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#   Copyright (C) 1997, 1999, 2000, 2003, 2004, 2005, 2006, 2007, 2008, 2009,

#   2010 Free Software Foundation, Inc.

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 3 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with GCC; see the file COPYING3.  If not see

# .

load_lib dg.exp

load_lib file-format.exp

load_lib target-supports.exp

load_lib target-supports-dg.exp

load_lib scanasm.exp

load_lib scanrtl.exp

load_lib scantree.exp

load_lib scanipa.exp

load_lib timeout.exp

load_lib timeout-dg.exp

load_lib prune.exp

load_lib libgloss.exp

load_lib target-libpath.exp

load_lib torture-options.exp

# We set LC_ALL and LANG to C so that we get the same error messages as expected.

setenv LC_ALL C

setenv LANG C

# Many hosts now default to a non-ASCII C locale, however, so

# they can set a charset encoding here if they need.

if { [ishost "*-*-cygwin*"] } {

  setenv LC_ALL C.ASCII

  setenv LANG C.ASCII

}

global GCC_UNDER_TEST

if ![info exists GCC_UNDER_TEST] {

    set GCC_UNDER_TEST "[find_gcc]"

}

if [info exists TORTURE_OPTIONS] {

    set DG_TORTURE_OPTIONS $TORTURE_OPTIONS

} else {

    # It is theoretically beneficial to group all of the O2/O3 options together,

    # as in many cases the compiler will generate identical executables for

    # all of them--and the c-torture testsuite will skip testing identical

    # executables multiple times.

    # Also note that -finline-functions is explicitly included in one of the

    # items below, even though -O3 is also specified, because some ports may

    # choose to disable inlining functions by default, even when optimizing.

    set DG_TORTURE_OPTIONS [list \

        { -O0 } \

        { -O1 } \

        { -O2 } \

        { -O3 -fomit-frame-pointer } \

        { -O3 -fomit-frame-pointer -funroll-loops } \

        { -O3 -fomit-frame-pointer -funroll-all-loops -finline-functions } \

        { -O3 -g } \

        { -Os } ]

}

if [info exists ADDITIONAL_TORTURE_OPTIONS] {

    set DG_TORTURE_OPTIONS \

        [concat $DG_TORTURE_OPTIONS $ADDITIONAL_TORTURE_OPTIONS]

}

set LTO_TORTURE_OPTIONS ""

# Some torture-options cause intermediate code output, unusable for

# testing using e.g. scan-assembler.  In this variable are the options

# how to force it, when needed.

global gcc_force_conventional_output

set gcc_force_conventional_output ""

if [check_effective_target_lto] {

    # When having plugin test both slim and fat LTO and plugin/nonplugin

    # path.

    if [check_linker_plugin_available] {

      set LTO_TORTURE_OPTIONS [list \

          { -O2 -flto -fno-use-linker-plugin -flto-partition=none } \

          { -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects }

      ]

      set gcc_force_conventional_output "-ffat-lto-objects"

    } else {

      set LTO_TORTURE_OPTIONS [list \

          { -O2 -flto -flto-partition=none } \

          { -O2 -flto }

      ]

    }

}

global orig_environment_saved

# This file may be sourced, so don't override environment settings

# that have been previously setup.

if { $orig_environment_saved == 0 } {

    append ld_library_path [gcc-set-multilib-library-path $GCC_UNDER_TEST]

    set_ld_library_path_env_vars

}

# Define gcc callbacks for dg.exp.

proc gcc-dg-test-1 { target_compile prog do_what extra_tool_flags } {

    # Set up the compiler flags, based on what we're going to do.

    set options [list]

    # Tests should be able to use "dg-do repo".  However, the dg test

    # driver checks the argument to dg-do against a list of acceptable

    # options, and "repo" is not among them.  Therefore, we resort to

    # this ugly approach.

    if [string match "*-frepo*" $extra_tool_flags] then {

        set do_what "repo"

    }

    switch $do_what {

        "preprocess" {

            set compile_type "preprocess"

            set output_file "[file rootname [file tail $prog]].i"

        }

        "compile" {

            set compile_type "assembly"

            set output_file "[file rootname [file tail $prog]].s"

        }

        "assemble" {

            set compile_type "object"

            set output_file "[file rootname [file tail $prog]].o"

        }

        "precompile" {

            set compile_type "precompiled_header"

            set output_file "[file tail $prog].gch"

