[SCM] GNU Autoconf source repository branch, master, updated. v2.67-45-g3037845

[Eric Blake]

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- Log -----------------------------------------------------------------
commit 30378453ea71e8a53c3dcc401ffa64b43353a64b
Author: Eric Blake <address@hidden>
Date:   Mon Aug 30 09:51:11 2010 -0600

    fortran: always avoid AC_LANG_CONFTEST warning
    
    * lib/autoconf/lang.m4 (AC_LANG_CONFTEST()): Make the default
    match the fact that the default AC_LANG_SOURCE does not inline
    confdefs.h in the first place.
    * lib/autoconf/fortran.m4 (AC_FC_FREEFORM, AC_FC_FIXEDFORM)
    (AC_FC_LINE_LENGTH, __AC_FC_NAME_MANGLING): Revert previous use of
    AC_LANG_DEFINES_PROVIDED.
    Suggested by Ralf Wildenhues.
    
    Signed-off-by: Eric Blake <address@hidden>

commit d97d8a7d049e6474431140001fdd80ef14c84abe
Author: Eric Blake <address@hidden>
Date:   Fri Aug 27 13:15:22 2010 -0600

    config.status: minimize use of $tmp
    
    * lib/autoconf/status.m4 (_AC_OUTPUT_MAIN_LOOP)
    (_AC_OUTPUT_FILES_PREPARE, _AC_OUTPUT_FILE)
    (_AC_OUTPUT_HEADERS_PREPARE, _AC_OUTPUT_HEADER): Use $ac_tmp
    internally, while preserving $tmp for existing users.
    * tests/torture.at (AC_CONFIG_COMMANDS with temporary directory):
    New test, that $tmp is available but not essential.
    
    Signed-off-by: Eric Blake <address@hidden>

commit 6284d1bef725b4e038472e4b31605f84f2f77f96
Author: Eric Blake <address@hidden>
Date:   Fri Aug 27 12:55:54 2010 -0600

    docs: avoid use of $tmp outside of config.status use
    
    * doc/autoconf.texi (Polymorphic Variables, Shell Substitutions):
    Use $var or $t instead.
    (Limitations of Usual Tools): Use $dir instead.
    (Initialization Macros) <AS_TMPDIR>: Make good on the NEWS
    regarding AS_TMPDIR being documented as consuming $tmp.
    Suggested by Ralf Wildenhues.
    
    Signed-off-by: Eric Blake <address@hidden>

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog               |   27 +++++++++++++++++++++
 doc/autoconf.texi       |   55 ++++++++++++++++++++++++++++++++-----------
 lib/autoconf/fortran.m4 |   10 ++++----
 lib/autoconf/lang.m4    |    6 ++++-
 lib/autoconf/status.m4  |   60 +++++++++++++++++++++++++---------------------
 tests/torture.at        |   28 ++++++++++++++++++++++
 6 files changed, 139 insertions(+), 47 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 8ddf026..5d3ac87 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,30 @@
+2010-08-30  Eric Blake  <address@hidden>
+
+       fortran: always avoid AC_LANG_CONFTEST warning
+       * lib/autoconf/lang.m4 (AC_LANG_CONFTEST()): Make the default
+       match the fact that the default AC_LANG_SOURCE does not inline
+       confdefs.h in the first place.
+       * lib/autoconf/fortran.m4 (AC_FC_FREEFORM, AC_FC_FIXEDFORM)
+       (AC_FC_LINE_LENGTH, __AC_FC_NAME_MANGLING): Revert previous use of
+       AC_LANG_DEFINES_PROVIDED.
+       Suggested by Ralf Wildenhues.
+
+       config.status: minimize use of $tmp
+       * lib/autoconf/status.m4 (_AC_OUTPUT_MAIN_LOOP)
+       (_AC_OUTPUT_FILES_PREPARE, _AC_OUTPUT_FILE)
+       (_AC_OUTPUT_HEADERS_PREPARE, _AC_OUTPUT_HEADER): Use $ac_tmp
+       internally, while preserving $tmp for existing users.
+       * tests/torture.at (AC_CONFIG_COMMANDS with temporary directory):
+       New test, that $tmp is available but not essential.
+
+       docs: avoid use of $tmp outside of config.status use
+       * doc/autoconf.texi (Polymorphic Variables, Shell Substitutions):
+       Use $var or $t instead.
+       (Limitations of Usual Tools): Use $dir instead.
+       (Initialization Macros) <AS_TMPDIR>: Make good on the NEWS
+       regarding AS_TMPDIR being documented as consuming $tmp.
+       Suggested by Ralf Wildenhues.
+
 2010-08-29  Paul Eggert  <address@hidden>
 
