[PATCH v2] [gdb/config/djgpp] Make djcheck.sh and djconfig.sh shellcheck-clean

[Tom de Vries <tdevries@suse.de>]

Make gdb/config/djgpp/{djcheck.sh,djconfig.sh} shellcheck-clean:
- add missing quotes
- add "|| exit 1" after cd
- use printf instead of echo -n
- disable SC2016 for "configure --prefix='${DJDIR}' assuming ${DJDIR} is
  indeed not meant to be expanded

Add a .shellcheckrc to disable SC2006 to allow legacy backticked `...`.

I don't have a djgpp setup, so I can't test this.

Changes in v2:
- disable SC2006

Versions:
- v1 https://sourceware.org/pipermail/gdb-patches/2026-August/229858.html
---
 gdb/config/djgpp/.shellcheckrc |  4 ++
 gdb/config/djgpp/djcheck.sh    | 18 ++++----
 gdb/config/djgpp/djconfig.sh   | 75 +++++++++++++++++-----------------
 gdb/contrib/shellcheck.sh      |  4 +-
 4 files changed, 52 insertions(+), 49 deletions(-)
 create mode 100644 gdb/config/djgpp/.shellcheckrc

diff --git a/gdb/config/djgpp/.shellcheckrc b/gdb/config/djgpp/.shellcheckrc
new file mode 100644
index 00000000000..cef62c6c16f
--- /dev/null
+++ b/gdb/config/djgpp/.shellcheckrc
@@ -0,0 +1,4 @@
+# There's a concern that $(...) is not (sufficiently) supported on DJGPP [1].
+# Disable SC2006 to allow legacy backticked `...`.
+# [1] https://sourceware.org/pipermail/gdb-patches/2026-August/229860.html
+disable=SC2006
diff --git a/gdb/config/djgpp/djcheck.sh b/gdb/config/djgpp/djcheck.sh
index fa75d03f776..e7e03315301 100644
--- a/gdb/config/djgpp/djcheck.sh
+++ b/gdb/config/djgpp/djcheck.sh
@@ -18,30 +18,30 @@
 #  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 ORIGDIR=`pwd`
-GDB=${ORIGDIR}/../gdb.exe
-SUBDIRS=`find $ORIGDIR -type d ! -ipath $ORIGDIR`
+GDB="${ORIGDIR}/../gdb.exe"
+SUBDIRS=`find "$ORIGDIR" -type d ! -ipath "$ORIGDIR"`
 
 for d in $SUBDIRS
 do
-  cd $d
+  cd "$d" || exit 1
   echo "Running tests in $d..."
   for f in *.out
   do
-    test -f $f || break
-    base=`basename $f .out`
+    test -f "$f" || break
+    base=`basename "$f" .out`
     if test "${base}" = "dbx" ; then
 	options=-dbx
     else
 	options=
     fi
-    $GDB ${options} < ${base}.in 2>&1 \
+    $GDB ${options} < "${base}.in" 2>&1 \
       | sed -e '/GNU gdb /s/ [.0-9][.0-9]*//' \
             -e '/^Copyright/s/[12][0-9][0-9][0-9]/XYZZY/g' \
             -e '/Starting program: /s|[A-z]:/.*/||' \
             -e '/main (/s/=0x[0-9a-f][0-9a-f]*/=XYZ/g' \
-      > ${base}.tst
-    if diff --binary -u ${base}.out ${base}.tst ; then
-      rm -f ${base}.tst
+      > "${base}.tst"
+    if diff --binary -u "${base}.out" "${base}.tst" ; then
+      rm -f "${base}.tst"
     fi
   done
 done
diff --git a/gdb/config/djgpp/djconfig.sh b/gdb/config/djgpp/djconfig.sh
index b630e6c0c58..27fea185cae 100644
--- a/gdb/config/djgpp/djconfig.sh
+++ b/gdb/config/djgpp/djconfig.sh
@@ -40,30 +40,30 @@ unset CDPATH
 # then only forward slashes (/) in the directories. It should be
 # an absolute path.
 