        }

        "link" {

            set compile_type "executable"

            set output_file "[file rootname [file tail $prog]].exe"

            # The following line is needed for targets like the i960 where

            # the default output file is b.out.  Sigh.

        }

        "repo" {

            set compile_type "object"

            set output_file "[file rootname [file tail $prog]].o"

        }

        "run" {

            set compile_type "executable"

            # FIXME: "./" is to cope with "." not being in $PATH.

            # Should this be handled elsewhere?

            # YES.

            set output_file "./[file rootname [file tail $prog]].exe"

            # This is the only place where we care if an executable was

            # created or not.  If it was, dg.exp will try to run it.

            catch { remote_file build delete $output_file }

        }

        default {

            perror "$do_what: not a valid dg-do keyword"

            return ""

        }

    }

    # Let { dg-final { action } } force options as returned by an

    # optional proc ${action}_required_options.

    upvar 2 dg-final-code finalcode

    foreach x [split $finalcode "\n"] {

        set finalcmd [lindex $x 0]

        if { [info procs ${finalcmd}_required_options] != "" } {

            set req [${finalcmd}_required_options]

            if { $req != "" } {

                lappend extra_tool_flags $req

            }

        }

    }

    if { $extra_tool_flags != "" } {

        lappend options "additional_flags=$extra_tool_flags"

    }

    set comp_output [$target_compile "$prog" "$output_file" "$compile_type" $options]

    # Look for an internal compiler error, which sometimes masks the fact

    # that we didn't get an expected error message.  XFAIL an ICE via

    # dg-xfail-if and use { dg-prune-output ".*internal compiler error.*" }

    # to avoid a second failure for excess errors.

    if [string match "*internal compiler error*" $comp_output] {

        upvar 2 name name

        fail "$name (internal compiler error)"

    }

    if { $do_what == "repo" } {

        set object_file "$output_file"

        set output_file "[file rootname [file tail $prog]].exe"

        set comp_output \

            [ concat $comp_output \

                  [$target_compile "$object_file" "$output_file" \

                       "executable" $options] ]

    }

    return [list $comp_output $output_file]

}

proc gcc-dg-test { prog do_what extra_tool_flags } {

    return [gcc-dg-test-1 gcc_target_compile $prog $do_what $extra_tool_flags]

}

proc gcc-dg-prune { system text } {

    global additional_prunes

    set text [prune_gcc_output $text]

    foreach p $additional_prunes {

        if { [string length $p] > 0 } {

            # Following regexp matches a complete line containing $p.

            regsub -all "(^|\n)\[^\n\]*$p\[^\n\]*" $text "" text

        }

    }

    # If we see "region xxx is full" then the testcase is too big for ram.

    # This is tricky to deal with in a large testsuite like c-torture so

    # deal with it here.  Just mark the testcase as unsupported.

    if [regexp "(^|\n)\[^\n\]*: region \[^\n\]* is full" $text] {

        # The format here is important.  See dg.exp.

        return "::unsupported::memory full"

    }

    # Likewise, if we see ".text exceeds local store range" or

    # similar.

    if {[string match "spu-*" $system] && \

            [string match "*exceeds local store*" $text]} {

        # The format here is important.  See dg.exp.

        return "::unsupported::memory full"

    }

    return $text

}

# Replace ${tool}_load with a wrapper to provide for an expected nonzero

# exit status.  Multiple languages include this file so this handles them

# all, not just gcc.

if { [info procs ${tool}_load] != [list] \

      && [info procs saved_${tool}_load] == [list] } {

    rename ${tool}_load saved_${tool}_load

    proc ${tool}_load { program args } {

        global tool

        global shouldfail

        set result [eval [list saved_${tool}_load $program] $args]

        if { $shouldfail != 0 } {

            switch [lindex $result 0] {

                "pass" { set status "fail" }

                "fail" { set status "pass" }

            }

            set result [list $status [lindex $result 1]]