        AC_PROG_YACC: fix comment re what "yacc" stands for
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index 19f00bd..840b4fe 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -13442,8 +13442,8 @@ results in a script that will output the line 
@samp{hello} three times.
 AC_DEFUN([MY_ACTION],
 [AS_LITERAL_IF([$1],
   [echo "$$1"],
-  [AS_VAR_COPY([tmp], [$1])
-   echo "$tmp"],
+  [AS_VAR_COPY([var], [$1])
+   echo "$var"],
   [eval 'echo "$'"$1"\"])])
 foo=bar bar=hello
 MY_ACTION([bar])
@@ -13462,8 +13462,8 @@ efficient scaling.
 For situations where the final contents of @var{var} are relatively
 short (less than 256 bytes), it is more efficient to use the simpler
 code sequence of @address@hidden@address@hidden@address@hidden (or its
-polymorphic equivalent of @code{AS_VAR_COPY([tmp], address@hidden)} and
address@hidden(address@hidden, ["$tmp"@var{text}])}).  But in the case
+polymorphic equivalent of @code{AS_VAR_COPY([t], address@hidden)} and
address@hidden(address@hidden, ["$t"@var{text}])}).  But in the case
 when the script will be repeatedly appending text into @code{var},
 issues of scaling start to become apparent.  A naive implementation
 requires execution time linear to the length of the current contents of
@@ -13702,6 +13702,33 @@ script.  This macro is automatically invoked by 
@code{AC_INIT} in
 configure scripts.
 @end defmac
 
address@hidden AS_TMPDIR (@var{prefix}, @dvar{dir, 
address@hidden:=/address@hidden)
address@hidden
address@hidden TMPDIR
address@hidden tmp
+Create, as safely as possible, a temporary sub-directory within
address@hidden with a name starting with @var{prefix}.  @var{prefix} should
+be 2-4 characters, to make it slightly easier to identify the owner of
+the directory.  If @var{dir} is omitted, then the value of @env{TMPDIR}
+will be used (defaulting to @samp{/tmp}).  On success, the name of the
+newly created directory is stored in the shell variable @code{tmp}.  On
+error, the script is aborted.
+
+Typically, this macro is coupled with some exit traps to delete the created
+directory and its contents on exit or interrupt.  However, there is a
+slight window between when the directory is created and when the name is
+actually known to the shell, so an interrupt at the right moment might
+leave the temporary directory behind.  Hence it is important to use a
address@hidden that makes it easier to determine if a leftover temporary
+directory from an interrupted script is safe to delete.
+
+The use of the output variable @samp{$tmp} rather than something in the
address@hidden namespace is historical; it has the unfortunate consequence
+that reusing this otherwise common name for any other purpose inside
+your script has the potential to break any cleanup traps designed to
+remove the temporary directory.
address@hidden defmac
+
 @defmac AS_SHELL_SANITIZE
 @asindex{SHELL_SANITIZE}
 Initialize the shell suitably for @command{configure} scripts.  This has
@@ -15475,15 +15502,15 @@ b  c
 
 Perhaps the easiest way to work around quoting issues in a manner
 portable to all shells is to place the results in a temporary variable,
-then use @samp{$tmp} as the @var{value}, rather than trying to inline
+then use @samp{$t} as the @var{value}, rather than trying to inline
 the expression needing quoting.
 