-if [ x$1 = x ]; then
+if [ "$1" = "" ]; then
   srcdir=`pwd`
 else
-  srcdir=`cd $1 && pwd`
+  srcdir=`cd "$1" && pwd` || exit 1
   shift
 fi
 
 # Make sure they don't have some file names mangled by untarring.
-echo -n "Checking the unpacked distribution..."
-if ( ! test -f ${srcdir}/bfd/ChangeLog.0203      || \
-     ! test -f ${srcdir}/gdb/ChangeLog.002       || \
-     ! test -f ${srcdir}/opcodes/ChangeLog.0203  || \
-     ! test -f ${srcdir}/readline/config.h-in ) ; then
-  if ( ! test -f ${srcdir}/bfd/ChangeLog.0203 ) ; then
-    notfound=${srcdir}/bfd/ChangeLog.0203
+printf "Checking the unpacked distribution..."
+if ! test -f "${srcdir}/bfd/ChangeLog.0203"      || \
+     ! test -f "${srcdir}/gdb/ChangeLog.002"       || \
+     ! test -f "${srcdir}/opcodes/ChangeLog.0203"  || \
+     ! test -f "${srcdir}/readline/config.h-in"; then
+  if ! test -f "${srcdir}/bfd/ChangeLog.0203"; then
+    notfound="${srcdir}/bfd/ChangeLog.0203"
   else
-    if ( ! test -f ${srcdir}/gdb/ChangeLog.002) ; then
-      notfound=${srcdir}/gdb/ChangeLog.002
+    if ! test -f "${srcdir}/gdb/ChangeLog.002"; then
+      notfound="${srcdir}/gdb/ChangeLog.002"
     else
-      if ( ! test -f ${srcdir}/readline/config.h-in ) ; then
-        notfound=${srcdir}/readline/config.h-in
+      if ! test -f "${srcdir}/readline/config.h-in"; then
+        notfound="${srcdir}/readline/config.h-in"
       else
-        if ( ! test -f ${srcdir}/opcodes/ChangeLog.0203 ) ; then
-          notfound=${srcdir}/opcodes/ChangeLog.0203
+        if ! test -f "${srcdir}/opcodes/ChangeLog.0203"; then
+          notfound="${srcdir}/opcodes/ChangeLog.0203"
         fi
       fi
     fi
@@ -85,7 +85,7 @@ else
 fi
 
 # Where is the directory with DJGPP-specific scripts?
-DJGPPDIR=${srcdir}/gdb/config/djgpp
+DJGPPDIR="${srcdir}/gdb/config/djgpp"
 
 echo "Editing configure scripts for DJGPP..."
 TMPFILE="${TMPDIR-.}/cfg.tmp"
@@ -103,22 +103,22 @@ fi
 # We use explicit /dev/env/DJDIR/bin/find to avoid catching
 # an incompatible DOS/Windows version that might be on their PATH.
 for fix_dir in \
-  `cd $srcdir && /dev/env/DJDIR/bin/find . -type d ! -ipath "${SKIPDIR}" ! -ipath "${SKIPFILES}"`
+  `cd "$srcdir" && /dev/env/DJDIR/bin/find . -type d ! -ipath "${SKIPDIR}" ! -ipath "${SKIPFILES}"`
 do
-  if test ! -f ${fix_dir}/configure.orig ; then
-    if test -f ${srcdir}/${fix_dir}/configure ; then
-      mkdir -p ${fix_dir}
-      cp -p ${srcdir}/${fix_dir}/configure ${fix_dir}/configure.orig
+  if test ! -f "${fix_dir}/configure.orig" ; then
+    if test -f "${srcdir}/${fix_dir}/configure" ; then
+      mkdir -p "${fix_dir}"
+      cp -p "${srcdir}/${fix_dir}/configure" "${fix_dir}/configure.orig"
     fi
   fi
-  if test -f ${fix_dir}/configure.orig ; then
-    sed -f ${DJGPPDIR}/config.sed ${fix_dir}/configure.orig > $TMPFILE
-    update $TMPFILE ${fix_dir}/configure
-    touch ./${fix_dir}/configure -r ${fix_dir}/configure.orig
-    rm -f $TMPFILE
+  if test -f "${fix_dir}/configure.orig" ; then
+    sed -f "${DJGPPDIR}/config.sed" "${fix_dir}/configure.orig" > "$TMPFILE"
+    update "$TMPFILE" "${fix_dir}/configure"
+    touch "./${fix_dir}/configure" -r "${fix_dir}/configure.orig"
+    rm -f "$TMPFILE"
   fi
-  if test -f ${fix_dir}/INSTALL ; then
-    mv ${fix_dir}/INSTALL ${fix_dir}/INSTALL.txt
+  if test -f "${fix_dir}/INSTALL" ; then
+    mv "${fix_dir}/INSTALL" "${fix_dir}/INSTALL.txt"
   fi
 done
 