        }

        return $result

    }

}

# Utility routines.

#

# search_for -- looks for a string match in a file

#

proc search_for { file pattern } {

    set fd [open $file r]

    while { [gets $fd cur_line]>=0 } {

        if [string match "*$pattern*" $cur_line] then {

            close $fd

            return 1

        }

    }

    close $fd

    return 0

}

# Modified dg-runtest that can cycle through a list of optimization options

# as c-torture does.

proc gcc-dg-runtest { testcases default-extra-flags } {

    global runtests

    # Some callers set torture options themselves; don't override those.

    set existing_torture_options [torture-options-exist]

    if { $existing_torture_options == 0 } {

        global DG_TORTURE_OPTIONS LTO_TORTURE_OPTIONS

        torture-init

        set-torture-options $DG_TORTURE_OPTIONS [list {}] $LTO_TORTURE_OPTIONS

    }

    dump-torture-options

    foreach test $testcases {

        global torture_with_loops torture_without_loops

        # If we're only testing specific files and this isn't one of

        # them, skip it.

        if ![runtest_file_p $runtests $test] {

            continue

        }

        # Look for a loop within the source code - if we don't find one,

        # don't pass -funroll[-all]-loops.

        if [expr [search_for $test "for*("]+[search_for $test "while*("]] {

            set option_list $torture_with_loops

        } else {

            set option_list $torture_without_loops

        }

        set nshort [file tail [file dirname $test]]/[file tail $test]

        foreach flags $option_list {

            verbose "Testing $nshort, $flags" 1

            dg-test $test $flags ${default-extra-flags}

        }

    }

    if { $existing_torture_options == 0 } {

        torture-finish

    }

}

proc gcc-dg-debug-runtest { target_compile trivial opt_opts testcases } {

    global srcdir subdir

    if ![info exists DEBUG_TORTURE_OPTIONS] {

        set DEBUG_TORTURE_OPTIONS ""

        foreach type {-gdwarf-2 -gstabs -gstabs+ -gxcoff -gxcoff+ -gcoff} {

            set comp_output [$target_compile \

                    "$srcdir/$subdir/$trivial" "trivial.S" assembly \

                    "additional_flags=$type"]

            if { ! [string match "*: target system does not support the * debug format*" \

                    $comp_output] } {

                remove-build-file "trivial.S"

                foreach level {1 "" 3} {

                    if { ($type == "-gdwarf-2") && ($level != "") } {

                        lappend DEBUG_TORTURE_OPTIONS [list "${type}" "-g${level}"]

                        foreach opt $opt_opts {

                            lappend DEBUG_TORTURE_OPTIONS \

                                    [list "${type}" "-g${level}" "$opt" ]

                        }

                    } else {

                        lappend DEBUG_TORTURE_OPTIONS [list "${type}${level}"]

                        foreach opt $opt_opts {

                            lappend DEBUG_TORTURE_OPTIONS \

                                    [list "${type}${level}" "$opt" ]

                        }

                    }

                }

            }

        }

    }

    verbose -log "Using options $DEBUG_TORTURE_OPTIONS"

    global runtests

    foreach test $testcases {

        # If we're only testing specific files and this isn't one of

        # them, skip it.

        if ![runtest_file_p $runtests $test] {

            continue

        }

        set nshort [file tail [file dirname $test]]/[file tail $test]

        foreach flags $DEBUG_TORTURE_OPTIONS {

            set doit 1

            # These tests check for information which may be deliberately

            # suppressed at -g1.

            if { ([string match {*/debug-[126].c} "$nshort"] \

                   || [string match {*/enum-1.c} "$nshort"] \

                   || [string match {*/enum-[12].C} "$nshort"]) \

                    && ([string match "*1" [lindex "$flags" 0] ]

                        || [lindex "$flags" 1] == "-g1") } {

                set doit 0

            }

    # High optimization can remove the variable whose existence is tested.

    # Dwarf debugging with commentary (-dA) preserves the symbol name in the

    # assembler output, but stabs debugging does not.

    # http://gcc.gnu.org/ml/gcc-regression/2003-04/msg00095.html

            if { [string match {*/debug-[12].c} "$nshort"] \

                    && [string match "*O*" "$flags"] \

                    && ( [string match "*coff*" "$flags"] \

                         || [string match "*stabs*" "$flags"] ) } {

                set doit 0

            }

            if { $doit } {

                verbose -log "Testing $nshort, $flags" 1

                dg-test $test $flags ""

            }

        }

    }

}

# Prune any messages matching ARGS[1] (a regexp) from test output.

proc dg-prune-output { args } {

    global additional_prunes

    if { [llength $args] != 2 } {

        error "[lindex $args 1]: need one argument"

        return

    }

    lappend additional_prunes [lindex $args 1]