 @example
-$ @kbd{/bin/sh -c 'tmp="a  b\"'\''@}\\"; echo "address@hidden@}"'}
+$ @kbd{/bin/sh -c 't="a  b\"'\''@}\\"; echo "address@hidden@}"'}
 b  c"'@}\
-$ @kbd{ksh -c 'tmp="a  b\"'\''@}\\"; echo "address@hidden@}"'}
+$ @kbd{ksh -c 't="a  b\"'\''@}\\"; echo "address@hidden@}"'}
 b  c"'@}\
-$ @kbd{bash -c 'tmp="a  b\"'\''@}\\"; echo "address@hidden@}"'}
+$ @kbd{bash -c 't="a  b\"'\''@}\\"; echo "address@hidden@}"'}
 b  c"'@}\
 @end example
 
@@ -18428,22 +18455,22 @@ use a file inside this directory.  Both methods 
prevent attackers from
 gaining control, though @command{mktemp} is far less likely to fail
 gratuitously under attack.
 
-Here is sample code to create a new temporary directory safely:
+Here is sample code to create a new temporary directory @samp{$dir} safely:
 
 @example
-# Create a temporary directory $tmp in $TMPDIR (default /tmp).
+# Create a temporary directory $dir in $TMPDIR (default /tmp).
 # Use mktemp if possible; otherwise fall back on mkdir,
 # with $RANDOM to make collisions less likely.
 : "address@hidden:=/address@hidden"
 @{
-  tmp=`
+  dir=`
     (umask 077 && mktemp -d "$TMPDIR/fooXXXXXX") 2>/dev/null
   ` &&
-  test -n "$tmp" && test -d "$tmp"
+  test -d "$dir"
 @} || @{
-  tmp=$TMPDIR/foo$$-$RANDOM
+  dir=$TMPDIR/foo$$-$RANDOM
 @c $$ restore font-lock
-  (umask 077 && mkdir "$tmp")
+  (umask 077 && mkdir "$dir")
 @} || exit $?
 @end example
 
diff --git a/lib/autoconf/fortran.m4 b/lib/autoconf/fortran.m4
index 5e48468..e8f7bbc 100644
--- a/lib/autoconf/fortran.m4
+++ b/lib/autoconf/fortran.m4
@@ -897,8 +897,8 @@ AC_DEFUN([__AC_FC_NAME_MANGLING],
 [_AC_FORTRAN_ASSERT()dnl
 AC_CACHE_CHECK([for _AC_LANG name-mangling scheme],
               ac_cv_[]_AC_LANG_ABBREV[]_mangling,
-[AC_COMPILE_IFELSE([AC_LANG_DEFINES_PROVIDED
-[      subroutine foobar()
+[AC_COMPILE_IFELSE(
+[[      subroutine foobar()
       return
       end
       subroutine foo_bar()
@@ -1186,7 +1186,7 @@ for ac_flag in none -ffree-form -FR -free -qfree -Mfree 
-Mfreeform \
 do
   test "x$ac_flag" != xnone && FCFLAGS="$ac_fc_freeform_FCFLAGS_save $ac_flag"
 dnl Use @&t@ below to ensure that editors don't turn 8+ spaces into tab.
-  AC_COMPILE_IFELSE([AC_LANG_DEFINES_PROVIDED[
+  AC_COMPILE_IFELSE([[
   program freeform
        ! FIXME: how to best confuse non-freeform compilers?
        print *, 'Hello ', &
@@ -1241,7 +1241,7 @@ for ac_flag in none -ffixed-form -fixed -qfixed -Mfixed 
-fixedform "-f fixed" \
               +source=fixed -fix
 do
   test "x$ac_flag" != xnone && FCFLAGS="$ac_fc_fixedform_FCFLAGS_save $ac_flag"
-  AC_COMPILE_IFELSE([AC_LANG_DEFINES_PROVIDED[
+  AC_COMPILE_IFELSE([[
 C     This comment should confuse free-form compilers.
       program main
       end]],
@@ -1324,7 +1324,7 @@ for ac_flag in none \
               "-W $ac_fc_line_len" +extend_source -wide -e
 do
   test "x$ac_flag" != xnone && FCFLAGS="$ac_fc_line_length_FCFLAGS_save 
$ac_flag"
-  AC_COMPILE_IFELSE([AC_LANG_DEFINES_PROVIDED[$ac_fc_line_length_test
+  AC_COMPILE_IFELSE([[$ac_fc_line_length_test
       end subroutine]],
                    [ac_cv_fc_line_length=$ac_flag; break])
 done
diff --git a/lib/autoconf/lang.m4 b/lib/autoconf/lang.m4
index bd4b68b..d2e98f9 100644
--- a/lib/autoconf/lang.m4
+++ b/lib/autoconf/lang.m4
@@ -201,9 +201,13 @@ AC_DEFUN([AC_LANG_CONFTEST],
 # AC_LANG_CONFTEST()(BODY)
 # ------------------------
 # Default implementation of AC_LANG_CONFTEST.
+# This version assumes that you can't inline confdefs.h into your
+# language, and as such, it is safe to blindly call
+# AC_LANG_DEFINES_PROVIDED.  Language-specific overrides should
+# remove this call if AC_LANG_SOURCE does inline confdefs.h.
 m4_define([AC_LANG_CONFTEST()],
 [cat > conftest.$ac_ext <<_ACEOF
-$1
+AC_LANG_DEFINES_PROVIDED[]$1
 _ACEOF])
 