@@ -134,7 +134,7 @@ export CONFIG_SHELL=/dev/env/DJDIR/bin/sh.exe
 # force to have the ltmain.sh script to be in DOS text format,
 # otherwise the resulting ltconfig script will have mixed
 # (UNIX/DOS) format and is unusable with Bash ports before v2.03.
-utod $srcdir/ltmain.sh
+utod "$srcdir/ltmain.sh"
 
 # Give the configure script some hints:
 export LD=ld
@@ -159,16 +159,16 @@ export lt_cv_sys_max_cmd_len=12288
 # Force depcomp to use _deps rather than .deps as the name of the
 # subdirectory where the *.Po dependency files are put.  File names
 # with leading dots are invalid on DOS 8+3 filesystems.
-export DEPDIR=${DEPDIR:-_deps}
+export DEPDIR="${DEPDIR:-_deps}"
 
 # The configure script needs to see the `install-sh' script, otherwise
 # it decides the source installation is broken.  But "make install" will
 # fail on 8+3 filesystems if it finds a file `install-', since there
 # are numerous "install-foo" targets in Makefile's.  So we rename the
 # offending file after the configure step is done.
-if test ! -f ${srcdir}/install-sh ; then
-  if test -f ${srcdir}/install-.sh ; then
-    mv ${srcdir}/install-.sh ${srcdir}/install-sh
+if test ! -f "${srcdir}/install-sh" ; then
+  if test -f "${srcdir}/install-.sh" ; then
+    mv "${srcdir}/install-.sh" "${srcdir}/install-sh"
   fi
 fi
 
@@ -176,10 +176,11 @@ fi
 # support, which is nearly impossible to be supported in the current way,
 # since it relies on file names which will never work on DOS.
 echo "Running the configure script..."
-$srcdir/configure --srcdir="$srcdir" --prefix='${DJDIR}' \
+# shellcheck disable=SC2016 # $DJDIR is not expanded here.
+"$srcdir/configure" --srcdir="$srcdir" --prefix='${DJDIR}' \
   --disable-shared --disable-nls --verbose --enable-build-warnings=\
--Wimplicit,-Wcomment,-Wformat,-Wparentheses,-Wpointer-arith,-Wuninitialized $*
+-Wimplicit,-Wcomment,-Wformat,-Wparentheses,-Wpointer-arith,-Wuninitialized "$@"
 
-if test -f ${srcdir}/install- ; then
-  mv ${srcdir}/install- ${srcdir}/install-.sh
+if test -f "${srcdir}/install-" ; then
+  mv "${srcdir}/install-" "${srcdir}/install-.sh"
 fi
diff --git a/gdb/contrib/shellcheck.sh b/gdb/contrib/shellcheck.sh
index ad59e2b0871..6f5634ce38e 100755
--- a/gdb/contrib/shellcheck.sh
+++ b/gdb/contrib/shellcheck.sh
@@ -41,9 +41,7 @@ for f in "$@"; do
 	    # Skip generated files.
 	    continue
 	    ;;
-	gdb/config/djgpp/djcheck.sh \
-	    | gdb/config/djgpp/djconfig.sh \
-	    | gdb/contrib/gdb-add-index.sh \
+	gdb/contrib/gdb-add-index.sh \
 	    | gdb/gdb_buildall.sh \
 	    | gdb/gdb_mbuild.sh )
 	    # Skip unclean files.

base-commit: 2e9a026c2cd76b09f863ba877a1c492ebda76ee0
-- 
2.51.0