}

# Remove files matching the pattern from the build machine.

proc remove-build-file { pat } {

    verbose "remove-build-file `$pat'" 2

    set file_list "[glob -nocomplain $pat]"

    verbose "remove-build-file `$file_list'" 2

    foreach output_file $file_list {

        if [is_remote host] {

            # Ensure the host knows the file is gone by deleting there

            # first.

            remote_file host delete $output_file

        }

        remote_file build delete $output_file

    }

}

# Remove runtime-generated profile file for the current test.

proc cleanup-profile-file { } {

    remove-build-file "mon.out"

    remove-build-file "gmon.out"

}

# Remove compiler-generated coverage files for the current test.

proc cleanup-coverage-files { } {

    # This assumes that we are two frames down from dg-test or some other proc

    # that stores the filename of the testcase in a local variable "name".

    # A cleaner solution would require a new DejaGnu release.

    upvar 2 name testcase

    # The name might include a list of options; extract the file name.

    set testcase [lindex $testcase 0]

    remove-build-file "[file rootname [file tail $testcase]].gc??"

    # Clean up coverage files for additional source files.

    if [info exists additional_sources] {

        foreach srcfile $additional_sources {

            remove-build-file "[file rootname [file tail $srcfile]].gc??"

        }

    }

}

# Remove compiler-generated files from -repo for the current test.

proc cleanup-repo-files { } {

    # This assumes that we are two frames down from dg-test or some other proc

    # that stores the filename of the testcase in a local variable "name".

    # A cleaner solution would require a new DejaGnu release.

    upvar 2 name testcase

    # The name might include a list of options; extract the file name.

    set testcase [lindex $testcase 0]

    remove-build-file "[file rootname [file tail $testcase]].o"

    remove-build-file "[file rootname [file tail $testcase]].rpo"

    # Clean up files for additional source files.

    if [info exists additional_sources] {

        foreach srcfile $additional_sources {

            remove-build-file "[file rootname [file tail $srcfile]].o"

            remove-build-file "[file rootname [file tail $srcfile]].rpo"

        }

    }

}

# Remove compiler-generated RTL dump files for the current test.

#

# SUFFIX is the filename suffix pattern.

proc cleanup-rtl-dump { suffix } {

  cleanup-dump "\[0-9\]\[0-9\]\[0-9\]r.$suffix"

}

# Remove a specific tree dump file for the current test.

#

# SUFFIX is the tree dump file suffix pattern.

proc cleanup-tree-dump { suffix } {

  cleanup-dump "\[0-9\]\[0-9\]\[0-9\]t.$suffix"

}

# Remove a specific ipa dump file for the current test.

#

# SUFFIX is the ipa dump file suffix pattern.

proc cleanup-ipa-dump { suffix } {

  cleanup-dump "\[0-9\]\[0-9\]\[0-9\]i.$suffix"

}

# Remove a stack usage file for the current test.

proc cleanup-stack-usage { } {

    # This assumes that we are two frames down from dg-test or some other proc

    # that stores the filename of the testcase in a local variable "name".

    # A cleaner solution would require a new DejaGnu release.

    upvar 2 name testcase

    # The name might include a list of options; extract the file name.

    set testcase [lindex $testcase 0]

    remove-build-file "[file rootname [file tail $testcase]].su"

    # Clean up files for additional source files.

    if [info exists additional_sources] {

        foreach srcfile $additional_sources {

            remove-build-file "[file rootname [file tail $srcfile]].su"

        }

    }

}

# Remove all dump files with the provided suffix.

proc cleanup-dump { suffix } {

    # This assumes that we are three frames down from dg-test or some other

    # proc that stores the filename of the testcase in a local variable

    # "name".  A cleaner solution would require a new DejaGnu release.

    upvar 3 name testcase

    # The name might include a list of options; extract the file name.

    set src [file tail [lindex $testcase 0]]

    remove-build-file "[file tail $src].$suffix"

    remove-build-file "[file rootname [file tail $src]].exe.$suffix"

    remove-build-file "[file rootname [file tail $src]].exe.ltrans\[0-9\]*.$suffix"

    # -fcompare-debug dumps

    remove-build-file "[file tail $src].gk.$suffix"

    # Clean up dump files for additional source files.

    if [info exists additional_sources] {

        foreach srcfile $additional_sources {

            remove-build-file "[file tail $srcfile].$suffix"

            remove-build-file "[file rootname [file tail $srcfile]].exe.$suffix"

            remove-build-file "[file rootname [file tail $srcfile]].exe.ltrans\[0-9\]*.$suffix"

            # -fcompare-debug dumps

            remove-build-file "[file tail $srcfile].gk.$suffix"