 # AC_LANG_DEFINES_PROVIDED
diff --git a/lib/autoconf/status.m4 b/lib/autoconf/status.m4
index 9bd0a50..07889ae 100644
--- a/lib/autoconf/status.m4
+++ b/lib/autoconf/status.m4
@@ -373,21 +373,21 @@ dnl Define the pipe that does the substitution.
 m4_ifdef([_AC_SUBST_FILES],
 [m4_define([_AC_SUBST_CMDS], [|
 if $ac_cs_awk_getline; then
-  $AWK -f "$tmp/subs.awk"
+  $AWK -f "$ac_tmp/subs.awk"
 else
-  $AWK -f "$tmp/subs.awk" | $SHELL
+  $AWK -f "$ac_tmp/subs.awk" | $SHELL
 fi])],
 [m4_define([_AC_SUBST_CMDS],
-[| $AWK -f "$tmp/subs.awk"])])dnl
+[| $AWK -f "$ac_tmp/subs.awk"])])dnl
 
-echo 'BEGIN {' >"$tmp/subs1.awk" &&
+echo 'BEGIN {' >"$ac_tmp/subs1.awk" &&
 _ACEOF
 
 m4_ifdef([_AC_SUBST_FILES],
 [# Create commands to substitute file output variables.
 {
   echo "cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1" &&
-  echo 'cat >>"\$tmp/subs1.awk" <<\\_ACAWK &&' &&
+  echo 'cat >>"\$ac_tmp/subs1.awk" <<\\_ACAWK &&' &&
   echo "$ac_subst_files" | sed 's/.*/F@<:@"&"@:>@="$&"/' &&
   echo "_ACAWK" &&
   echo "_ACEOF"
@@ -448,7 +448,7 @@ dnl - Writing `$ 0' prevents expansion by both the shell 
and m4 here.
 dnl
 dnl m4-double-quote most of the scripting for readability.
 [cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
-cat >>"\$tmp/subs1.awk" <<\\_ACAWK &&
+cat >>"\$ac_tmp/subs1.awk" <<\\_ACAWK &&
 _ACEOF
 sed -n '
 h
@@ -496,7 +496,7 @@ t delim
 rm -f conf$$subs.awk
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 _ACAWK
-cat >>"\$tmp/subs1.awk" <<_ACAWK &&
+cat >>"\$ac_tmp/subs1.awk" <<_ACAWK &&
   for (key in S) S_is_set[key] = 1
   FS = ""
 ]m4_ifdef([_AC_SUBST_FILES],
@@ -548,7 +548,7 @@ if sed "s/$ac_cr//" < /dev/null > /dev/null 2>&1; then
   sed "s/$ac_cr\$//; s/$ac_cr/$ac_cs_awk_cr/g"
 else
   cat
-fi < "$tmp/subs1.awk" > "$tmp/subs.awk" \
+fi < "$ac_tmp/subs1.awk" > "$ac_tmp/subs.awk" \
   || AC_MSG_ERROR([could not setup config files machinery])
 _ACEOF
 
