown-osf1mk
        else
            echo "$UNAME_MACHINE"-unknown-osf1
@@ -1284,7 +1284,7 @@ EOF
        echo mips-sony-newsos6
        exit ;;
     R[34]000:*System_V*:*:* | R4000:UNIX_SYSV:*:* | R*000:UNIX_SV:*:*)
-       if [ -d /usr/nec ]; then
+       if test -d /usr/nec; then
                echo mips-nec-sysv"$UNAME_RELEASE"
        else
                echo mips-unknown-sysv"$UNAME_RELEASE"
@@ -1346,7 +1346,7 @@ EOF
        else
            set_cc_for_build
        fi
-       if [ "$CC_FOR_BUILD" != no_compiler_found ]; then
+       if test "$CC_FOR_BUILD" != no_compiler_found; then
            if (echo '#ifdef __LP64__'; echo IS_64BIT_ARCH; echo '#endif') | \
                   (CCOPTS="" $CC_FOR_BUILD -E - 2>/dev/null) | \
                   grep IS_64BIT_ARCH >/dev/null
diff --git a/lib/config.sub b/lib/config.sub
index f02d43ad5..814f2527b 100755
--- a/lib/config.sub
+++ b/lib/config.sub
@@ -1275,7 +1275,7 @@ esac
 
 # Decode manufacturer-specific aliases for certain operating systems.
 
-if [ x$os != x ]
+if test x$os != x
 then
 case $os in
        # First match some system type aliases that might get confused
-- 
2.28.0


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