        }

    }

}

# Remove files kept by --save-temps for the current test.

#

# Currently this is only .i, .ii, .s and .o files, but more can be added

# if there are tests generating them.

# ARGS is a list of suffixes to NOT delete.

proc cleanup-saved-temps { args } {

    global additional_sources

    set suffixes {}

    # add the to-be-kept suffixes

    foreach suffix {".ii" ".i" ".s" ".o" ".gkd"} {

        if {[lsearch $args $suffix] < 0} {

            lappend suffixes $suffix

        }

    }

    # This assumes that we are two frames down from dg-test or some other proc

    # that stores the filename of the testcase in a local variable "name".

    # A cleaner solution would require a new DejaGnu release.

    upvar 2 name testcase

    # The name might include a list of options; extract the file name.

    set testcase [lindex $testcase 0]

    foreach suffix $suffixes {

        remove-build-file "[file rootname [file tail $testcase]]$suffix"

        # -fcompare-debug dumps

        remove-build-file "[file rootname [file tail $testcase]].gk$suffix"

    }

    # Clean up saved temp files for additional source files.

    if [info exists additional_sources] {

        foreach srcfile $additional_sources {

            foreach suffix $suffixes {

                remove-build-file "[file rootname [file tail $srcfile]]$suffix"

                # -fcompare-debug dumps

                remove-build-file "[file rootname [file tail $srcfile]].gk$suffix"

            }

        }

    }

}

# Remove files for specified Fortran modules.

proc cleanup-modules { modlist } {

    foreach modname $modlist {

        remove-build-file [string tolower $modname].mod

    }

}

# Scan Fortran modules for a given regexp.

#

# Argument 0 is the module name

# Argument 1 is the regexp to match

proc scan-module { args } {

    set modfilename [string tolower [lindex $args 0]].mod

    set fd [open $modfilename r]

    set text [read $fd]

    close $fd

    upvar 2 name testcase

    if [regexp -- [lindex $args 1] $text] {

      pass "$testcase scan-module [lindex $args 1]"

    } else {

      fail "$testcase scan-module [lindex $args 1]"

    }

}

# Scan Fortran modules for absence of a given regexp.

#

# Argument 0 is the module name

# Argument 1 is the regexp to match

proc scan-module-absence { args } {

    set modfilename [string tolower [lindex $args 0]].mod

    set fd [open $modfilename r]

    set text [read $fd]

    close $fd

    upvar 2 name testcase

    if [regexp -- [lindex $args 1] $text] {

      fail "$testcase scan-module [lindex $args 1]"

    } else {

      pass "$testcase scan-module [lindex $args 1]"

    }

}

# Verify that the compiler output file exists, invoked via dg-final.

proc output-exists { args } {

    # Process an optional target or xfail list.

    if { [llength $args] >= 1 } {

        switch [dg-process-target [lindex $args 0]] {

            "S" { }

            "N" { return }

            "F" { setup_xfail "*-*-*" }

            "P" { }

        }

    }

    # Access variables from gcc-dg-test-1.

    upvar 2 name testcase

    upvar 2 output_file output_file

    if [file exists $output_file] {

        pass "$testcase output-exists $output_file"

    } else {

        fail "$testcase output-exists $output_file"

    }

}

# Verify that the compiler output file does not exist, invoked via dg-final.

proc output-exists-not { args } {

    # Process an optional target or xfail list.

    if { [llength $args] >= 1 } {

        switch [dg-process-target [lindex $args 0]] {

            "S" { }

            "N" { return }

            "F" { setup_xfail "*-*-*" }

            "P" { }

        }

    }

    # Access variables from gcc-dg-test-1.

    upvar 2 name testcase

    upvar 2 output_file output_file

    if [file exists $output_file] {

        fail "$testcase output-exists-not $output_file"

    } else {

        pass "$testcase output-exists-not $output_file"

