libctf: require a Tcl capable of try/catch to run tests

The run_native_host_cmd implementation in testsuite/lib/ctf-lib.exp
uses try/catch, which are new in Tcl 8.6.  Require a Tcl that knows
that try exists, as suggested by Jan Beulich.

libctf/ChangeLog
2021-02-03  Nick Alcock  <nick.alcock@oracle.com>

	* configure.ac (EXPECT): Check for, in order to define...
	(TCL_TRY): ... this, if Tcl supports try/catch.
	* Makefile.am (TCL_TRY): Run the testsuite only if set.
	* configure: Regenerated.
	* Makefile.in: Likewise.

1 files changed, 71 insertions, 2 deletions

diff --git a/libctf/configure b/libctf/configure
index bef55bb..902eadd 100755
--- a/libctf/configure
+++ b/libctf/configure
@@ -636,6 +636,9 @@ am__EXEEXT_TRUE
 LTLIBOBJS
 LIBOBJS
 VERSION_FLAGS
+TCL_TRY_FALSE
+TCL_TRY_TRUE
+EXPECT
 CTF_LIBADD
 SHARED_LDFLAGS
 NEED_CTF_QSORT_R_FALSE
@@ -11539,7 +11542,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11542 "configure"
+#line 11545 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -11645,7 +11648,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11648 "configure"
+#line 11651 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -13391,6 +13394,68 @@ fi
 
 
 
+# Extract the first word of "expect", so it can be a program name with args.
+set dummy expect; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_EXPECT+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $EXPECT in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_EXPECT="$EXPECT" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_EXPECT="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+EXPECT=$ac_cv_path_EXPECT
+if test -n "$EXPECT"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $EXPECT" >&5
+$as_echo "$EXPECT" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for Tcl supporting try/catch" >&5
+$as_echo_n "checking for Tcl supporting try/catch... " >&6; }
+if ${ac_cv_libctf_tcl_try+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_cv_libctf_tcl_try=`if test -z $EXPECT; then echo no; else $EXPECT << EOF
+if [llength [info commands try]] then { puts yes } else { puts no }
+EOF
+fi`
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_libctf_tcl_try" >&5
+$as_echo "$ac_cv_libctf_tcl_try" >&6; }
+ if test "${ac_cv_libctf_tcl_try}" = yes; then
+  TCL_TRY_TRUE=
+  TCL_TRY_FALSE='#'
+else
+  TCL_TRY_TRUE='#'
+  TCL_TRY_FALSE=
+fi
+
+
 # Use a version script, if possible, or an -export-symbols-regex otherwise.
 VERSION_FLAGS='-export-symbols-regex ctf_.*'
 if $LD --help 2>&1 | grep -- --version-script >/dev/null; then
@@ -13552,6 +13617,10 @@ if test -z "${NEED_CTF_QSORT_R_TRUE}" && test -z "${NEED_CTF_QSORT_R_FALSE}"; th
   as_fn_error $? "conditional \"NEED_CTF_QSORT_R\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
 fi
+if test -z "${TCL_TRY_TRUE}" && test -z "${TCL_TRY_FALSE}"; then
+  as_fn_error $? "conditional \"TCL_TRY\" was never defined.
+Usually this means the macro was only invoked conditionally." "$LINENO" 5
+fi
 
 : "${CONFIG_STATUS=./config.status}"
 ac_write_fail=0