#
# default_ld_version 
#	extract and print the version number of ld
#
proc default_ld_version { ld } {
    global host_triplet

    if { [which $ld] == 0 } then {
	perror "$ld does not exist"
	exit 1
    }
    
    catch "exec $ld --version" tmp
    set tmp [prune_warnings $tmp]
    regexp "\[^\n\]* (cygnus-|)(\[-0-9.a-zA-Z-\]+)\[\r\n\].*" $tmp version cyg number
    if [info exists number] then {
	clone_output "$ld $number\n"
    }
}

#
# default_ld_relocate 
#	link an object using relocation
#
proc default_ld_relocate { ld target objects } {
    global HOSTING_EMU
    global host_triplet
    
    if { [which $ld] == 0 } then {
	perror "$ld does not exist"
	return 0
    }
    
    verbose -log "$ld $HOSTING_EMU -o $target -r $objects"
    
    catch "exec $ld $HOSTING_EMU -o $target -r $objects" exec_output
    set exec_output [prune_warnings $exec_output]
    if [string match "" $exec_output] then {
	return 1
    } else {
	verbose -log "$exec_output"
	return 0
    }
}

# Look for big-endian or little-endian switches in the multlib
# options and translate these into a -EB or -EL switch.  Note
# we cannot rely upon proc process_multilib_options to do this
# for us because for some targets the compiler does not support
# -EB/-EL but it does support -mbig-endian/-mlittle-endian, and
# the site.exp file will include the switch "-mbig-endian"
# (rather than "big-endian") which is not detected by proc
# process_multilib_options.

proc big_or_little_endian {} {
    
    if [board_info [target_info name] exists multilib_flags] {
	set tmp_flags " [board_info [target_info name] multilib_flags]";

	foreach x $tmp_flags {
	    case $x in {
		{*big*endian eb EB} {
		    set flags " -EB"
		    return $flags
		}
		{*little*endian el EL} {
		    set flags " -EL"
		    return $flags
		}
	    }
	}
    }

    set flags ""
    return $flags
}

#
# default_ld_link 
#	link a program using ld
#
proc default_ld_link { ld target objects } {
    global HOSTING_EMU
    global HOSTING_CRT0
    global HOSTING_LIBS
    global host_triplet
    
    set objs "$HOSTING_CRT0 $objects"
    set libs "$HOSTING_LIBS"
    
    if { [which $ld] == 0 } then {
	perror "$ld does not exist"
	return 0
    }
    
    set flags [big_or_little_endian]
    
    verbose -log "$ld $HOSTING_EMU $flags -o $target $objs $libs"
    
    catch "exec $ld $HOSTING_EMU $flags -o $target $objs $libs" exec_output
    set exec_output [prune_warnings $exec_output]
    if [string match "" $exec_output] then {
	return 1
    } else {
	verbose -log "$exec_output"
	return 0
    }
}

#
# default_ld_simple_link 
#	link a program using ld, without including any libraries
#
proc default_ld_simple_link { ld target objects } {
    global host_triplet
    
    if { [which $ld] == 0 } then {
	perror "$ld does not exist"
	return 0
    }
    
    set flags [big_or_little_endian]
    
    verbose -log "$ld $flags -o $target $objects"
    
    catch "exec $ld $flags -o $target $objects" exec_output
    set exec_output [prune_warnings $exec_output]

    # We don't care if we get a warning about a non-existent start
    # symbol, since the default linker script might use ENTRY.
    regsub -all "(^|\n)(\[^\n\]*: warning: cannot find entry symbol\[^\n\]*\n?)" $exec_output "\\1" exec_output

    if [string match "" $exec_output] then {
	return 1
    } else {
	verbose -log "$exec_output"
	return 0
    }
}

#
# default_ld_compile 
#	compile an object using cc
#
proc default_ld_compile { cc source object } {
    global CFLAGS
    global srcdir
    global subdir
    global host_triplet
    global gcc_gas_flag

    set cc_prog $cc
    if {[llength $cc_prog] > 1} then {
	set cc_prog [lindex $cc_prog 0]
    }
    if {[which $cc_prog] == 0} then {
	perror "$cc_prog does not exist"
	return 0
    }

    catch "exec rm -f $object" exec_output

    set flags "-I$srcdir/$subdir $CFLAGS"

    # If we are compiling with gcc, we want to add gcc_gas_flag to
    # flags.  Rather than determine this in some complex way, we guess
    # based on the name of the compiler.
    if {[string match "*gcc*" $cc] || [string match "*++*" $cc]} then {
	set flags "$gcc_gas_flag $flags"
    }

    if [board_info [target_info name] exists multilib_flags] {
	append flags " [board_info [target_info name] multilib_flags]";
    }

    verbose -log "$cc $flags -c $source -o $object"

    catch "exec $cc $flags -c $source -o $object" exec_output
    set exec_output [prune_warnings $exec_output]
    if [string match "" $exec_output] then {
	if {![file exists $object]} then {
	    regexp ".*/(\[^/\]*)$" $source all dobj
	    regsub "\\.c" $dobj ".o" realobj
	    verbose "looking for $realobj"
	    if {[file exists $realobj]} then {
		verbose -log "mv $realobj $object"
		catch "exec mv $realobj $object" exec_output
		set exec_output [prune_warnings $exec_output]
		if {![string match "" $exec_output]} then {
		    verbose -log "$exec_output"
		    perror "could not move $realobj to $object"
		    return 0
		}
	    } else {
		perror "$object not found after compilation"
		return 0
	    }
	}
	return 1
    } else {
	verbose -log "$exec_output"
	perror "$source: compilation failed"
	return 0
    }
}