    }

}

# We need to make sure that additional_* are cleared out after every

# test.  It is not enough to clear them out *before* the next test run

# because gcc-target-compile gets run directly from some .exp files

# (outside of any test).  (Those uses should eventually be eliminated.)

# Because the DG framework doesn't provide a hook that is run at the

# end of a test, we must replace dg-test with a wrapper.

if { [info procs saved-dg-test] == [list] } {

    rename dg-test saved-dg-test

    proc dg-test { args } {

        global additional_files

        global additional_sources

        global additional_prunes

        global errorInfo

        global compiler_conditional_xfail_data

        global shouldfail

        if { [ catch { eval saved-dg-test $args } errmsg ] } {

            set saved_info $errorInfo

            set additional_files ""

            set additional_sources ""

            set additional_prunes ""

            set shouldfail 0

            if [info exists compiler_conditional_xfail_data] {

                unset compiler_conditional_xfail_data

            }

            unset_timeout_vars

            error $errmsg $saved_info

        }

        set additional_files ""

        set additional_sources ""

        set additional_prunes ""

        set shouldfail 0

        unset_timeout_vars

        if [info exists compiler_conditional_xfail_data] {

            unset compiler_conditional_xfail_data

        }

    }

}

if { [info procs saved-dg-warning] == [list] \

     && [info exists gcc_warning_prefix] } {

    rename dg-warning saved-dg-warning

    proc dg-warning { args } {

        # Make this variable available here and to the saved proc.

        upvar dg-messages dg-messages

        global gcc_warning_prefix

        process-message saved-dg-warning "$gcc_warning_prefix" "$args"

    }

}

if { [info procs saved-dg-error] == [list] \

     && [info exists gcc_error_prefix] } {

    rename dg-error saved-dg-error

    proc dg-error { args } {

        # Make this variable available here and to the saved proc.

        upvar dg-messages dg-messages

        global gcc_error_prefix

        process-message saved-dg-error "$gcc_error_prefix" "$args"

    }

    # Override dg-bogus at the same time.  It doesn't handle a prefix

    # but its expression should include a column number.  Otherwise the

    # line number can match the column number for other messages, leading

    # to insanity.

    rename dg-bogus saved-dg-bogus

    proc dg-bogus { args } {

        upvar dg-messages dg-messages

        process-message saved-dg-bogus "" $args

    }

}

# Modify the regular expression saved by a DejaGnu message directive to

# include a prefix and to force the expression to match a single line.

# MSGPROC is the procedure to call.

# MSGPREFIX is the prefix to prepend.

# DGARGS is the original argument list.

proc process-message { msgproc msgprefix dgargs } {

    upvar dg-messages dg-messages

    # Process the dg- directive, including adding the regular expression

    # to the new message entry in dg-messages.

    set msgcnt [llength ${dg-messages}]

    catch { eval $msgproc $dgargs }

    # If the target expression wasn't satisfied there is no new message.

    if { [llength ${dg-messages}] == $msgcnt } {

        return;

    }

    # Get the entry for the new message.  Prepend the message prefix to

    # the regular expression and make it match a single line.

    set newentry [lindex ${dg-messages} end]

    set expmsg [lindex $newentry 2]

    # Handle column numbers from the specified expression (if there is

    # one) and set up the search expression that will be used by DejaGnu.

    if [regexp "^(\[0-9\]+):" $expmsg "" column] {

        # The expression in the directive included a column number.

        # Remove "COLUMN:" from the original expression and move it

        # to the proper place in the search expression.

        regsub "^\[0-9\]+:" $expmsg "" expmsg

        set expmsg "$column: $msgprefix\[^\n\]*$expmsg"

    } elseif [string match "" [lindex $newentry 0]] {

        # The specified line number is 0; don't expect a column number.

        set expmsg "$msgprefix\[^\n\]*$expmsg"

    } else {

        # There is no column number in the search expression, but we

        # should expect one in the message itself.

        set expmsg "\[0-9\]+: $msgprefix\[^\n\]*$expmsg"

    }

    set newentry [lreplace $newentry 2 2 $expmsg]

    set dg-messages [lreplace ${dg-messages} end end $newentry]

    verbose "process-message:\n${dg-messages}" 2

}

# Look for messages that don't have standard prefixes.

proc dg-message { args } {

    upvar dg-messages dg-messages

    process-message saved-dg-warning "" $args

}

# Check the existence of a gdb in the path, and return true if there

# is one.

#

# Set env(GDB_FOR_GCC_TESTING) accordingly.

proc gdb-exists { args } {

    if ![info exists ::env(GDB_FOR_GCC_TESTING)] {

        global GDB

        if ![info exists ::env(GDB_FOR_GCC_TESTING)] {

            if [info exists GDB] {

                setenv GDB_FOR_GCC_TESTING "$GDB"

            } else {

                setenv GDB_FOR_GCC_TESTING "[transform gdb]"

            }

        }

    }

    if { [which $::env(GDB_FOR_GCC_TESTING)] != 0 } {

        return 1;

    }

    return 0;

}

set additional_prunes ""