@@ -673,28 +673,29 @@ m4_map_args_sep([$0_ADJUST_DIR(], [)], [
 m4_ifndef([AC_DATAROOTDIR_CHECKED], [$ac_datarootdir_hack
 ])dnl
 "
-eval sed \"\$ac_sed_extra\" "$ac_file_inputs" m4_defn([_AC_SUBST_CMDS]) 
>$tmp/out \
-  || AC_MSG_ERROR([could not create $ac_file])
+eval sed \"\$ac_sed_extra\" "$ac_file_inputs" m4_defn([_AC_SUBST_CMDS]) \
+  >$ac_tmp/out || AC_MSG_ERROR([could not create $ac_file])
 
 m4_ifndef([AC_DATAROOTDIR_CHECKED],
 [test -z "$ac_datarootdir_hack$ac_datarootdir_seen" &&
-  { ac_out=`sed -n '/\${datarootdir}/p' "$tmp/out"`; test -n "$ac_out"; } &&
-  { ac_out=`sed -n '/^[[        ]]*datarootdir[[        ]]*:*=/p' "$tmp/out"`; 
test -z "$ac_out"; } &&
+  { ac_out=`sed -n '/\${datarootdir}/p' "$ac_tmp/out"`; test -n "$ac_out"; } &&
+  { ac_out=`sed -n '/^[[        ]]*datarootdir[[        ]]*:*=/p' \
+      "$ac_tmp/out"`; test -z "$ac_out"; } &&
   AC_MSG_WARN([$ac_file contains a reference to the variable `datarootdir'
 which seems to be undefined.  Please make sure it is defined])
 ])dnl
 
-  rm -f "$tmp/stdin"
+  rm -f "$ac_tmp/stdin"
   case $ac_file in
-  -) cat "$tmp/out" && rm -f "$tmp/out";;
-  *) rm -f "$ac_file" && mv "$tmp/out" "$ac_file";;
+  -) cat "$ac_tmp/out" && rm -f "$ac_tmp/out";;
+  *) rm -f "$ac_file" && mv "$ac_tmp/out" "$ac_file";;
   esac \
   || AC_MSG_ERROR([could not create $ac_file])
 dnl This would break Makefile dependencies:
-dnl  if diff "$ac_file" "$tmp/out" >/dev/null 2>&1; then
+dnl  if diff "$ac_file" "$ac_tmp/out" >/dev/null 2>&1; then
 dnl    echo "$ac_file is unchanged"
 dnl  else
-dnl     rm -f "$ac_file"; mv "$tmp/out" "$ac_file"
+dnl     rm -f "$ac_file"; mv "$ac_tmp/out" "$ac_file"
 dnl  fi
 ])# _AC_OUTPUT_FILE
 
@@ -736,7 +737,7 @@ m4_define([_AC_OUTPUT_HEADERS_PREPARE],
 # This happens for instance with `./config.status Makefile'.
 if test -n "$CONFIG_HEADERS"; then
 dnl This `||' list is finished at the end of _AC_OUTPUT_HEADERS_PREPARE.
-cat >"$tmp/defines.awk" <<\_ACAWK ||
+cat >"$ac_tmp/defines.awk" <<\_ACAWK ||
 BEGIN {
 _ACEOF
 
