path: root/gcc/testsuite/lib/gcc-dg.exp

#   Copyright (C) 1997-2013 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
# <http://www.gnu.org/licenses/>.

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
load_lib fortran-modules.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

    # Extra prune rules that will apply to tests defined in a .exp file.
    # Always remember to clear it in .exp file after executed all tests.
    global dg_runtest_extra_prunes

    set text [prune_gcc_output $text]

    foreach p "$additional_prunes $dg_runtest_extra_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
	global set_target_env_var

	set saved_target_env_var [list]
	if { [info exists set_target_env_var] \
	     && [llength $set_target_env_var] != 0 } {
	    if { [is_remote target] } {
		return [list "unsupported" ""]
	    }
	    set-target-env-var
	}
	set result [eval [list saved_${tool}_load $program] $args]
	if { [info exists set_target_env_var] \
	     && [llength $set_target_env_var] != 0 } {
	    restore-target-env-var
	}
	if { $shouldfail != 0 } {
	    switch [lindex $result 0] {
		"pass" { set status "fail" }
		"fail" { set status "pass" }
	    }
	    set result [list $status [lindex $result 1]]
	}
	return $result
    }
}

proc dg-set-target-env-var { args } {
    global set_target_env_var
    if { [llength $args] != 3 } {
	error "dg-set-target-env-var: need two arguments"
	return
    }
    lappend set_target_env_var [list [lindex $args 1] [lindex $args 2]]
}

proc set-target-env-var { } {
    global set_target_env_var
    upvar 1 saved_target_env_var saved_target_env_var
    foreach env_var $set_target_env_var {
	set var [lindex $env_var 0]
	set value [lindex $env_var 1]
	if [info exists env($var)] {
	    lappend saved_target_env_var [list $var 1 $env($var)]
	} else {
	    lappend saved_target_env_var [list $var 0]
	}
	setenv $var $value
    }
}

proc restore-target-env-var { } {
    upvar 1 saved_target_env_var saved_target_env_var
    for { set env_vari [llength $saved_target_env_var] } {
          [incr env_vari -1] >= 0 } {} {
	set env_var [lindex $saved_target_env_var $env_vari]
	set var [lindex $env_var 0]
	if [lindex $env_var 1] {
	    setenv $var [lindex $env_var 2]
	} else {
	    unsetenv $var
	}
    }
}

# 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 { } {
    set testcase [testname-for-summary]
    # 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 { } {
    set testcase [testname-for-summary]
    # 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 { } {
    set testcase [testname-for-summary]
    # 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 an Ada spec file for the current test.
proc cleanup-ada-spec { } {
    set testcase [testname-for-summary]
    remove-build-file "[get_ada_spec_filename $testcase]"

    # Clean up files for additional source files.
    if [info exists additional_sources] {
	foreach srcfile $additional_sources {
	    remove-build-file "[get_ada_spec_filename $srcfile]"
	}
    }
}

# Remove all dump files with the provided suffix.
proc cleanup-dump { suffix } {
    set testcase [testname-for-summary]
    # 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 {".mii" ".ii" ".i" ".s" ".o" ".gkd"} {
	if {[lsearch $args $suffix] < 0} {
	    lappend suffixes $suffix
	}
    }

    set testcase [testname-for-summary]
    # 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"
	    }
	}
    }
}

# 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 [list | gzip -dc $modfilename] r]
    set text [read $fd]
    close $fd

    set testcase [testname-for-summary]
    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

    set testcase [testname-for-summary]
    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" { }
	}
    }

    set testcase [testname-for-summary]
    # Access variable from gcc-dg-test-1.
    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" { }
	}
    }

    set testcase [testname-for-summary]
    # Access variable from gcc-dg-test-1.
    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
	global testname_with_flags
	global set_target_env_var

	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
	    }
	    if [info exists testname_with_flags] {
		unset testname_with_flags
	    }
	    unset_timeout_vars
	    error $errmsg $saved_info
	}
	set additional_files ""
	set additional_sources ""
	set additional_prunes ""
	set shouldfail 0
	if [info exists set_target_env_var] {
	    unset set_target_env_var
	}
	unset_timeout_vars
	if [info exists compiler_conditional_xfail_data] {
	    unset compiler_conditional_xfail_data
	}
	if [info exists testname_with_flags] {
	    unset testname_with_flags
	}
    }
}

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}]
    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 ""
set dg_runtest_extra_prunes ""