PATCH mingw32 MD_STARTFILE_PREFIX was a bad idea.

["Aaron W. LaFramboise" <aaronraolete36 at aaronwl dot com>]

A year ago, I asked that MD_STARTFILE_PREFIX be defined for mingw32 to 
enable GCC to be installed in any directory.  Mingw32 does not have a 
/lib, so the usual GCC searches don't work. 
http://gcc.gnu.org/ml/gcc-patches/2003-05/msg02015.html

In that time, this patch has been a continuing source of bug reports and 
subtle problems.

With the MD_STARTFILE_PREFIX macro defined to /mingw/lib, a search path 
like this results:
$PREFIX/bin/gcc/mingw32/version
$PREFIX/bin/gcc
$PREFIX/lib/gcc/mingw32/version
$PREFIX/mingw32/lib
/mingw/lib
$PREFIX/lib

Since /mingw/lib is searched before $PREFIX/lib, this often causes the 
wrong versions of gcc libraries, such as libstdc++-v3, to be linked 
against.  While this is not the behavior the documentation seemed to 
indicate to me*, it seems to be the intended behavior, according to a 
comment in config/i386/sco5.h**.

* "MD_STARTFILE_PREFIX If defined, this macro supplies an additional 
prefix to try after the standard prefixes. MD_EXEC_PREFIX is not 
searched when the -b option is used, or when the compiler is built as a 
cross compiler."

** ". . . We get /usr/gnu/lib first by virtue of the MD_STARTFILE_PREFIX 
below."

As near as I can tell, the only way to fix this is to remove this macro 
and give up being able to install a mingw GCC to any directory.  This 
means having to install the libc (mingw runtime or otherwise) into any 
directory you'd like to install GCC into before you build GCC.

Aaron W. LaFramboise

2004-06-10  Aaron W. LaFramboise <aaronraolete36@aaronwl.com>

	* config/i386/mingw32.h (MD_STARTFILE_PREFIX): Remove.

Index: gcc/gcc/config/i386/mingw32.h
===================================================================
RCS file: /cvsroot/gcc/gcc/gcc/config/i386/mingw32.h,v
retrieving revision 1.35
diff -c -3 -p -r1.35 mingw32.h
*** gcc/gcc/config/i386/mingw32.h	26 Sep 2003 03:46:06 -0000	1.35
--- gcc/gcc/config/i386/mingw32.h	8 Jun 2004 05:59:01 -0000
*************** Boston, MA 02111-1307, USA.  */
*** 69,78 ****
  #define STARTFILE_SPEC "%{shared|mdll:dllcrt2%O%s} \
    %{!shared:%{!mdll:crt2%O%s}} %{pg:gcrt2%O%s}"

- /* An additional prefix to try after the standard prefixes.  */
- #undef MD_STARTFILE_PREFIX
- #define MD_STARTFILE_PREFIX "/mingw/lib/"
-
  /* Output STRING, a string representing a filename, to FILE.
     We canonicalize it to be in Unix format (backslashes are replaced
     forward slashes.  */
--- 69,74 ----