@@ -883,19 +884,19 @@ m4_define([_AC_OUTPUT_HEADER],
   if test x"$ac_file" != x-; then
     {
       AS_ECHO(["/* $configure_input  */"]) \
-      && eval '$AWK -f "$tmp/defines.awk"' "$ac_file_inputs"
-    } >"$tmp/config.h" \
+      && eval '$AWK -f "$ac_tmp/defines.awk"' "$ac_file_inputs"
+    } >"$ac_tmp/config.h" \
       || AC_MSG_ERROR([could not create $ac_file])
-    if diff "$ac_file" "$tmp/config.h" >/dev/null 2>&1; then
+    if diff "$ac_file" "$ac_tmp/config.h" >/dev/null 2>&1; then
       AC_MSG_NOTICE([$ac_file is unchanged])
     else
       rm -f "$ac_file"
-      mv "$tmp/config.h" "$ac_file" \
+      mv "$ac_tmp/config.h" "$ac_file" \
        || AC_MSG_ERROR([could not create $ac_file])
     fi
   else
     AS_ECHO(["/* $configure_input  */"]) \
-      && eval '$AWK -f "$tmp/defines.awk"' "$ac_file_inputs" \
+      && eval '$AWK -f "$ac_tmp/defines.awk"' "$ac_file_inputs" \
       || AC_MSG_ERROR([could not create -])
   fi
 dnl If running for Automake, be ready to perform additional
@@ -1624,16 +1625,21 @@ fi
 # Hook for its removal unless debugging.
 # Note that there is a small window in which the directory will not be cleaned:
 # after its creation but before its name has been assigned to `$tmp'.
+dnl For historical reasons, AS_TMPDIR must continue to place the results
+dnl in $tmp; but we swap to the namespace-clean $ac_tmp to avoid issues
+dnl with any CONFIG_COMMANDS playing with the common variable name $tmp.
 $debug ||
 {
-  tmp=
+  tmp= ac_tmp=
   trap 'exit_status=$?
-  { test -z "$tmp" || test ! -d "$tmp" || rm -fr "$tmp"; } && exit $exit_status
+  : "${ac_tmp:=$tmp}"
+  { test ! -d "$ac_tmp" || rm -fr "$ac_tmp"; } && exit $exit_status
 ' 0
   trap 'AS_EXIT([1])' 1 2 13 15
 }
 dnl The comment above AS_TMPDIR says at most 4 chars are allowed.
 AS_TMPDIR([conf], [.])
+ac_tmp=$tmp
 
 m4_ifdef([_AC_SEEN_CONFIG(FILES)], [_AC_OUTPUT_FILES_PREPARE])[]dnl
 m4_ifdef([_AC_SEEN_CONFIG(HEADERS)], [_AC_OUTPUT_HEADERS_PREPARE])[]dnl
@@ -1671,7 +1677,7 @@ do
     for ac_f
     do
       case $ac_f in
-      -) ac_f="$tmp/stdin";;
+      -) ac_f="$ac_tmp/stdin";;
       *) # Look for the file first in the build tree, then in the source tree
         # (if the path is not absolute).  The absolute path cannot be 
DOS-style,
         # because $ac_f cannot contain `:'.
@@ -1705,7 +1711,7 @@ do
     esac
 
     case $ac_tag in
-    *:-:* | *:-) cat >"$tmp/stdin" \
+    *:-:* | *:-) cat >"$ac_tmp/stdin" \
       || AC_MSG_ERROR([could not create $ac_file]) ;;
     esac
     ;;
diff --git a/tests/torture.at b/tests/torture.at
index 6855da4..e395fc1 100644
--- a/tests/torture.at
+++ b/tests/torture.at
@@ -29,6 +29,34 @@ AT_CHECK_MACRO([AC_CONFIG_COMMANDS with empty commands],
 ]])
 
 
+## --------------------------------------------- ##
+## AC_CONFIG_COMMANDS with temporary directory.  ##
+## --------------------------------------------- ##
+
+AT_CHECK_MACRO([AC_CONFIG_COMMANDS with temporary directory],
+[[AC_CONFIG_COMMANDS([foo], [
+case $ACTION in
+  use)
+    echo "$tmp" > tmpdir
+    test -d "$tmp" || AC_MSG_ERROR([No $tmp directory])
+    echo garbage-in > "$tmp/garbage-out"
+    ;;
+  corrupt)
+    echo "$tmp" > tmpdir
+    tmp=/nosuch
+    ;;
+  *) ;;
+esac
+])
+]], [
+AT_CHECK([test ! -f tmpdir])
+AT_CHECK([ACTION=use ./config.status], [], [ignore])
+AT_CHECK([test -s tmpdir && test ! -d "`cat tmpdir`"])
+AT_CHECK([ACTION=corrupt ./config.status], [], [ignore])
+AT_CHECK([test -s tmpdir && test ! -d "`cat tmpdir`"])
+])
+
+
 ## -------------------------- ##
 ## Multiple AC_CONFIG_FILES.  ##
 ## -------------------------- ##


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-- 
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