# Expect script for ld-auto-import tests
#   Copyright 2002, 2007
#   Free Software Foundation, Inc.
#
# This file is part of the GNU Binutils.
#
# 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 this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
# MA 02110-1301, USA.
#
# Written by Ralf.Habacker@freenet.de
# Based on ls-shared/shared.exp by Ian Lance Taylor (ian@cygnus.com)
#
 
# Note: 
# 
# This test checks the "auto importing direct from a dll" functionality, 
# which dramatically reduces the linking time for big libraries and applications 
# by skipping creating/using import libraries. Instead it links directly to the 
# related dll or to a symlinked dll for replacing regular import libraries. 
# 
# The test has 4 stages: 
# 
# 1. compile and link a test dll exporting some text and data symbols and a 
#    standard import library
#
# 2. create a symbolic link to this dll to simulate a replaced import library. 
#
# 3. compile and link a client application with the standard import library. 
#    This should produce no errors. 
#
# 4. compile and link a client application with the created dll. 
#    This should also produce no errors. 
#
# 5. compile and link a client application using the "import library". 
#    This should also produce no errors. 
#
# 6. compile and link a client application with auto-import disabled. 
#    This should produce a linking error. 

# This test can only be run if ld generates native executables.
if ![isnative] then {return}

# This test can only be run on a couple of ELF platforms.
# Square bracket expressions seem to confuse istarget.
if { ![istarget *-pc-cygwin]    
     && ![istarget *-pc-mingw*] } {
    return
}

# No compiler, no test.
if { [which $CC] == 0 } {
    untested "Auto import test"
    return
}

# ld_special_link
#	link a program using ld, without including any libraries
#
proc ld_special_link { ld target objects } {
    global host_triplet
    global link_output

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

    if [is_endian_output_format $objects] then {
	set flags [big_or_little_endian]
    } else {
	set flags ""
    }

    verbose -log "$ld $flags -o $target $objects"

    catch "exec $ld $flags -o $target $objects" link_output
    set exec_output [prune_warnings $link_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

    # We don't care if we get a message about creating a library file.
    regsub -all "(^|\n)(Creating library file\[^\n\]*\n?)" $exec_output "\\1" exec_output

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

set tmpdir tmpdir
set SHCFLAG ""

if [istarget *-pc-cygwin] {
    # Set some libs needed for cygwin.
    set MYLIBS "-L/usr/lib -lcygwin -L/usr/lib/w32api -lkernel32"
    
    # Compile the dll.
    if ![ld_compile "$CC $CFLAGS $SHCFLAG" $srcdir/$subdir/dll.c $tmpdir/dll.o ] {
	fail "compiling shared lib"
    } elseif ![ld_special_link "$ld -shared --out-implib=$tmpdir/libstandard.dll.a" $tmpdir/dll.dll "$tmpdir/dll.o $MYLIBS" ] {
	fail "linking shared lib"
    } else {
	# Create symbolic link.
	catch "exec ln -fs dll.dll $tmpdir/libsymlinked_dll.dll.a" ln_catch
	
	# Compile and link the client program.
	if ![ld_compile "$CC $CFLAGS $SHCFLAG" $srcdir/$subdir/client.c $tmpdir/client.o ] {
	    fail "compiling client"
	} else {
	    # Check linking with import library.
	    set msg "linking auto-import client using a standard import library"
	    if [ld_special_link $ld $tmpdir/client.exe "--enable-auto-import /lib/crt0.o $tmpdir/client.o -L$tmpdir -lstandard $MYLIBS" ] {
		pass $msg
	    } else {
		fail $msg 
	    }

	    # Check linking directly with dll.
	    set msg "linking auto-import client using the dll"
	    if [ld_special_link $ld $tmpdir/client.exe "--enable-auto-import /lib/crt0.o $tmpdir/client.o -L$tmpdir -ldll $MYLIBS" ] {
		pass $msg
	    } else {
		fail $msg 
	    }

	    # Check linking with symlinked dll.
	    set msg "linking auto-import client using symbolic linked dll"
	    if [ld_special_link $ld $tmpdir/clientimport.exe "--enable-auto-import /lib/crt0.o $tmpdir/client.o -L$tmpdir -lsymlinked_dll $MYLIBS" ] {
		pass $msg
	    }	else {
		fail $msg 
	    }

	    # Check linking with disabled auto-import, this must produce linking error.
	    set msg "linking with disabled auto-import"
	    if ![ld_special_link $ld $tmpdir/clientimport.exe "--disable-auto-import /lib/crt0.o $tmpdir/client.o -L$tmpdir -ldll $MYLIBS" ] {
		pass $msg
	    }	else {
		fail $msg
	    }
	}
    }
}

if [istarget *-pc-mingw*] {
    unsupported "mingw currently not supported"
}