#
# default_ld_assemble
#	assemble a file
#
proc default_ld_assemble { as source object } {
    global ASFLAGS
    global host_triplet
    
    if {[which $as] == 0} then {
	perror "$as does not exist"
	return 0
    }

    if ![info exists ASFLAGS] { set ASFLAGS "" }

    set flags [big_or_little_endian]

    verbose -log "$as $flags $ASFLAGS -o $object $source"

    catch "exec $as $flags $ASFLAGS -o $object $source" exec_output
    set exec_output [prune_warnings $exec_output]
    if [string match "" $exec_output] then {
	return 1
    } else {
	verbose -log "$exec_output"
	perror "$source: assembly failed"
	return 0
    }
}

#
# default_ld_nm
#	run nm on a file, putting the result in the array nm_output
#
proc default_ld_nm { nm object } {
    global NMFLAGS
    global nm_output
    global host_triplet

    if {[which $nm] == 0} then {
	perror "$nm does not exist"
	return 0
    }

    if {[info exists nm_output]} {
      unset nm_output
    }

    if ![info exists NMFLAGS] { set NMFLAGS "" }

    verbose -log "$nm $NMFLAGS $object >tmpdir/nm.out"

    catch "exec $nm $NMFLAGS $object >tmpdir/nm.out" exec_output
    set exec_output [prune_warnings $exec_output]
    if [string match "" $exec_output] then {
	set file [open tmpdir/nm.out r]
	while { [gets $file line] != -1 } {
	    verbose "$line" 2
	    if [regexp "^(\[0-9a-fA-F\]+) \[a-zA-Z0-9\] (.+)$" $line whole value name] {
                set name [string trimleft $name "_"]
		verbose "Setting nm_output($name) to 0x$value" 2
		set nm_output($name) 0x$value
	    }
	}
	close $file
	return 1
    } else {
	verbose -log "$exec_output"
	perror "$object: nm failed"
	return 0
    }
}

#
# simple_diff
#	compares two files line-by-line
#	returns differences if exist
#	returns null if file(s) cannot be opened
#
proc simple_diff { file_1 file_2 } {
    global target
	
    set eof -1
    set differences 0
    
    if [file exists $file_1] then {
	set file_a [open $file_1 r]
    } else {
	warning "$file_1 doesn't exist"
	return
    }
    
    if [file exists $file_2] then {
	set file_b [open $file_2 r]
    } else {
	fail "$file_2 doesn't exist"
	return
    }
    
    verbose "# Diff'ing: $file_1 $file_2\n" 2
    
    while { [gets $file_a line] != $eof } {
	if [regexp "^#.*$" $line] then {
	    continue
	} else {
	    lappend list_a $line
	}
    }
    close $file_a
    
    while { [gets $file_b line] != $eof } {
	if [regexp "^#.*$" $line] then {
	    continue
	} else {
	    lappend list_b $line
	}
    }
    close $file_b

    for { set i 0 } { $i < [llength $list_a] } { incr i } {
	set line_a [lindex $list_a $i]
	set line_b [lindex $list_b $i]

	verbose "\t$file_1: $i: $line_a\n" 3
	verbose "\t$file_2: $i: $line_b\n" 3
	if [string compare $line_a $line_b] then {
	    verbose -log "\t$file_1: $i: $line_a\n"
	    verbose -log "\t$file_2: $i: $line_b\n"

	    fail "Test: $target"
	    return
	}
    }
    
    if { [llength $list_a] != [llength $list_b] } {
	fail "Test: $target"
	return
    }

    if $differences<1 then {
	pass "Test: $target"
    }
}

# This definition is taken from an unreleased version of DejaGnu.  Once
# that version gets released, and has been out in the world for a few
# months at least, it may be safe to delete this copy.
if ![string length [info proc prune_warnings]] {
    #
    # prune_warnings -- delete various system verbosities from TEXT
    #
    # An example is:
    # ld.so: warning: /usr/lib/libc.so.1.8.1 has older revision than expected 9
    #
    # Sites with particular verbose os's may wish to override this in site.exp.
    #
    proc prune_warnings { text } {
	# This is from sun4's.  Do it for all machines for now.
	# The "\\1" is to try to preserve a "\n" but only if necessary.
	regsub -all "(^|\n)(ld.so: warning:\[^\n\]*\n?)+" $text "\\1" text

	# It might be tempting to get carried away and delete blank lines, etc.
	# Just delete *exactly* what we're ask to, and that's it.
	return $text
    }
}