Script errors in libtool on Darwin

[Timothy J. Wood]

  I'm trying to build a GCC 3.1 cross compiler (from the head of GCC 
CVS) from Mac OS X 10.1.2 to Win32 (MinGW).  When I do so, get get 
errors from the libtool script for the objc runtime (which I need).  
This occurs whether I enable shared libraries or not (the erroring 
section seems to be related to shared library support).

  The offending code starts with:

archive_expsym_cmds="if test \\"x\\`head -1 \$export_symbols\\`\\" = 
xEXPORTS; then
        cp \$export_symbols \$output_objdir/\$soname-def;
      else
        echo EXPORTS > \$output_objdir/\$soname-def;
...


  On Darwin I get:

./libtool --mode=compile 
/Users/Shared/bungi/Build/Intermediates/MinGW/builds/gcc/gcc/xgcc 
-B/Users/Shared/bungi/Build/Intermediates/MinGW/builds/gcc/gcc/ 
-B/Users/Shared/bungi/Build/MinGW/i386-mingw32msvc/bin/ 
-B/Users/Shared/bungi/Build/MinGW/i386-mingw32msvc/lib/ -isystem 
/Users/Shared/bungi/Build/MinGW/i386-mingw32msvc/include -c -I. 
-I/Users/Shared/bungi/Source/GNU/gcc/gcc/libobjc   -g  -DIN_GCC 
-DIN_TARGET_LIBS -I/Users/Shared/bungi/Source/GNU/gcc/gcc/libobjc/objc  
-I/Users/Shared/bungi/Source/GNU/gcc/gcc/libobjc/../gcc 
-I/Users/Shared/bungi/Source/GNU/gcc/gcc/libobjc/../gcc/config 
-I../../gcc -I/Users/Shared/bungi/Source/GNU/gcc/gcc/libobjc/../include 
/Users/Shared/bungi/Source/GNU/gcc/gcc/libobjc/archive.c
head: : No such file or directory
./libtool: command not found: \[$]2 [214]
./libtool: no such file or directory: \ >> $output_objdir/$soname-
def;;\n           *) echo \ [215]
expr: non-numeric argument
... lots more errors ...

  This looks like the 'head' command is being executed by /bin/sh even 
though it is being quoted.  So, I installed the latest bash and 
modified  the libtool script above to use that bash executable.  In this 
case I get a different error (complaining about unexpected end of input) 
but I still get errors.

  Is this a known bug?  Any suggestions would be helpful.

  Thanks!

-tim